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  Subjects -> PHYSICS (Total: 804 journals)
    - ELECTRICITY AND MAGNETISM (9 journals)
    - MECHANICS (20 journals)
    - NUCLEAR PHYSICS (49 journals)
    - OPTICS (89 journals)
    - PHYSICS (584 journals)
    - SOUND (22 journals)
    - THERMODYNAMICS (31 journals)

PHYSICS (584 journals)            First | 1 2 3 | Last

Showing 201 - 400 of 741 Journals sorted alphabetically
International Journal of Medical Physics, Clinical Engineering and Radiation Oncology     Open Access   (Followers: 5)
International Journal of Micro-Nano Scale Transport     Full-text available via subscription   (Followers: 1)
International Journal of Microstructure and Materials Properties     Hybrid Journal   (Followers: 7)
International Journal of Microwave Science and Technology     Open Access   (Followers: 4)
International Journal of Modeling, Simulation, and Scientific Computing     Hybrid Journal   (Followers: 1)
International Journal of Modern Physics A     Hybrid Journal   (Followers: 1)
International Journal of Modern Physics B     Hybrid Journal   (Followers: 1)
International Journal of Modern Physics C     Hybrid Journal   (Followers: 1)
International Journal of Modern Physics D     Hybrid Journal   (Followers: 1)
International Journal of Modern Physics E     Hybrid Journal   (Followers: 3)
International Journal of Nanomanufacturing     Hybrid Journal  
International Journal of Nanoscience     Hybrid Journal   (Followers: 2)
International Journal of Nanotechnology     Hybrid Journal   (Followers: 4)
International Journal of Non-Linear Mechanics     Hybrid Journal   (Followers: 6)
International Journal of Physical Sciences     Open Access  
International Journal of Physics     Open Access  
International Journal of PIXE     Hybrid Journal   (Followers: 1)
International Journal of Plasticity     Hybrid Journal   (Followers: 6)
International Journal of Quantum Information     Hybrid Journal   (Followers: 2)
International Journal of Self-Propagating High-Temperature Synthesis     Hybrid Journal   (Followers: 2)
International Journal of Solids and Structures     Hybrid Journal   (Followers: 14)
International Journal of Surface Science and Engineering     Hybrid Journal   (Followers: 7)
International Journal of Theoretical and Applied Multiscale Mechanics     Hybrid Journal   (Followers: 2)
International Journal of Theoretical and Mathematical Physics     Open Access   (Followers: 1)
International Journal of Theoretical Physics     Hybrid Journal   (Followers: 2)
International Journal of Thermal Sciences     Hybrid Journal   (Followers: 10)
International Letters of Chemistry, Physics and Astronomy     Open Access   (Followers: 3)
International Materials Reviews     Hybrid Journal   (Followers: 12)
Inverse Problems     Hybrid Journal   (Followers: 2)
IOP Conference Series: Materials Science and Engineering     Open Access   (Followers: 5)
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 5)
Izvestiya Atmospheric and Oceanic Physics     Hybrid Journal   (Followers: 3)
Izvestiya, Physics of the Solid Earth     Hybrid Journal   (Followers: 2)
Japanese Journal of Applied Physics     Full-text available via subscription   (Followers: 3)
JCP : BioChemical Physics     Hybrid Journal   (Followers: 1)
JETP Letters     Hybrid Journal   (Followers: 2)
Journal of Adhesion Science and Technology     Hybrid Journal   (Followers: 7)
Journal of Advanced Physics     Full-text available via subscription  
Journal of Advances in Physics     Open Access   (Followers: 6)
Journal of Applied Mathematics and Mechanics     Full-text available via subscription   (Followers: 5)
Journal of Applied Mathematics and Physics     Open Access  
Journal of Applied Mechanics and Technical Physics     Hybrid Journal   (Followers: 3)
Journal of Applied Physics     Hybrid Journal   (Followers: 77)
Journal of Applied Remote Sensing     Hybrid Journal   (Followers: 36)
Journal of Applied Spectroscopy     Hybrid Journal   (Followers: 9)
Journal of Astrophysics     Open Access   (Followers: 2)
Journal of Astrophysics and Astronomy     Open Access   (Followers: 17)
Journal of Basic and Applied Physics     Open Access   (Followers: 2)
Journal of Building Physics     Hybrid Journal   (Followers: 1)
Journal of Chromatographic Science     Hybrid Journal   (Followers: 19)
Journal of Complex Networks     Hybrid Journal   (Followers: 1)
Journal of Composite Materials     Hybrid Journal   (Followers: 225)
Journal of Computational Methods in Physics     Open Access  
Journal of Computational Physics     Hybrid Journal   (Followers: 53)
Journal of Contemporary Physics (Armenian Academy of Sciences)     Hybrid Journal   (Followers: 1)
Journal of Dynamic Systems, Measurement, and Control     Full-text available via subscription   (Followers: 11)
Journal of Elasticity     Hybrid Journal   (Followers: 5)
Journal of Electrical Bioimpedance     Full-text available via subscription   (Followers: 2)
Journal of Electron Spectroscopy and Related Phenomena     Hybrid Journal   (Followers: 3)
Journal of Electronic Materials     Hybrid Journal   (Followers: 2)
Journal of Electronics Cooling and Thermal Control     Open Access   (Followers: 3)
Journal of Engineering Materials and Technology     Full-text available via subscription   (Followers: 15)
Journal of Engineering Physics and Thermophysics     Hybrid Journal   (Followers: 1)
Journal of Experimental and Theoretical Physics     Hybrid Journal   (Followers: 2)
Journal of Fire Sciences     Hybrid Journal   (Followers: 4)
Journal of Geometry and Physics     Full-text available via subscription  
Journal of Geophysical Research : Space Physics     Full-text available via subscription   (Followers: 29)
Journal of Gravity     Open Access  
Journal of High Energy Astrophysics     Full-text available via subscription   (Followers: 1)
Journal of High Energy Physics     Hybrid Journal   (Followers: 4)
Journal of Hydrogels     Full-text available via subscription  
Journal of Hyperspectral Remote Sensing     Open Access   (Followers: 14)
Journal of Imaging     Open Access   (Followers: 2)
Journal of Information Display     Hybrid Journal  
Journal of Intelligent Material Systems and Structures     Hybrid Journal   (Followers: 3)
Journal of Lightwave Technology     Hybrid Journal   (Followers: 5)
Journal of Low Frequency Noise, Vibration and Active Control     Full-text available via subscription   (Followers: 6)
Journal of Luminescence     Hybrid Journal   (Followers: 3)
Journal of Materials Engineering and Performance     Hybrid Journal   (Followers: 24)
Journal of Materials Physics and Chemistry     Open Access   (Followers: 1)
Journal of Materials Science     Hybrid Journal   (Followers: 18)
Journal of Materials Science : Materials in Electronics     Hybrid Journal   (Followers: 3)
Journal of Materials Science : Materials in Medicine     Hybrid Journal   (Followers: 4)
Journal of Mathematical Fluid Mechanics     Hybrid Journal   (Followers: 5)
Journal of Mathematical Physics     Hybrid Journal   (Followers: 3)
Journal of Medical Imaging and Health Informatics     Full-text available via subscription  
Journal of Medical Ultrasonics     Hybrid Journal   (Followers: 2)
Journal of Micro/Nanolithography MEMS and MOEMS     Hybrid Journal   (Followers: 7)
Journal of Modern Physics     Open Access   (Followers: 2)
Journal of Molecular Spectroscopy     Hybrid Journal   (Followers: 8)
Journal of Motor Behavior     Hybrid Journal   (Followers: 10)
Journal of Multiscale Modeling     Hybrid Journal  
Journal of Nanophotonics     Hybrid Journal   (Followers: 3)
Journal of Nepal Physical Society     Open Access  
Journal of Nondestructive Evaluation     Hybrid Journal   (Followers: 7)
Journal of Nonlinear Dynamics     Open Access  
Journal of Nonlinear Mathematical Physics     Hybrid Journal   (Followers: 1)
Journal of Nuclear Physics, Material Sciences, Radiation and Applications     Open Access  
Journal of Optics     Hybrid Journal   (Followers: 4)
Journal of Physical and Chemical Reference Data     Hybrid Journal   (Followers: 4)
Journal of Physical Chemistry B     Full-text available via subscription   (Followers: 36)
Journal of Physical Chemistry C     Full-text available via subscription   (Followers: 27)
Journal of Physical Oceanography     Full-text available via subscription   (Followers: 9)
Journal of Physical Organic Chemistry     Hybrid Journal   (Followers: 7)
Journal of Physics A : Mathematical and Theoretical     Hybrid Journal   (Followers: 5)
Journal of Physics and Chemistry of Solids     Hybrid Journal   (Followers: 5)
Journal of Physics D : Applied Physics     Hybrid Journal   (Followers: 9)
Journal of Physics: Condensed Matter     Hybrid Journal   (Followers: 7)
Journal of Physics: Conference Series     Open Access   (Followers: 2)
Journal of Plasma Physics     Hybrid Journal   (Followers: 5)
Journal of Polymer Science Part B: Polymer Physics     Hybrid Journal   (Followers: 23)
Journal of Porous Materials     Hybrid Journal   (Followers: 3)
Journal of Porphyrins and Phthalocyanines     Hybrid Journal   (Followers: 1)
Journal of Quantitative Spectroscopy and Radiative Transfer     Hybrid Journal   (Followers: 1)
Journal of Reinforced Plastics and Composites     Hybrid Journal   (Followers: 30)
Journal of Research in Physics     Open Access  
Journal of Rheology     Full-text available via subscription   (Followers: 4)
Journal of Romance Studies     Full-text available via subscription   (Followers: 2)
Journal of Sandwich Structures and Materials     Hybrid Journal   (Followers: 2)
Journal of Scientific Research     Open Access   (Followers: 1)
Journal of Semiconductors     Full-text available via subscription   (Followers: 2)
Journal of Sensors     Open Access   (Followers: 15)
Journal of Sol-Gel Science and Technology     Hybrid Journal  
Journal of Solid State Lighting     Open Access  
Journal of Solid State Physics     Open Access   (Followers: 1)
Journal of Spectroscopy     Open Access   (Followers: 7)
Journal of Superconductivity and Novel Magnetism     Partially Free  
Journal of Synchrotron Radiation     Hybrid Journal   (Followers: 3)
Journal of Testing and Evaluation     Full-text available via subscription   (Followers: 19)
Journal of the American Society for Mass Spectrometry     Hybrid Journal   (Followers: 22)
Journal of the Brazilian Society of Mechanical Sciences     Open Access   (Followers: 2)
Journal of the ICRU     Hybrid Journal  
Journal of the Korean Physical Society     Partially Free  
Journal of Theoretical and Applied Physics     Open Access   (Followers: 1)
Journal of Tissue Engineering     Open Access   (Followers: 6)
Journal of Ultrasound in Medicine     Full-text available via subscription   (Followers: 7)
Journal of Vibration and Control     Hybrid Journal   (Followers: 36)
Journal of Visualization     Hybrid Journal   (Followers: 2)
Journal of Zhejiang University SCIENCE A     Hybrid Journal  
Jurnal Fisika     Open Access  
Jurnal NEUTRINO     Open Access  
Jurnal Pendidikan Fisika Indonesia (Indonesian Journal of Physics Education)     Open Access  
Jurnal Penelitian Fisika dan Aplikasinya     Open Access  
Jurnal Penelitian Sains (JPS)     Open Access  
Karbala International Journal of Modern Science     Open Access   (Followers: 2)
Lasers in Surgery and Medicine     Hybrid Journal   (Followers: 1)
Latvian Journal of Physics and Technical Sciences     Open Access  
Learning Technologies, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Les Houches Summer School Proceedings     Full-text available via subscription   (Followers: 1)
Letters in Mathematical Physics     Hybrid Journal   (Followers: 2)
Light : Science & Applications     Open Access  
Living Reviews in Relativity     Open Access  
Living Reviews in Solar Physics     Open Access   (Followers: 1)
Lubrication Science     Hybrid Journal   (Followers: 1)
Macalester Journal of Physics and Astronomy     Open Access   (Followers: 2)
Machining Science and Technology: An International Journal     Hybrid Journal   (Followers: 3)
Magnetic Resonance Materials in Physics, Biology and Medicine     Hybrid Journal   (Followers: 2)
Magnetics Letters, IEEE     Hybrid Journal   (Followers: 5)
MAPAN     Hybrid Journal  
Mass Spectrometry Reviews     Hybrid Journal   (Followers: 28)
Matéria (Rio de Janeiro)     Open Access   (Followers: 1)
Materials & Design     Hybrid Journal   (Followers: 39)
Materials at High Temperatures     Full-text available via subscription   (Followers: 4)
Materials Chemistry and Physics     Full-text available via subscription   (Followers: 14)
Materials Research     Open Access   (Followers: 8)
Materials Research Bulletin     Hybrid Journal   (Followers: 22)
Materials Research Innovations     Hybrid Journal   (Followers: 1)
Materials Science     Hybrid Journal   (Followers: 8)
Materials Science and Engineering: A     Hybrid Journal   (Followers: 41)
Materials Science and Engineering: B     Hybrid Journal   (Followers: 19)
Materials Science and Engineering: C     Hybrid Journal   (Followers: 19)
Materials Science and Engineering: R: Reports     Hybrid Journal   (Followers: 16)
Materials Science and Technology     Hybrid Journal   (Followers: 41)
Matériaux & Techniques     Full-text available via subscription   (Followers: 2)
Mathematical Physics, Analysis and Geometry     Hybrid Journal   (Followers: 1)
Mathematics and Mechanics of Solids     Hybrid Journal   (Followers: 2)
Matter and Radiation at Extremes     Full-text available via subscription  
Meccanica     Hybrid Journal  
Mechanics of Advanced Materials and Structures     Hybrid Journal   (Followers: 3)
Mechanics of Materials     Hybrid Journal   (Followers: 19)
Mechanics of Time-Dependent Materials     Hybrid Journal   (Followers: 1)
Mechanics Research Communications     Hybrid Journal   (Followers: 2)
Metamaterials     Hybrid Journal   (Followers: 2)
Micro and Nano Systems Letters     Open Access   (Followers: 4)
Microfluidics and Nanofluidics     Hybrid Journal   (Followers: 10)
Microporous and Mesoporous Materials     Hybrid Journal   (Followers: 6)
Modern Instrumentation     Open Access   (Followers: 20)
Modern Physics Letters A     Hybrid Journal  
Modern Physics Letters B     Hybrid Journal   (Followers: 1)
Molecular Diversity     Hybrid Journal  
Moscow University Physics Bulletin     Hybrid Journal  
Multibody System Dynamics     Hybrid Journal   (Followers: 1)
NANO     Hybrid Journal   (Followers: 6)
Nano Letters     Full-text available via subscription   (Followers: 57)
Nano Reviews & Experiments     Open Access   (Followers: 12)
Nano-Micro Letters     Open Access   (Followers: 1)
NanoBioImaging     Open Access  
Nanomechanics     Open Access  
Nanoscale and Microscale Thermophysical Engineering     Hybrid Journal   (Followers: 3)
Nanoscale Research Letters     Open Access   (Followers: 3)

