for Journals by Title or ISSN
for Articles by Keywords
help
  Subjects -> PHYSICS (Total: 803 journals)
    - ELECTRICITY AND MAGNETISM (9 journals)
    - MECHANICS (20 journals)
    - NUCLEAR PHYSICS (49 journals)
    - OPTICS (89 journals)
    - PHYSICS (583 journals)
    - SOUND (22 journals)
    - THERMODYNAMICS (31 journals)

PHYSICS (583 journals)            First | 1 2 3 | Last

Showing 201 - 400 of 741 Journals sorted alphabetically
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: 4)
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: 75)
Journal of Applied Remote Sensing     Hybrid Journal   (Followers: 20)
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: 1)
Journal of Building Physics     Hybrid Journal   (Followers: 1)
Journal of Chromatographic Science     Hybrid Journal   (Followers: 20)
Journal of Complex Networks     Hybrid Journal   (Followers: 1)
Journal of Composite Materials     Hybrid Journal   (Followers: 209)
Journal of Computational Methods in Physics     Open Access  
Journal of Computational Physics     Hybrid Journal   (Followers: 52)
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: 4)
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: 22)
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: 9)
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: 6)
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: 2)
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: 33)
Journal of Physical Chemistry C     Full-text available via subscription   (Followers: 25)
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: 2)
Journal of Testing and Evaluation     Full-text available via subscription   (Followers: 18)
Journal of the American Society for Mass Spectrometry     Hybrid Journal   (Followers: 23)
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: 35)
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  
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: 29)
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: 7)
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: 18)
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: 17)
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: 55)
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)
Nanospectroscopy     Open Access  

  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
       
  • Usage of Ray Tracing Transfer Matrix to Mitigate the Stray Light for ITER
           Spectroscopy
    • Authors: S. Kajita; E. Veshchev, R. Barnsley, M. Walsh
      Abstract: Stray light formed by the reflection of photons on inner wall from a bright divertor region can be a serious issue in spectroscopic measurement systems in ITER. In this study, we propose a method to mitigate the influence of stray light using a ray tracing analysis. Usually, a ray tracing simulation requires a time consuming runs. We constructed transfer matrices based on the ray tracing simulation results and used them to demonstrate the influence of stray light. It is shown that the transfer matrix can be used to reconstruct the emission profile by considering the influence of the stray light without any additional ray tracing runs. Mitigation of the stray light in ITER divertor impurity monitor was demonstrated, and a method of prediction of the stray light level for the scrape off layer spectroscopy from divertor region was proposed. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2016-05-04T06:10:09.086432-05:
      DOI: 10.1002/ctpp.201500124
       
  • Numerical Modeling on Heat Transport Across Stochastic Magnetic Field
    • Authors: Q. Wang; X. Zha, H. Lu, X. Wang, B. Wu, S. Zhu
      Abstract: The heat diffusion across the stochastic magnetic field is studied numerically. The stochastic field is generated by the overlap of two magnetic islands. The parameter w/wc, is found tobe an important parameter in charactering the transport, where w is the magnetic island width, and wc is the critical island width for flattening the electron temperature across an island. For w/wc < 1, the enhanced radial heat diffusivity χr is proportional to the parallel heat diffusivity χ∥, and the heat transport is dominated by the additive effect of individual islands. For w/wc > 3, χr is also proportional to χ∥ and the additional degradation of the energy confinement due to stochastic magnetic field becomes apparent. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2016-05-04T06:10:08.318582-05:
      DOI: 10.1002/ctpp.201500087
       