  First | 1 2 3 | Last

Journal Cover Contributions to Plasma Physics
  [SJR: 0.717]   [H-I: 31]   [2 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0863-1042 - ISSN (Online) 1521-3986
   Published by John Wiley and Sons Homepage  [1598 journals]
  • Analyzing Quantum Correlations Made Simple
    • Authors: T. Dornheim; H. Thomsen, P. Ludwig, A. Filinov, M. Bonitz
      Abstract: The understanding of correlations in degenerate nonideal many‐particle systems is complex and theoretically challenging. Using the recently proposed permutation blocking path integral Monte Carlo (PB‐PIMC) scheme, which allows for an exact treatment of many‐body correlations, we study the influence of quantum statistics in a confined few‐particle Coulomb (quantum dot) system. As a versatile tool to gain insight into the internal structure of correlated many‐body systems, the application of triple correlation functions is extended to quantum systems. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2016-05-13T06:30:11.712041-05:
      DOI: 10.1002/ctpp.201500120
       
  • Effective Potentials for Charge‐Helium and
           Charge‐Singly‐Ionized Helium Interactions in a Dense Plasma
    • Authors: T. S. Ramazanov; S. M. Amirov, Zh. A. Moldabekov
      Abstract: The effective electron (proton)‐He and electron (proton)‐He+ screened pair interaction potentials arising as a result of partial screening of the helium nucleus field by bound electrons, taking into account both screening by free charged particles and quantum diffraction effect in dense plasmas were derived. The impact of quantum effects on screening was analyzed. It was shown that plasma polarization around the atom leads to the additional repulsion (attraction) between the electron (proton) and the helium atom. The method of constructing the full electron (proton)‐He and electron (proton)‐He+ screened pair interaction potentials as the sum of the derived potentials with the polarization potential and exchange potential is discussed. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2016-05-13T06:30:10.75909-05:0
      DOI: 10.1002/ctpp.201500130
       
  • Charge and Mass Measurements of a Dust Particle in the Linear Quadrupole
           Trap
    • Authors: R. A. Syrovatka; L. V. Deputatova, V. S. Fiinov, D. S. Lapitsky, V. Ya. Pecherkin, L. M. Vasiyak, V. I. Vladimirov
      Abstract: The method of charge and mass measurements of a dust particle in the linear quadrupole trap has been developed. The method uses the free fall velocity of the particle for mass measurements and uses combination of the electric and gravitational fields to obtain particle charge. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2016-05-13T06:30:09.798993-05:
      DOI: 10.1002/ctpp.201500131
       
  • Features of Phase Transitions in Models of Complex Plasma
    • Authors: I. A. Martynova; I. L. Iosilevskiy
      Abstract: Some features of melting curves and fluid‐crystal phase transitions in complex plasmas are under discussion. The base for a consideration is the well‐known phase diagram of dusty plasma (Hamaguchi, 1997) for an equilibrium charged system with the Yukawa potential in Γ − κ plane (Γ is the Coulomb non‐ideality parameter,κ is a screening parameter). This phase diagram is converted for a one‐component Yukawa system in ordinary density ‐ temperature plane. A melting curve is converted for this system in temperature ‐ pressure plane. There are some density gap estimations based on a hypothesis of similar melting properties in Yukawa systems and Soft Spheres systems. The initial phase diagram is also converted for two one‐temperature models of complex plasmas in density – temperature plane. Here simplified variants of complex plasmas models are considered as a thermodynamically equilibrium ensemble of classical Coulomb particles: a 2‐component electroneutral system of macro‐ and microions (+Z, −1) and a 3‐component electroneutral mixture of macroions and two kinds of microions (+Z, −1, +1). The resulting phase diagram for (+Z,−1) or (−Z,+1) in ln n − ln T plane has a form of a linear combination of crystalline and fluid zones separated by the boundaries Γ = const. Parameters and locations of these zones are analyzed in dependence on macroion charge number Z. There are huge negative pressure and negative compressibility areas in the initial phase diagram if one uses equations of state (Hamaguchi,1997) and (Khrapak, 2014). Thus, questions of thermodynamic stability and an existence of an additional phase transition gas‐liquid are discussed. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2016-05-13T06:30:08.911429-05:
      DOI: 10.1002/ctpp.201500135
       
  • Reflecting Boundary Conditions for Classical and Quantum Molecular
           Dynamics Simulations of Nonideal Plasmas
    • Authors: Y. S. Lavrinenko; I.V. Morozov, I. A. Valuev
      Abstract: The influence of boundary conditions for the classical and wave packet molecular dynamics (MD) simulations of nonideal electron‐ion plasma is studied. We start with the classical MD and perform a comprehensive study of convergence of the per‐particle potential energy and pressure with the number of particles using both the nearest image method (periodic boundaries) and harmonic reflective boundaries. As a result an error caused by finiteness of the simulation box is estimated. Moreover electron oscillations given by the spectra of the current autocorrelation function are analyzed for both types of the boundary conditions. A special attention is paid to the reflecting boundaries since they prevent wave packet spreading in the Wave Packet MD. To speed up classical MD simulations we use the GPU‐accelerated code
      PubDate: 2016-05-13T06:30:07.845225-05:
      DOI: 10.1002/ctpp.201500139
       
  • Optical Reflectivity of Xenon Plasma Revisited
    • Abstract: Newly obtained experimental data for the reflectivity of Xenon plasmas at pressures of 10‐12 GPa at large incident angles are analyzed. Using a Fermi‐like density profile along the shock wave front, the reflectivity coefficients for the s and p ‐ polarized waves were calculated. The influence of atoms which were taken into account at the level of collision frequency unique density prove to be crucial for the understanding of the reflection process. Subsequently, as physically expected, a profile is sufficient to obtain good agreement with the experimental data at all investigated optical laser frequencies. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2016-05-13T06:30:06.84857-05:0
      DOI: 10.1002/ctpp.201500144
       
  • Monte Carlo Simulation of Partially Ionized Hydrogen Plasmas
    • Authors: C. Cordes; Th. Bornath, R. Redmer
      Abstract: A Monte Carlo code has been developed for the interaction of initially neutral systems with intense ultra‐short laser pulses. Photoionization creates immediately a partially ionized, non‐equilibrium plasma for which the relevant scattering processes are included. In this way the absorption of the laser energy in the plasma and the evolution of the non‐equilibrium electron distribution function during the laser pulse is described. Furthermore, the relaxation into an equilibrium state can be studied for longer time scales. As an example we consider the interaction of a cold liquid hydrogen jet with intense, ultra‐short free electron laser pulses in the extreme ultraviolet spectral range. The corresponding spectrum of the Thomson self‐scattering is calculated using the non‐equilibrium electron distribution functions extracted from the Monte Carlo simulations. We compare with benchmarking experiments performed at the free electron laser facility FLASH. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2016-05-13T06:30:05.633828-05:
      DOI: 10.1002/ctpp.201600005
       
  • Polarization of a Dust Particle and Surrounded Plasma in an External
           Electric Field
    • Authors: G. I. Sukhinin; A. V. Fedoseev, M. V. Salnikov
      Abstract: Numerical investigations of different properties of the system of a dust particle and ion cloud are presented. The model is based on the solution of Newton equations for ion trajectories with Monte‐Carlo simulations for the ions initial position, velocity distribution, and mean three path. The calculations of the ion density distribution around a single dust particle were made taking into account the presence of an external electric field. The dust particle charge was calculated self‐consistently taking into account the ion and the electron fluxes towards the dust particle. A two‐dimensional spatial distribution of the electric potential was found in the assumption of weak spatial anisotropy for the case of a small external electric field. The dipole moment and polarization coefficient of the system of “dust particle ‐ ion cloud” was obtained for different values of the ions mean free path and the external electric field. The results showed that the polarization of such a system is significant, it influences the interaction between different dust particles and should be taken into account. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2016-02-24T06:30:16.008267-05:
      DOI: 10.1002/ctpp.201500128
       
  • Effect of Dipole‐Dipole Interaction on the Compressional
           Oscillations in Two‐Dimensional Yukawa liquids
    • Authors: T. S. Ramazanov; A. Zh. Gabdulin, Zh. A. Moldabekov
      Abstract: The paper presents the study of oscillations in the two‐dimensional Yukawa liquids where the interparticle interaction potential in addition to the Yukawa term has the dipole‐dipole interaction term. The frequency of longitudinal oscillations was studied using the Fourier transform of the velocity autocorrelation function. It was found that in the two‐dimensional Yukawa liquids the longitudinal oscillation frequency of particles becomes sensitive to variations in the coupling parameter if even weak additional dipole‐dipole interaction between particles exists. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2016-02-24T06:30:15.28937-05:0
      DOI: 10.1002/ctpp.201500125
       
  • Electrostatic Interaction of Two Point Charges in Equilibrium Plasmas
           within the Debye Approximation
    • Authors: Anatoly V. Filippov
      Abstract: The influence of the outer boundary shape on the electrostatic interaction of two charged point macroparticles in an equilibrium plasma is studied within the Debye‐Hückel approximation, i.e., based on the linearized Poisson‐Boltzmann model. It is shown that the boundary shape has a strong influence on the electrostatic interaction between two macroparticles, which switches from repulsion at small interparticle distances to attraction as it approaches the half‐length of the computational cell. It is found that in the case of dust particles arranged in the nodes of a simple cubic lattice, the electrostatic force acting on them is equal to zero; hence, an infinite simple cubic lattice of charged dust particles is mechanically stable. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2016-02-24T06:30:14.374701-05:
      DOI: 10.1002/ctpp.201500122
       
  • Notes on Anomalous Quantum Wake Effects
    • Authors: Zh. A. Moldabekov; P. Ludwig, M. Bonitz, T. S. Ramazanov
      Abstract: The ion potential in the warm dense matter regime exhibits wake effects due to streaming degenerate electrons and has been discussed previously [Phys. Rev. E 91, 023102 (2015)]. Here, we extend the analysis with particular focus on anomalous wake effects that is (i) the collision‐induced wake amplification, and (ii) the non‐monotonic temperature dependence of the wake amplitude. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2016-02-24T06:30:07.216646-05:
      DOI: 10.1002/ctpp.201500137
       
  • Kinetic Modelling of the Plasma Recombination
    • Abstract: Implementation of self‐consistent model of plasma recombination into the BIT1 PIC code and the simulation of detached SOL plasma are described. Our simulations indicate that in a strongly recombining plasma edge the sheath properties do not change qualitatively. The most affected parameter is the sheath heat transmission coefficient, which can increase by order of magnitude.
       
  • Gyrokinetic Theory and Dynamics of the Tokamak Edge
    • Abstract: The validity of modern gyrokinetic field theory is assessed for the tokamak edge. The basic structure of the Lagrangian and resulting equations and their conservation laws is reviewed. The conventional microturbulence ordering for expansion is small potential/arbitrary wavelength. The equilibrium ordering for expansion is long wavelength/arbitrary amplitude. The long‐wavelength form of the conventional Lagrangian is derived in detail. The two Lagrangians are shown to match at long wavelength if the E × B Mach number is small enough for its corrections to the gyroaveraging to be neglected. Therefore, the conventional derivation and its Lagrangian can be used at all wavelengths if these conditions are satisfied. Additionally, dynamical compressibility of the magnetic field can be neglected if the plasma beta is small. This allows general use of a shear‐Alfvén Lagrangian for edge turbulence and self consistent equilibrium‐scale phenomena for flows, currents, and heat fluxes for conventional tokamaks without further modification by higher‐order terms. Corrections in polarisation and toroidal angular momentum transport due to these higher‐order terms for global edge turbulence computations are shown to be small. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Fluid Neutral Model for Use in Hybrid Neutral Simulations of a Detached
           Case
    • Abstract: Two fluid neutral models are compared with a finite volume solution of the kinetic neutral equation for a simplified 1D detached case. The neutral equations are coupled to the plasma equations. The first fluid neutral model assumes that neutral and ion temperature are equal while the second adds a separate neutral energy equation. It is illustrated that both the AMJUEL‐HYDHEL databases and TRIM code can be incorporated. The first model is already accurate giving a maximum relative error of 10% for the target fluxes. Adding an energy equation further decreases this maximum relative error to 5%.
       
  • Core‐SOL Modelling of Neon Seeded JET Discharges with the
           ITER‐like Wall
    • Abstract: Five ELMy H‐mode Ne seeded JET pulses have been simulated with the self‐consistent core‐SOL model COREDIV. In this five pulse series only the Ne seeding rate was changed shot by shot, allowing a thorough study of the effect of Ne seeding on the total radiated power and of its distribution between core and SOL tobe made. The increase in the simulations of the Ne seeding rate level above that achieved in experiments shows saturation of the total radiated power at a relatively low radiated‐heating power ratio (frad = 0.60) and a further increase of the ratio of SOL to core radiation, in agreement with the reduction of W release at high Ne seeding level. In spite of the uncertainties caused by the simplified SOL model of COREDIV (neutral model, absence of ELMs and slab model for the SOL), the increase of the perpendicular transport in the SOL with increasing Ne seeding rate, which allows to reproduce numerically the experimental distribution core‐SOL of the radiated power, appears to be of general applicability.
       