  • Simulation and Experimental Study for Degradation of Organic Dyes Using
           Dual pin‐to‐plate Corona Discharge Plasma reactors for
           Industrial Wastewater Treatment
    • Abstract: This work researches the possibility of increasing the dye removal efficiency from wastewater using nonthermal plasma. A study for the optimal air gap distance between dual pin and surface of Acid Blue 25 dye solution and thickness of ground plate is carried out using 3D‐EM simulator to find maximum electric field intensity at the tip of both pins. The consequences display that the best gap for corona discharge is approximately 5 mm using 15 kV source. In addition, the optimum plate thickness is 0.1 mm. These distance and thickness were mentioned are constant during the study of other factors. Dual pin‐to‐plate high‐voltage corona discharge plasma system is presented to investigation experimentally the gap distance, thickness of ground plate, initial dye concentration, pH solution and conductivity on the amount of Acid Blue 25 dye color removal efficiency from wastewater. There is a large consensus among the simulation and experimental work in the air gap and thickness of ground plate. Where the decolorization for air gap 5 mm is 95.74 at time 35 min compared with 91% and 17% for 1 mm and 20 mm gap distance respectively. Also, the discharge energy at each air gap are calculated. Measurement results for the impact of thickness of an Aluminum ground plate on color removal competence showed color removal efficiencies of 86.3%, 90.78% and 98.06%, after treatment time 15 min for thicknesses of 2, 0.5 and 0.1 mm respectively. The decolorization behavior utilizing dual pin‐to‐plate corona discharge plasma system display 82% pigment evacuation proficiency inside 11min. The complete decolorization was accomplished within 28min for distinctive examined introductory color focuses 5 ppm up to 100 ppm. Likewise, the impacts of conductivity by utilizing diverse salts as AlCl3, CaCl2, KCl and NaCl and with distinctive focuses have been explored. The rising of the solution conductivity leads to the reduction of decolorization efficiency. The decolorization efficiency and discharge energy are calculated at different concentration molarity for AlCl3, CaCl2, KCl and NaCl. It was observed that the presence of salts at the same concentration level substantially decreased the rate and the extent of decolorization. The results indicate that the optimum pH for the decolorization of Acid Blue 25 dye is in the range between 3 and 6. Furthermore the conductivity and discharge energy were measurement at each value of pH. Energy yield for decolorization and Electrical Energy per Order (EE/O) under different initial pH value were calculated. A kinetic model is used to define the performance of corona discharge system under different value of pH. The model of pseudo ‐zero, pseudo‐first order, and pseudo‐second order reactions kinetic are utilized to investigate the decolorization of Acid Blue 25 dye. The rate of degradation of Acid Blue 25 dye follows the pseudo‐first order kinetics in the dye concentration. Energy consumption requirements for decolorization was considered. The outcomes will be useful for designing the plasma treatment systems suitable for industrial wastewaters. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2016-05-04T06:10:07.212529-05:
      DOI: 10.1002/ctpp.201500080
       
  • Statistical Model of Dielectronic Recombination of Heavy Ions in Plasmas
    • Authors: D. S. Leontyev; V. S. Lisitsa
      Abstract: Calculation of the total dielectronic recombination (DR) rates was done in the frame of a statistical model of atoms. The model is based on the idea of collective excitations of atomic electrons with the local plasma frequency, which depends on atomic electrons density distribution. The electron density is described in a frame of the Thomas‐Fermi model of atoms. Simple scaling laws for temperature Te and nuclear charge Z dependences follow from the statistical model of DR. Results of the statistical model were compared with other numerical data following detailed level‐by‐level computations for different multielectron ions. The specific attention is paid to Ni‐like ion sequences of different chemical elements in order to check the Z ‐dependence of DR rates. A comparison with numerical data of Flexible Atomic Code (FAC) is presented for tungsten ions. The reasonable correspondence between the statistical model and the detailed numerical data is demonstrated. The application of the statistical model provides very simple and fast calculations of the DR rates useful in modern plasma modelling. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2016-05-04T06:10:06.34635-05:0
      DOI: 10.1002/ctpp.201500075
       
  • The Organosilicon thin Film Deposited Using an Atmospheric Pressure
           Dual‐Frequency 50 kHz/33 MHz Frequency MicroPlasma Jet
    • Authors: Q. H. Yuan; X. M. Wang, G. Q. Yin, J. Li, C. Z. Dong
      Abstract: In this paper, an atmospheric pressure dual‐frequency (50 kHz/33 MHz) micro‐plasma jet was used to deposit organosilicon film. The discharge generated in atmospheric environment. Plasma composition was characterized by optical emission spectroscopy. With introduction of tetraethyl orthosilicate, we observed various spectra, for example Si(251.6 nm), OH(308.9 nm), C(247.8 nm), O(777.5 nm). Abundant reactive radical species which are benefit to film deposition were generated in plasma. The deposited film was characterized by scanning electron microscopy, X‐ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. The film is mostly composed of Si and O. The film has Si‐O‐Si backbone with a small number of organic component (‐CHx). (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2016-05-04T06:10:05.50579-05:0
      DOI: 10.1002/ctpp.201500066
       
  • Factorization of 3‐Point Static Structure Functions in 3D Yukawa
           Liquids
    • Abstract: In many‐body systems the convolution approximation states that the 3‐point static structure function, S(3)(k1, k2), can approximately be “factorized” in terms of the 2‐point counterpart, S(2)(k1). We investigate the validity of this approximation in 3‐dimensional strongly‐coupled Yukawa liquids: the factorization is tested for specific arrangements of the wave vectors k1 and k2, with molecular dynamics simulations. With the increase of the coupling parameter we find a breakdown of factorization, of which a notable example is the appearance of negative values of S(3)(k1, k2), whereas the approximate factorized form is restricted to positive values. These negative values – based on the quadratic Fluctuation‐Dissipation Theorem – imply that the quadratic part of the density response of the system changes sign with wave number. Our simulations that incorporate an external potential energy perturbation clearly confirm this behavior. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2016-05-04T06:10:04.411432-05:
      DOI: 10.1002/ctpp.201500062
       
  • 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
       
  • 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)
       
 
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
 
Home (Search)
Subjects A-Z
Publishers A-Z
Customise
APIs
Your IP address: 54.81.230.27
 
About JournalTOCs
API
Help
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-2015