  • Modelling of Impurity Transport and Plasma–Wall Interaction in
           Fusion Devices with the ERO Code: Basics of the Code and Examples of
           Application
    • Abstract: The 3D ERO code, which simulates plasma–wall interaction and impurity transport in magnetically confined fusion‐relevant devices is described. As application, prompt deposition of eroded tungsten has been simulated at surfaces with shallow magnetic field of 3 T. Dedicated PIC simulations have been performed to calculate the characteristics of the sheath in front of plasma–exposed surfaces to use as input for these ERO simulations. Prompt deposition of tungsten reaches 100% at the highest electron temperature and density. In comparison to more simplified assumptions for the sheath the amount of prompt deposition is in general smaller if the PIC–calculated sheath is used. Due to friction with the background plasma the impact energy of deposited tungsten can be significantly larger than the energy gained in the sheath potential.
       
  • Hybrid Formulation of Radiation Transport in Optically Thick Divertor
           Plasmas
    • Abstract: Kinetic Monte Carlo simulations of coupled atom‐radiation transport in optically thick divertor plasmas can be computationally very demanding, in particular in ITER relevant conditions or even larger devices, e.g. for power plant divertor studies. At high (∼ 1015 cm–3) atomic densities, it can be shown that sufficiently large divertors behave in certain areas like a black body near the first resonance line of hydrogen (Lyman α). This suggests that, at least in part, the use of continuum model (radiation hydrodynamics) can be sufficiently accurate, while being less time consuming. In this work, we report on the development of a hybrid model devoted to switch automatically between a kinetic and a continuum description according to the plasma conditions. Calculations of the photo‐excitation rate in a homogeneous slab are performed as an illustration. The outlined hybrid concept might be also applicable to neutral atom transport, due to mathematical analogy of transport equations for neutrals and radiation.
       
  • TECXY Study of a Liquid Lithium Divertor for DEMO
    • Abstract: Divertor targets made out of a capillary porous system (CPS) filled with liquid lithium, have been proposed as an alternative to standard, solid state plates. In the current work we simulate the DEMO edge plasma in either a standard single‐null or snowflake divertor configuration. Our tool is the 2D code TECXY. Lithium ablated from the target plate surface and released into the plasma is shown here to partially screen the incoming heat flux. Lithium's moderate SOL radiation levels suggest additional seeding to be beneficial. Very high heat fluxes to the divertor need to be avoided, as intensive lithium evaporation might unacceptably pollute the plasma.
       
  • Accuracy and Convergence of Coupled Finite‐Volume /
           Monte‐Carlo Codes for Plasma Edge Simulations
    • Abstract: Present computational techniques for coupled finite‐volume/Monte‐Carlo codes for plasma edge modeling under ITER or DEMO conditions face serious challenges with respect to computational time and accuracy. In this paper, scaling laws for different error contributions are assessed and practical procedures for error estimation are proposed. First results on a 1D and a 2D test case are discussed.
       
  • Effect of Statistical Noise on Simulation Results with a Plasma Fluid Code
           Coupled to a Monte Carlo Kinetic Neutral Code
    • Abstract: Power exhaust is one of the major challenges that future devices such as ITER and DEMO will face. Because of the lack of identified scaling parameters, predictions for divertor plasma conditions in these devices have to rely on detailed modelling. Most plasma edge simulations carried out so far rely on transport codes, which most of the times consist of a fluid code for the plasma coupled to a kinetic Monte Carlo (MC) code for neutral particles. One of the main difficulties in interpreting code results is the statistical noise from the MC procedure, which makes it difficult to define a convergence criterion for the simulations. In this work, we elaborate on similarities between noisy transport code simulations and turbulence simulations, and argue that the time averaged solution is a well defined stationary solution for the system. We illustrate these ideas with a simple slab test case with fluid neutrals, to which we add synthetic noise. In this case, the effects of noise are found to be significant only at high noise levels and for large enough correlations times.
       
  • Modelling of the JET DT Experiments in Carbon and ITER‐like Wall
           Configurations
    • Abstract: In this paper numerical simulations with the self‐consistent COREDIV code of the planned JET DT experiments have been performed. First, record shot from the 1997 experiments was simulated and good agreement with experimental data has been found. Direct extrapolation of the carbon wall results to the new ILW configuration (discharge parameters as for the shot #42746) shows very good core plasma performance with even higher fusion power but with too large power to the divertor. However, with the neon seeding the heat load and plate temperatures can be efficiently reduced keeping good the plasma performance. Investigations have been done also for the planned DT operation scenario based on a conventional ELMy H‐mode at high plasma current and magnetic field. Simulations for the reference ELMy H‐mode shot #87412 show good agreement with the experimental data but the direct extrapolation of the DD results to deuterium‐tritium operation shows relatively poor performance in terms of the achieved fusion power. The situation improves, if the highest heating power is assumed (41 MW) and fusion powers in the excess of 12 MW can be achieved. All the high performance shots require the heat load control by neon seeding which shows rather beneficial effect on the plasma performance allowing for relatively wide operational window in terms of the amount of the allowed neon influx.
       
  • Impurity Seeding in ASDEX Upgrade Tokamak Modeled by COREDIV Code
    • Abstract: The self‐consistent COREDIV code is used to simulate discharges in a tokamak plasma, especially the influence of impurities during nitrogen and argon seeding on the key plasma parameters. The calculations are performed with and without taking into account the W prompt redeposition in the divertor area and are compared to the experimental results acquired on ASDEX Upgrade tokamak (shots #29254 and #29257). For both impurities the modeling shows a better agreement with the experiment in the case without prompt redeposition. It is attributed to higher average tungsten concentration, which on the other hand seriously exceeds the experimental value. By turning the prompt redeposition process on, the W concentration is lowered, what, in turn, results in underestimation of the radiative power losses. By analyzing the influence of the transport coefficients on the radiative power loss and average W concentration it is concluded that the way to compromise the opposing tendencies is to include the edge‐localized mode flushing mechanism into the code, which dominates the experimental particle and energy balance. Also performing the calculations with both anomalous and neoclassical diffusion transport mechanisms included is suggested.
       
  • Effect of PFC Recycling Conditions on JET Pedestal Density
    • Abstract: There is experimental evidence that the pedestal dynamics in type‐I ELMy H‐mode discharges is significantly affected by a change in the recycling conditions at the tungsten plasma‐facing components (W‐PFCs) after an ELM event. The integrated code JINTRAC has been employed to assess the impact of recycling conditions during type‐I ELMs in JET ITER‐like wall H‐mode discharges. By employing a heuristic approach, a model to mimic the physical processes leading to formation and release (i.e. outgassing) of finite near‐surface fuel reservoirs in W‐PFCs has been implemented into the EDGE2D‐EIRENE plasma‐wall interaction code being part of JINTRAC. As main result it is shown, that a delay in the density pedestal build‐up after an ELM event can be provoked by reduced recycling induced by depleted W‐PFC particle near‐surface reservoirs. However the pedestal temperature evolution is barely affected by the change in recycling parameters suggesting that the presented model is incomplete.
       
  • COREDIV and SOLPS Numerical Simulations of the Nitrogen Seeded JET ILW
           L‐mode Discharges
    • Abstract: In this paper we present the comparison of simulations with the numerical codes COREDIV and SOLPS5.0 for JET L‐mode discharges with ITER like wall (ILW). The simulations have been performed for L‐mode shots with and without nitrogen seeding (#82291 ‐ 9) which are characterised by relatively low auxiliary heating power (PNBI = 1.1 MW) and low electron density (ne = 2.35 × 1019 m–3). Comparisons are made to the experimental measurements (e.g. radiation levels, plasma profiles) and the differences between the results from the two codes (e.g. temperature and density profiles at the outer divertor plate) are shown and discussed.
       
  • Interchange Turbulence Model for the Edge Plasma in SOLEDGE2D‐EIRENE
    • Abstract: Cross‐field transport in edge tokamak plasmas is known to be dominated by turbulent transport. A dedicated effort has been made to simulate this turbulent transport from first principle models but the numerical cost to run these simulations on the ITER scale remains prohibitive. Edge plasma transport study relies mostly nowadays on so‐called transport codes where the turbulent transport is taken into account using effective ad‐hoc diffusion coeffecients. In this contribution, we propose to introduce a transport equation for the turbulence intensity in SOLEDGE2D‐EIRENE to describe the interchange turbulence properties. Going beyond the empirical diffusive model, this system automatically generates profiles for the turbulent transport and hence reduces the number of degrees of freedom for edge plasma transport codes. We draw inspiration from the k‐epsilon model widely used in the neutral fluid community. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • First Principle Modelling of Interplay between Langmuir Probes and Plasma
           Turbulence
    • Abstract: The interplay between Langmuir probes (LP) and Scrape‐Off‐Layer plasma turbulence is numerically investigated with the TOKAM2D and TOKAM3X fluid codes. The LP is modelled by biasing a part of the target plates surface; we then study its impact on the turbulent transport 1) in presence of electron temperature fluctuations and 2) with a complete description of the parallel dynamics. We find that a biased probe can disturb local plasma parameters as well as turbulent transport in its vicinity, by polarizing the connected flux tube and thus driving a strong ExB vortex. Moreover, electron temperature fluctuations are found to account significantly those of floating potential, but with a limited impact on flux measurements depending on the probe's exact geometry. The 3D study of the problem shows the attenuation, but the persistency, of these perturbations induced by the presence of the LP. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • On the Effect of Electron Temperature Fluctuations on Turbulent Heat
           Transport in the Edge Plasma of Tokamaks
    • Abstract: In this paper we study the impact of electron temperature fluctuations in a two‐dimensional turbulent model. This modification adds a second linear instability, known as sheath‐driven conducting‐wall instability, with respect to the previous isothermal model only driven by the interchange instability. Non‐linear simulations, backed up by the linear analysis, show that the additional mechanism can change drastically the dynamics of turbulence (scales, density‐potential correlation, and statistical momentum). Moreover, its importance relatively to the interchange instability should be more significant in the private flux region than in the main scrape of layer. Its effect on heat transport is also investigated for different regimes of parameters, results show that both instabilities are at play in the heat transport. Finally, the sheath neagtive resistance instability could be responsible for the existence of corrugated heat flux profiles in the scrape‐off layer leading to a multiple decay length. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Basic Consideration of Monte Carlo Algorithm to Solve Fluid Equations for
           SOL/divertor Plasmas
    • Abstract: Monte Carlo method is thought to be effective to solve fluid plasma equations for SOL/divertor plasmas, especially for three dimensional simulation. In the Monte Carlo algorithm based on a Lagrangian scheme, how to treat the Monte Carlo test particles at the calculation boundaries is not always trivial. In this paper, 1D diffusion equation with source terms has been solved with several different treatments of the boundaries in relatively a simple model. Comparison between the results and analytic solutions show that careful treatment of the boundary seems to be needed. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Numerical Simulation Study of Plasma Flow in the GAMMA10/PDX
           End‐cell Using a Fluid Code
    • Abstract: In order to understand the effect of impurity injection into divertor plasma, a multi‐fluid code was developed and applied to the region from west plug/barrier‐cell to end cell in GAMMA 10/PDX. In this research, Ar is applied as impurity neutrals. To investigate the effect of impurity injection on plasma parameters, interactions between Ar impurity and hydrogen bulk plasma were included in this model. Under the condition of injecting neutral hydrogen and impurity Ar, the charge exchange loss between hydrogen ion and neutrals reaches to about 95% and the radiation loss for electron is enhanced to about 45%. Therefore, hydrogen ion and electron temperatures decrease from about 55 eV to 4 eV and 15 eV to 4 eV, respectively. The heat load on the target plate is also reduced by nearly 80% compared with the condition of low injection rate of neutral hydrogen and impurity. It is also observed that the particle flux increases with neutral density and then shows a tendency to saturate in the higher neutral density (> 2.1 × 1018 m–3). (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Electrostatic Characteristic of Spherical Dust on PFM in Sheath Field
    • Abstract: The electrostatic characteristics of the spherical dust particle on the PFM were investigated analytically by introducing the bipolar coordinate in the plasma sheath field. The smaller dust compared to the Debye length λD is applicable to this model. It is clarified that the effect of finite size of the dust becomes remarkable at the larger dust than 0.2, Rd/λD > 0.2, where the change of the e‐folding length amounts to 10% of λD. The surface charge density on the dust is disturbed on the surface facing to the plasma due to the larger dust. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Photon Trapping Effects in DEMO Divertor Plasma
    • Abstract: In the DEMO divertor, the neutral density becomes high to produce the full detachment and therefore the photon trapping can become important. In this paper, effects of the photon trapping on the DEMO divertor plasma has been studied. The pre‐evaluation of the photon trapping effects on the fixed background plasma profile was carried out by using an iterative self‐consistent collisional radiative model. The recombining plasma near the inner target and the private region changed to the ionizing plasma by the photon‐excitation. Based on the preevaluation result, the database of the effective ionization rate coefficient including the photon transport inside a 2 mm sphere. Advantage of the 2 mm sphere approximation is that the extra calculation cost is not necessary. Iterative calculation of the SONIC including the photon trapping effects was carried out. While the electron density increased and the neutral density decreased in the wide region, the electron density decreases close to the inner strike point. This may be due to decrease in the ionization rate by decrease in the neutral density. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Turbulence Interaction with Driven Transport Barriers in the
           Scrape‐Off Layer of Tokamaks
    • Abstract: Two mechanisms able to generate a transport barrier by the stabilization of turbulence are analysed: the radial shear of the E × B velocity and the radial gradient of this shear. These two mechanisms are artificially forced in dedicated 2D non‐linear fluid simulations to study their impact on turbulence in the Scrape‐Off Layer. Generated barriers are characterized by their turbulence stopping capability and a key parameter, the barrier efficiency, is pointed out. The first two moments of this criterion can be studied to quantify the global efficiency, shape and width of the barrier as well as its intermittency. It is found that both mechanisms can drive intermittent or stable barriers but the radial shear mechanism generates stronger relaxation events. Small scale structures are damped by the E × B velocity shear while the radial shear gradient acts mainly on large scales. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Modeling of ITER Edge Plasma in the Presence of Resonant Magnetic
           Perturbations
    • Abstract: The modeling of the ITER edge is performed with the use of the code B2SOLPS5.2 in the presence of the electron conductivity caused by RMPs as well as for the reference case with the same input parameters but without RMPs. The radial electric field close to the neoclassical one is obtained without RMPs. Even the modest level of RMPs changes the direction of the electric field and causes the toroidal spin‐up of the edge plasma. At the same time the pump‐out effect is small. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Recent Developments in Plasma Edge Theory
    • Abstract: Recent developments in electromagnetic particle pinch, ion orbit loss, intrinsic rotation, rotation theory and radial electric field theory in the tokamak plasma edge are described. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • A Simplified MHD Model of Capillary Z‐Pinch Compared with
           Experiments
    • Abstract: The most accurate models of the capillary Z‐pinches used for excitation of soft X‐ray lasers and photolithography XUV sources currently are based on the magnetohydrodynamics theory (MHD). The output of MHD‐based models greatly depends on details in the mathematical description, such as initial and boundary conditions, approximations of plasma parameters, etc. Small experimental groups who develop soft X‐ray/XUV sources often use the simplest Z‐pinch models for analysis of their experimental results, despite of these models are inconsistent with the MHD equations. In the present study, keeping only the essential terms in the MHD equations, we obtained a simplified MHD model of cylindrically symmetric capillary Z‐pinch. The model gives accurate results compared to experiments with argon plasmas, and provides simple analysis of temporal evolution of main plasma parameters. The results clarify the influence of viscosity, heat flux and approximations of plasma conductivity on the dynamics of capillary Z‐pinch plasmas. The model can be useful for researchers, especially experimentalists, who develop the soft X‐ray/XUV sources. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Parametric Study of Nonplanar Dust Acoustic Solitons in
           Two‐Dimensional Superthermal Dusty Plasmas
    • Abstract: The nonlinear properties of two dimensional low‐frequency electrostatic excitations of charged dust particles (or defects) are studied in a collisionless, unmagnetized dusty plasma. A fully ionized three‐component model plasma consisting of kappa distributed electrons, Maxwellian ions, and negatively charged massive dust grains is considered. In this regard, the well known reductive perturbation technique is used to the hydrodynamical equations and the Poisson equation, obtaining the cylindrical Kadomtsev–Petviashvili (CKP) equation. A parametric investigation indicates that the structural characteristics of these nonlinear excitations (width, amplitude) are significantly affected by the plasma nonthermality as well as by the relevant plasma parameters, such as dust concentration and dust temperature. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Electrostatic Fluid Accelerator under High‐Speed Free Air Stream
    • Abstract: The electrostatic fluid accelerator (EFA) generates ionic wind with a simple structure that barely obstructs the free air stream or produce excessive noise. This paper presents the velocity characteristics of an EFA under a high speed free air stream to simulate an EFA‐powered propulsor. The results show that when the EFA generates identical velocity to the free air stream, the EFA contributes 25% of the resultant velocity. When the EFA is replaced by a rotary fan that generates identical velocity to the free air stream, the fan contributes only 13.4% of the resultant velocity. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Discharge Characteristics of Microwave Plasma in Ethanol Solution
    • Abstract: An apparatus was designed for generating plasma in ethanol solution. The plasma was generated on the top of the electrode by applying microwave radiation of 2.45 GHz. The results showed that ignition power decreased with increasing temperature of ethanol solution. However, ignition power increased with increasing pressure and point electrode radius of curvature. Plasma and bubbles were generated periodically in the same manner. The electron temperature of the plasma increased with increasing power, while it decreased with increasing pressure. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Gyrokinetic Simulations of the Tokamak Plasma Edge in Circular Limiter
           Configuration
    • Abstract: The full‐f gyrokinetic code ELMFIRE is used to simulate the impact of turbulent tokamak plasma transport on the edge plasma flow and scrape‐off‐layer width. The simulation is performed in the circular limiter configuration and extends from the magnetic axis to the material surface. The results show that the sheath potential and parallel Mach number are in agreement with theoretical predictions, while the E × B dynamics are strongly affected by the sheath boundary. The radial fall‐off of density and temperature profiles show non‐exponential behaviour in the scrape‐off‐layer. Numerical issues appearing in the ELMFIRE simulation of edge plasma transport are discussed. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Magnetic Field Models and their Application in Optimal Magnetic Divertor
           Design
    • Abstract: In recent automated design studies, optimal design methods were introduced to successfully reduce the often excessive heat loads that threaten the divertor target surface. To this end, divertor coils were controlled to improve the magnetic configuration. The divertor performance was then evaluated using a plasma edge transport code and a “vacuum approach” for magnetic field perturbations. Recent integration of a free boundary equilibrium (FBE) solver allows to assess the validity of the vacuum approach. It is found that the absence of plasma response currents significantly limits the accuracy of the vacuum approach. Therefore, the optimal magnetic divertor design procedure is extended to incorporate full FBE solutions. The novel procedure is applied to obtain first results for the new WEST (Tungsten Environment in Steady‐state Tokamak) divertor currently under construction in the Tore Supra tokamak at CEA (Commissariat à l'Energie Atomique, France). The sensitivities and the related divertor optimization paths are strongly affected by the extension of the magnetic model. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Extended Numerical Modeling of Impurity Neoclassical Transport in Tokamak
           Edge Plasmas
    • Abstract: Understanding of impurity transport in tokamaks is an important issue in order to reduce the impurity contamination in fusion core plasmas. Recently, a new kinetic numerical scheme of impurity classical/neoclassical transport has been developed. This numerical scheme makes it possible to include classical self‐diffusion (CL SD), classical inward pinch (CL IWP), and classical temperature screening effect (CL TSE) of impurity ions. However, impurity neoclassical transport has been modeled only in the case where background plasmas are in the Pfirsch‐Schluter (PS) regime. The purpose of this study is to extend our previous model to wider range of collisionality regimes, i.e., not only the PS regime, but also the plateau regime. As in the previous study, a kinetic model with Binary Collision Monte‐Carlo Model (BMC) has been adopted. We focus on the modeling of the neoclassical self‐diffusion (NC SD) and the neoclassical inward pinch (NC IWP). In order to simulate the neoclassical transport with the BCM, velocity distribution of background plasma ions has been modeled as a deformed Maxwell distribution which includes plasma density gradient. Some test simulations have been done. As for NC SD of impurity ions, our scheme reproduces the dependence on the collisionality parameter in wide range of collisionality regime. As for NC IWP, in cases where test impurity ions and background ions are in the PS and plateau regimes, parameter dependences have been reproduced. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Connecting Collisionless Landau Fluid Closures to Collisional Plasma
           Physics Models
    • Abstract: In this work, collisionless Landau fluid models are combined with collisional fluid models using a Padé approximation that is accurate in both collisionality limits. The collisionless models capture Landau damping through a nonlocal integro‐differential sub‐diffusion operator with ballistic characteristics. Collisional extensions of Landau fluid models are derived by analyzing the higher order moment equations which combine a Landau closure with collisional friction forces. The model derived here evolves fluid moments for density, parallel velocity, and anisotropic pressure and includes the frictional heat flux, the parallel thermal force and anisotropic electrical conductivity. Since anisotropies must vanish in the collisional limit, a simple closure can be derived if the friction force neglects pitch‐angle scattering for the closure moments themselves. The resulting plasma physics model is potentially quite useful for applications in magnetic fusion and astrophysics. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • The Role of “Momentum Removal” in Divertor Detachment
    • Abstract: The role of “momentum removal” (the drag force on the plasma ion flow) in divertor detachment is considered and analysed in detail. This analysis of the 2D modelling results shows that the drag force cannot reduce the power and particle flux to the target directly. However, it is essential for creating the conditions for efficient radiation and volumetric plasma recombination, which in turn do the job. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Simulation Study of Detached Plasmas by Using One‐Dimensional
           SOL‐Divertor Fluid Code with Virtual Divertor Model
    • Abstract: The detached plasmas due to the volume recombination are studied by using one‐dimensional (1D) scrape‐off‐layer‐divertor (SOL‐DIV) plasma fluid code with virtual divertor (VD) model. By introducing the anisotropic ion temperature, the parallel momentum transport equation becomes the first‐order differential and the Mach number at the sheath entrance is determined self‐consistently by the upstream condition. The total particle flux at the divertor plates and the flux amplification factors are shown as functions of the plasma density at the stagnation point and the dependence of these parameters on the heat flux from the core plasma, radial width of the flux tube in the divetor region and the strength of the impurity radiation is investigated. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Statistical Analysis of Particle Flux Flowing into the End‐Target in
           between Attached and Detached States in the Linear Divertor Plasma
           Simulator NAGDIS‐II
    • Abstract: We have investigated the particle flux flowing into the axisymmetric end‐target in the transient state from attached to detached divertor conditions in the linear plasma device NAGDIS‐II. In the transient state, a dramatic decrease of the mean particle flux and a large‐amplitude fluctuation with negative and positive spikes were observed. We have analyzed the fluctuation with a newly suggested analysis technique: pre‐multiplied cubic spectrum with the wavelet transform. Analysis result indicates that these spikes consist of a few kilohertz components. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Simulation Analysis of Carbon Deposition Profile in the Closed Helical
           Divertor Configuration in the Large Helical Device
    • Abstract: Recent long pulse plasma discharges in the Large Helical Device have been interrupted by radiation collapse induced by large amounts of dusts released from a closed divertor region. Traces of exfoliation of carbon‐rich mixed material deposition layers were found in the divertor region after the experimental campaigns, indicating that the thickly accumulated deposited layers were exfoliated and broken into dusts. Simulation of the density profiles of carbon deposition in the divertor region by EMC3‐EIRENE reasonably explains the observation of the exfoliation of the deposition layers. It shows that the positions of the exfoliated layers correspond to the area where the density of the carbon deposition is high. It also proves that change of the configuration of target plates in the closed divertor is effective for controlling the accumulation of the carbon deposition, and carbon atoms released from the new target plates does not influence the main plasma confinement region. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Effect of PSI on Momentum Input to Plasma‐Facing Material Surfaces
    • Abstract: A comprehensive formulation for momentum input to plasma‐facing material surfaces is newly tried, including a momentum increase due to ion reflection on surfaces with a new definition of momentum reflection coefficient, a momentum due to reaction of evaporated atoms, an increase due to physical sputtering, and the effect of plasma flow. Experimentally observed momentum input is evaluated with a simple formula as well as a mechanical cantilever model. In addition, the measurement with dial tension gauge in off‐plasma condition gives a total force, the value of which is compared with the above two estimations. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Interplay between Plasma Turbulence and Particle Injection in 3D Global
           Simulations
    • Abstract: The impact of a 3D localized particle source on the edge plasma in 3D global turbulence simulations is investigated using the TOKAM3X fluid code. Results apply to advanced fueling methods such as Supersonic Molecular Beam Injection (SMBI) or pellets injection. The fueling source is imposed as a volumetric particle source in the simulations so that the physics leading to the ionization of particles and its localization are not taken into account. As already observed in experiments, the localized particle source strongly perturbs both turbulence and the large scale organization of the edge plasma. The localized increase of the pressure generated by the source drives sonic parallel flows in the plasma, leading to a poloidal redistribution of the particles on the time scale of the source duration. However, the particle deposition also drives localized transverse pressure gradients which impacts the stability of the plasma with respect to interchange processes. The resulting radial transport occurs on a sufficiently fast time scale to compete with the parallel redistribution of particles, leading to immediate radial losses of a significant proportion of the injected particles. Low Field Side (LFS) and High Field Side (HFS) injections exhibit different dynamics due to their interaction with curvature. In particular, HFS particle deposition drives an inward flux leading to differences in the particle deposition efficiency (higher for HFS than LFS). These results demonstrate the importance of taking into account plasma transport in a self‐consistent manner when investigating fueling methods. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Visualization of Dust Particle Data with Plasma Simulation Results Using
           Virtual‐Reality System
    • Abstract: We develop the environment in which the time‐sequence experimental data of three‐dimensional dust particle positions observed by the stereoscopic fast framing cameras is visualized in one virtual‐reality space with the results of the equilibrium plasma simulation in the vessel device data integrally using a virtual‐reality system. Since their three‐dimensional relative positions can be displayed, it is possible to analyze the three‐dimensional relationship between the dust trajectories, the magnetic‐field structure, and the devices in the vessel. It is confirmed that the observed dust particles are distributed in the periphery region. Most dusts move along the magnetic‐field line, but some particles move radially across the lines with sharply curved trajectories. The transport direction varies from place to place. This system promoted the viewers' understanding. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • A Model of Self‐similar Radiative Transfer in Resonance Lines for
           Testing the Edge Plasma Codes
    • Abstract: Possibilities of obtaining the analytical solutions of the one‐dimensional equation of radiative transfer in resonance atomic/ionic lines in the Biberman‐Holstein model for testing the edge plasma codes are investigated. It is shown that for some types of similarity of spatial profiles of three characteristics, namely, background plasma density, line shape width and non‐radiation source of atomic excitation, the profile of excited atoms density may be described analytically in terms of the similarity of the above‐mentioned profiles. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Detailed Analysis of Plasma Resistivity in Detached Recombining Plasmas
    • Abstract: We have investigated plasma resistivity in a detached recombining plasma (DRP) by using a modified double probe theory, in which the influence of the plasma resistivity on the current‐voltage characteristics of the double probe, is taken into account. The plasma resistivity in DRP, obtained by comparing between the modified double probe theory and experimental results in the linear plasma device NAGDIS‐II, is much larger than both Spitzer resistivity and plasma resistivity caused by electron‐neutral collision including Rydberg atom's effect. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Effects of Classical and Neo‐classical Cross‐field Transport
           of Tungsten Impurity in Realistic Tokamak Geometry
    • Abstract: The initial simulation study of the neoclassical perpendicular self‐diffusion transport in the SOL/Divertor regions for a realistic tokamak geometry with the IMPGYRO code has been performed in this paper. One of the most unique features of the IMPGYRO code is calculating exact Larmor orbit of the test particle instead of assuming guiding center approximation. Therefore, effects of the magnetic drifts in realistic tokamaks are naturally taken into account in the IMPGYRO code. This feature makes it possible to calculate neoclassical transport processes, which possibly become large in the SOL/divertor plasma. Indeed, neoclassical self‐diffusion process, the resultant effect of the combination of magnetic drift and Coulomb collisions with background ions, has already been included in the IMPGYRO model. In the present paper, prior to implementing the detailed model of neoclassical transport process into IMPGYRO, we have investigated the effect of neoclassical selfdiffusion in a realistic tokamak geometry with lower single null X‐point. We also use a model with guiding center approximation in order to compare with the IMPGYRO full orbit model. The preliminary calculation results of each model have shown differences in the perpendicular average velocity of impurity ions at the top region of the SOL. The mechanism which leads to the difference has been discussed. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Transport Properties of Inertial Confinement Fusion Plasmas
    • Abstract: In this paper the transport properties of non‐isothermal dense deuterium‐tritium plasmas were studied. Based on the effective interaction potentials between particles, the Coulomb logarithm for a two‐temperature nonisothermal dense plasma was obtained. These potentials take into consideration long‐range multi‐particle screening effects and short‐range quantum‐mechanical effects in two‐temperature plasmas. Transport processes in such plasmas were studied using the Coulomb logarithm. The obtained results were compared with the theoretical works of other authors and with the results of molecular dynamics simulations. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Stopping of Deuterium in Warm Dense Deuterium from Ehrenfest
           Time‐Dependent Density Functional Theory
    • Abstract: In these proceedings, we show that time‐dependent density functional theory is capable of stopping calculations at the extreme conditions of temperature and pressure seen in warm dense matter. The accuracy of the stopping curves tends to be up to about 20% lower than empirical models that are in use. However, TDDFT calculations are free from fitting parameters and assumptions about the model form of the dielectric function. This work allows the simulation of ion stopping in many materials that are difficult to study experimentally. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Preface: Contrib. Plasma Phys. 5/2016
    •  
  • Screened Effective Interaction Potential for Two‐Component Plasmas
    • Abstract: The linear density response formalism is used to analytically obtain an effective pairwise interaction potential of charged particles that simultaneously takes into account quantum mechanical and quantum statistical effects in weakly and moderately non‐ideal plasmas at thermal equilibrium. The static dielectric function is obtained by interpolating long ‐ and short wavelength asymptotic forms of the dielectric function in the random‐phase approximation. The exchange effects are neglected in the micropotential, while the quantum‐statistical effects are accounted for in the screening. The effective potential constructed in such a way takes a finite value at the origin and proves to be screened at large distances. The thermodynamic properties of two‐component plasmas are then calculated and comparison is made with some data available in the literature. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Cover Picture: Contrib. Plasma Phys. 5/2016
    • Abstract: In the figure the anomalous behavior of the field distribution around an ion with respect to the change in the electron collision frequency is illustrated. The oscillations of the electric field produced by a moving ion can be amplified by increasing the electron collision frequency. For details see paper of Zh. Moldabekov et al. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Issue Information: Contrib. Plasma Phys. 5/2016
    •  
  • Contents: Contrib. Plasma Phys. 5/2016
    •  
  • Control of High Power Pulsed Magnetron Discharge by Monitoring the Current
           Voltage Characteristics
    • Abstract: Discharge current voltage (IV) curves are directly measured at the target of a high impulse power magnetron sputtering (HiPIMS) plasma for the target materials aluminium, chromium, titanium and copper. These discharge IV curves have been correlated with ICCD camera images of the plasma torus. A clear connection between the change in the discharge IV curve slopes at specific currents and the appearance of localized ionization zones, so‐called spokes, in a HiPIMS plasma is identified. These spokes appear above typical target current densities of 2 A/cm2. The slope of the discharge IV curves, at current densities when spokes are formed, depends on the mass of the target atoms with a higher plasma conductivity for higher mass target materials. This is explained by the momentum transfer from the sputter wind to the argon background gas, which leads to higher plasma densities for heavier target materials. The change in the VI curve slope can be used to identify the spokes regime for HiPIMS plasmas, as being mandatory for deposition of good quality materials by HiPIMS. Consequently, the discharge IV curve slope monitoring can be regarded an essential control approach of any industrial HiPIMS process, where discharge IV curves are much easier accessible compared to more complex diagnostics such as time and space resolved ICCD camera measurements. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Second Harmonic Generation of Self‐Focused Cosh‐Gaussian Laser
           Beam in Thermal Quantum Plasma by Excitation of an Electron Plasma Wave
    • Abstract: This paper presents a scheme for second harmonic generation (SHG) of an intense Cosh‐Gaussian (ChG) laser beam in thermal quantum plasmas. Moment theory approach in W.K.B approximation has been adopted in deriving the differential equation governing the propagation characteristics of the laser beam with distance of propagation. The effect of relativistic increase in electron mass on propagation dynamics of laser beam has been incorporated. Due to relativistic nonlinearity in the dielectric properties of the plasma, the laser beam gets self‐focused and produces density gradients in the transverse direction. The generated density gradients excite electron plasma wave (EPW) at pump frequency that interacts with the incident laser beam to produce its second harmonics. Numerical simulations have been carried out to investigate the effects of laser parameters on selffocusing of the laser beam and hence on the conversion efficiency of its second harmonics. Simulation results predict that within a specific range of decentered parameter the ChG laser beams show smaller divergence as they propagate and, thus, lead to enhanced conversion efficiency of second harmonics. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Excitation of Highly Charged Ions in Plasma by Ultrashort Electromagnetic
           Pulses
    • Abstract: Excitation of highly charged ions in plasmas under the action of ultrashort electromagnetic pulses is investigated theoretically in the frame of perturbation theory. The study is based on analytical expression for probability of bound‐bound transition which is derived for Gaussian pulse and Doppler broadening of spectral line shape of the transition. Electronic transitions from the ground state of hydrogen‐like ions are considered with account for fine splitting of upper energy levels. The main attention is paid to the dependence of the excitation probability on pulse duration for various ion charges and carrier frequencies of the pulse. The results obtained are of interest for plasma diagnostics based on ion excitation from ground state by ultrashort pulses. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Transport and Energy Deposition of hot Electrons through the Shock
           Ignition pre Compressed Target
    • Abstract: Shock ignition as an alternative scheme of the laser fusion has the potential of achieving efficient implosion. However, hot electrons produced in result of ignitor‐corona interaction may penetrate deep into the fuel making the compression less effective. Transport and energy deposition of hot electron beam into the dense pre compressed of HiPER target by means of Monte Carlo approach are discussed considering the influence of real density and electron beam characteristics. The target parameters before igniting the hot spot have been extracted from a fluid code and used as the initial profile for Monte Carlo simulations. In comparison with simplified step like density profile, electrons penetrate slightly deeper in the case of real shaped density profile. In addition, deposition zone of a broad spectrum electron beam is wider while, monoenergetic electrons depose their energy locally resulting more maximum energy deposition value. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • An Analytical Expression for the Electric Field and Particle Tracing in
           Modelling of Be Erosion Experiments at the JET ITER‐like Wall
    • Abstract: A new analytical approximation for the electric potential profile in the presence of an oblique magnetic field and the analytical solution for the particle motion just before the impact with a plasma‐facing surface are presented. These approximations are in good agreement with fluid solutions and the corresponding PIC simulations. These expressions were applied to provide effective physical erosion yields for Be, which have in a second step been used in ERO code simulations of spectroscopy at Be limiters of the JET ITER‐like wall. These new analytical expressions lead to an increase of the effective physical sputtering yields of Be by deuteron impact up to 30% in comparison with earlier pure numerical simulations. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Understanding of Hysteresis Behaviors at the L‐H‐L Transitions
           in Tokamak Plasma Based on Bifurcation Concept
    • Abstract: The hysteresis behaviour at the L‐H‐L transitions in tokamak plasma is investigated based on bifurcation concept. The formation of an edge transport barrier (ETB) is modeled via thermal and particle transport equations with the flow shear suppression effect on anomalous transport included. The anomalous transport is modeled based on critical gradients threshold and the flow shear is calculated from the force balance equation, couples the two transport equations leading to a non‐linear behaviour. Analytical investigation reveals that the fluxes versus gradients space exhibits bifurcation behaviour with s ‐curve soft bifurcation type. Apparently, the backward H‐L transition occurs at lower values than that of the forward L‐H transition, illustrating hysteresis behaviour. The hysteresis properties, i.e. locations of threshold fluxes, gradients and their ratios are analyzed as a function of neoclassical and anomalous transport values and critical gradients. It is found that the minimum heat flux for maintaining H ‐mode depends on several plasma parameters including the strength of anomalous transport and neoclassical transport. In particular, the hysteresis depth becomes larger when neoclassical transport decreases or anomalous transport increases. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Reduced Physics Models in SOLPS for Reactor Scoping Studies
    • Abstract: Heat exhaust is a challenge for ITER and becomes even more of an issue for devices beyond ITER. The main reason for this is that the power produced in the core scales as R3 while relying on standard exhaust physics results in the heat exhaust scaling as R1 (R is the major radius). ITER has used SOLPS (B2‐EIRENE) to design the ITER divertor, as well as to provide a database that supports the calculations of the ITER operational parameter space. The typical run time for such SOLPS runs is of the order 3 months (for D+C+He using EIRENE to treat the neutrals kinetically with an extensive choice of atomic and molecular physics). Future devices will be expected to radiate much of the power before it crosses the separatrix, and this requires treating extrinsic impurities such as Ne, Ar, Kr and Xe — the large number of charge states puts additional pressure on SOLPS, further slowing down the code. For design work of future machines, fast models have been implemented in system codes but these are usually unavoidably restricted in the included physics. As a bridge between system studies and detailed SOLPS runs, SOLPS offers a number of possibilities to speed up the code considerably at the cost of reducing the fidelity of the physics. By employing a fluid neutral model, aggressive bundling of the charge state of impurities, and reducing the size of the grids used, the run time for one second of physics time (which is often enough for the divertor to come to a steady state) can be reduced to approximately one day. This work looks at the impact of these trade‐offs in the physics by comparing key parameters for different simulation assumptions. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • On the Origin of Steep and Localized Radial Electric Field in the
           Transport Barrier at Plasma Edge
    • Abstract: Theories to understand the steep and localized radial electric field in the edge of toroidal plasma, which appears in conjunction with H‐mode, is revisited based on the electric field bifurcation model. Key elements in the models of the L‐H transition (including the toroidal effects on the dielectric constant and the effects of the curvature of radial electric field on turbulence suppression) are assessed. Results are applied to tokamak and helical plasmas, for which data with high‐resolution have been obtained recently. The status of quantitative tests on various mechanisms through comparison with experimental observations is also addressed. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Development of a Drift‐Kinetic Simulation Code for Estimating
           Collisional Transport Affected by RMPs and Radial Electric Field
    • Abstract: A drift‐kinetic 8f simulation code is developed for estimating collisional transport in quasi‐steady state of toroidal plasma affected by resonant magnetic perturbations and radial electric field. In this paper, validity of the code is confirmed through several test calculations. It is found that radial electron flux is reduced by positive radial‐electric field, although radial diffusion of electron is strongly affected by chaotic field‐lines under an assumption of zero electric field. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Simulation of Radiative Divertor Plasmas by Ar Seeding with the Full
           W‐Wall in JT‐60SA
    • Abstract: Radiative divertor plasmas for JT‐60SA with a full tungsten (W) wall, which is one of options in future, have been simulated with a SOL/divertor integrated code, SONIC. A conventional modified‐coronal radiation (MCR) model with a finite confinement time is used for both Ar and W for the purpose of wide‐range parameter surveys for the divertor plasma to obtain the required conditions (qt ≤ 10 MW/m2, nSepe–mid = 3∼8×1019 m–3,Prad< ∼ 30 MW), saving the calculation time. At low W density ratio (nW /ni = 1×10–5), due to low radiative power from W ions, Ar density ratio (nAr/ni ≥ 1.0× 10–3) and a strong gas puff (Γp ≥ 3.0×1022 s–1) are inevitable to suppress the divertor heat flux down to 10 MW/m2. Increasing nW/ni to 1×10–3 in the divertor region, the divertor heat load becomes low and the operative regions are expanded. While, the W production shall be suppressed since the W radiation is increased with replacement of Ar radiation and the particle recycling decreased. A Monte‐Carlo module (IMPMC) implemented in SONIC for Ar seeding reveals that the spatial distribution of Ar ions is predominantly determined by shell structures of the Ar ions. The consistency between IMPMC and MCR calculations is demonstrated for the averaged n Ar/n i ratio, the electron density and temperature profiles on the divertor target and typical parameter such as the divertor heat load. It shows that the detailed analysis with IMPMC model can be speedily obtained, using a steady state solution obtained by MCR model as an initial state. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Turbulence Dynamics with the Coupling of Density Gradient and Parallel
           Velocity Gradient in the Edge Plasmas
    • Abstract: Theory of parallel shear flow driven instability (PSFI) and its impact on turbulence dynamics and transport are presented. The mode is linearly unstable when the parallel flow shear exceeds a critical value. The quasilinear particle flux contains both outward and inward components. Nonlinear dynamics is formulated in terms of hydrodynamic helicity balance. The result implies that once excited, PSFI with helicity may spread from the excited region to stable regions. Implication for turbulence in scrape off layer plasmas is discussed. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Modeling of Linear Divertor Plasma Simulator Experiments with
           Three‐dimensional Target Structure by Using EMC3‐EIRENE Code
    • Abstract: We have adapted the EMC3‐EIRENE code for modeling of a linear divertor plasma simulator in order to demonstrate plasma‐wall interactions with three‐dimensional (3D) effects. 3D distributions of hydrogen plasma and neutrals can be successfully calculated for four different types of target plates: a V‐shaped target, inclined targets with open and closed structures, and a planer target. Hydrogen atoms and molecules are accumulated more effectively in the V‐shaped target plate, leading to a higher electron density with lower electron temperature than the planar target plate. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Ginzburg‐Landau Model in a Finite Shear‐Layer and Onset of
           Transport Barrier Nonlinear Oscillations: A Paradigm for TypeIII ELMs
    • Abstract: We study a Reaction‐Diffusion model describing the nonlinear oscillations of a transport barrier in a finite shear‐layer (width dE ≪ a), where a is the plasma minor radius, based on a 1D reduced model derived to explain nonlinear barrier oscillations in 3D turbulence simulations [P. Beyer, S. Benkadda, G. Fuhr‐Chaudier et al., Phys. Rev. Lett. 94, 105001 (2005)]. We show that this single nonlinear equation encompasses most of the physics of these barrier relaxations. The nonlinear oscillations have common characteristics with type‐III edge localized modes (ELMs), such as a repetition frequency which decreases with increasing power. In addition to the flow shear, the shear‐layer width is also shown to control the nature of the oscillations. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Rubrik
    • Abstract: An energy‐conserving reduced kinetic model is formulated which is valid for perturbations with large amplitude and long wavelength beyond the standard gyrokinetic ordering. The standard gyrokinetic model is elegantly formulated by the two‐step phase space transformation consisting of the guiding‐center and gyro‐center transformations, but the amplitude of perturbations is assumed to be small in return for use of the two‐step transformation. Besides, the wavelength of perturbations is assumed to be short in deriving the gyrokinetic Poisson equation. Both limitations are relaxed by using the modified guiding‐center 1‐form for flowing plasmas [Miyato et al., J. Phys. Soc. Jpn. 78, 104501 (2009)]. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Modeling of Small‐sized ELMs in Detached Divertor Plasmas
    • Abstract: Self‐consistent modeling of edge plasma transport and deuterium wall inventory including multiple transient events was performed with the multi‐physics 2‐D transport code UEDGE‐MB‐W. In agreement with experimental data trends on DIII‐D, the modeling results show that relatively small‐sized and frequent type‐I Edge Localized Mode (ELM) events, which are typical for high‐power H‐mode discharges with strong deuterium gas‐puff fueling on this tokamak, are not “burning through” the formed detached plasma in the inner and, with further increase in fueling, in the outer divertor. In the latter case, the divertors are filled by sub‐eV, high‐density, strongly‐recombining and highly impurity contaminated plasma. Time‐dependent experimental data supporting the view that volumetric plasma recombination is enhanced during small‐sized ELMs penetrating into the detached plasma are discussed and the confirmatory results from UEDGE‐MB‐W modeling are presented. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Long‐Time Evolution of a Low Pressure Laboratory Plasma after
           Application of Transient high Voltage Positive Pulses
    • Abstract: The long‐time evolution of weakly‐collisional plasma with application of high voltage positive pulses to an electrode immersed in plasma, with pulse widths less than as well as more than ion plasma periods, is studied. The plasma is produced by electron impact ionization of argon or helium gas, where electrons are coming out from dc biased hot thoriated tungsten filaments. It is observed that during the temporal evolution of argon plasma, a beam component exists along with temporal bulk electrons giving rise to a double hump profile of transient Electron Distribution Function (EDF). However, in the case of temporal evolution of helium plasma, only a bulk electron population is present. The obtained results are explained by understanding the role played by thermionically emitted electrons during the plasma evolution, the role of the difference of ionization rates of helium and argon, and the higher temporal plasma potential. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Effects of Multi‐Species Ions on Sheath and Presheath in a Magnetic
           Field Decreasing toward a Wall
    • Abstract: In the divertor region, the plasma contains deuterium (D) ion and tritium (T) ion in an open magnetic field. The effect of D ion and T ion on the electric potential near the wall in plasma with magnetic field decreasing toward a wall is investigated analytically. The distribution of the electric potential is obtained by plasma‐sheath equation, where D ion and T ion are considered. The potential distribution depends on the parameters such as the profile of the magnetic field, the temperatures of D ion and T ion, and the amount rate of T ion to D ion. The particle distribution also is shown. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • Simulations of Tungsten Re‐deposition Using a
           Particle‐In‐Cell Code with Non‐uniform Super Particle
           Sizes
    • Abstract: Tungsten (W), a promising candidate as divertor plasma facing material in magnetic fusion devices, is anticipated to promptly redeposit when sputtered or evaporated from surface due to its small ionization energy and long gyro radius. Using an artificial factor for the reaction cross sections, effects of ionization lengths to the re‐deposition rate was studied by a newly developed particle‐in‐cell code. Treating numbers of particles in a super particle, electric charge, and mass as particle variables in the code, a special scheme for ionization and recombination was developed and used for the calculation. Simulations on W test particles with imaginary properties (neglecting the electric force) revealed the effects of ejection angles. Simulations with secondary electrons from surface showed that the sheath potential is weakened and the re‐deposition rate becomes small. It was found that the multi‐ionization as well as the ionization mean‐free‐path influences the re‐deposition rate in both simulations. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
  • EMC3‐EIRENE Simulation of Impurity Transport in Comparison with EUV
           Emission Measurements in the Stochastic Layer of LHD: Effects of Force
           Balance and Transport Coefficients
    • Abstract: The transport properties and line emissions of the intrinsic carbon in the stochastic layer of the Large Helical Device have been investigated with the three‐dimensional edge transport code EMC3‐EIRENE. The simulations of impurity transport and emissivity have been performed to study the dedicated experiment in which the carbon emission distributions are measured by a space‐resolved EUV spectrometer system. A discrepancy of the CIV impurity emission between the measurement and simulation is obtained, which is studied with the variation of the ion thermal force, friction force and the perpendicular diffusivity in the impurity transport model. An enhanced ion thermal force or a reduced friction force in the modelling can increase the CIV impurity emission at the inboard X‐point region. Furthermore, the impact of the perpendicular diffusivity Dimp is studied which shows that the CIV impurity emission pattern is very sensitive to Dimp. It is found that the simulation results with the increased Dimp tend to be closer to the experimental observation. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
 
 
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