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PHYSICS (543 journals)            First | 1 2 3 4 5 6 | Last

ECS Journal of Solid State Science and Technology     Full-text available via subscription   (Followers: 1)
Egyptian Journal of Remote Sensing and Space Science     Open Access   (Followers: 5)
EJNMMI Physics     Open Access  
Embedded Systems Letters, IEEE     Hybrid Journal   (Followers: 18)
Energy Procedia     Open Access   (Followers: 3)
Engineering Failure Analysis     Hybrid Journal   (Followers: 27)
Engineering Fracture Mechanics     Hybrid Journal   (Followers: 18)
Environmental Fluid Mechanics     Hybrid Journal   (Followers: 2)
EPJ Nonlinear Biomedical Physics     Open Access  
EPJ Quantum Technology     Open Access  
EPJ Techniques and Instrumentation     Full-text available via subscription  
EPJ Web of Conferences     Open Access  
European Journal of Physics     Full-text available via subscription   (Followers: 4)
European Journal of Physics Education     Open Access   (Followers: 5)
European Physical Journal - Applied Physics     Full-text available via subscription   (Followers: 5)
European Physical Journal C     Hybrid Journal  
Europhysics News     Open Access   (Followers: 1)
Experimental Mechanics     Hybrid Journal   (Followers: 16)
Experimental Methods in the Physical Sciences     Full-text available via subscription  
Experimental Techniques     Hybrid Journal   (Followers: 30)
Exploration Geophysics     Hybrid Journal   (Followers: 3)
Few-Body Systems     Hybrid Journal  
Fire and Materials     Hybrid Journal   (Followers: 5)
Flexible Services and Manufacturing Journal     Hybrid Journal   (Followers: 1)
Fluctuation and Noise Letters     Hybrid Journal   (Followers: 1)
Fluid Dynamics     Hybrid Journal   (Followers: 5)
Fortschritte der Physik/Progress of Physics     Hybrid Journal  
Frontiers in Physics     Open Access   (Followers: 2)
Frontiers of Materials Science     Hybrid Journal   (Followers: 4)
Frontiers of Physics     Hybrid Journal   (Followers: 1)
Fusion Engineering and Design     Hybrid Journal   (Followers: 2)
Geochemistry, Geophysics, Geosystems     Full-text available via subscription   (Followers: 21)
Geografiska Annaler, Series A: Physical Geography     Hybrid Journal   (Followers: 3)
Geophysical Research Letters     Full-text available via subscription   (Followers: 48)
Geoscience and Remote Sensing, IEEE Transactions on     Hybrid Journal   (Followers: 20)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 2)
Granular Matter     Hybrid Journal   (Followers: 2)
Graphs and Combinatorics     Hybrid Journal   (Followers: 6)
Handbook of Geophysical Exploration: Seismic Exploration     Full-text available via subscription  
Handbook of Metal Physics     Full-text available via subscription  
Handbook of Surface Science     Full-text available via subscription   (Followers: 3)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription  
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 4)
Heat Transfer - Asian Research     Hybrid Journal   (Followers: 6)
High Energy Density Physics     Hybrid Journal   (Followers: 1)
High Pressure Research: An International Journal     Hybrid Journal   (Followers: 1)
IEEE Journal of Quantum Electronics     Hybrid Journal   (Followers: 15)
IEEE Signal Processing Magazine     Full-text available via subscription   (Followers: 28)
IET Optoelectronics     Hybrid Journal   (Followers: 2)
Il Colle di Galileo     Open Access  
Indian Journal of Biochemistry and Biophysics (IJBB)     Open Access   (Followers: 4)
Indian Journal of Physics     Hybrid Journal   (Followers: 4)
Indian Journal of Pure & Applied Physics (IJPAP)     Open Access   (Followers: 8)
Indian Journal of Radio & Space Physics (IJRSP)     Open Access   (Followers: 5)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 11)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Infinite Dimensional Analysis, Quantum Probability and Related Topics     Hybrid Journal  
InfraMatics     Open Access  
Infrared Physics & Technology     Hybrid Journal  
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 1)
Intermetallics     Hybrid Journal   (Followers: 5)
International Applied Mechanics     Hybrid Journal   (Followers: 2)
International Geophysics     Full-text available via subscription   (Followers: 3)
International Journal for Computational Methods in Engineering Science and Mechanics     Hybrid Journal   (Followers: 8)
International Journal for Ion Mobility Spectrometry     Hybrid Journal   (Followers: 1)
International Journal for Simulation and Multidisciplinary Design Optimization     Full-text available via subscription   (Followers: 1)
International Journal of Abrasive Technology     Hybrid Journal   (Followers: 2)
International Journal of Aeroacoustics     Full-text available via subscription   (Followers: 6)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 1)
International Journal of Astronomy and Astrophysics     Open Access   (Followers: 3)
International Journal of Computational Materials Science and Surface Engineering     Hybrid Journal   (Followers: 7)
International Journal of Damage Mechanics     Hybrid Journal   (Followers: 5)
International Journal of Fatigue     Hybrid Journal   (Followers: 7)
International Journal of Fracture     Hybrid Journal   (Followers: 9)
International Journal of Geometric Methods in Modern Physics     Hybrid Journal   (Followers: 1)
International Journal of Geophysics     Open Access   (Followers: 3)
International Journal of Heat and Fluid Flow     Hybrid Journal   (Followers: 9)
International Journal of Low Radiation     Hybrid Journal  
International Journal of Low-Carbon Technologies     Open Access   (Followers: 1)
International Journal of Mass Spectrometry     Hybrid Journal   (Followers: 12)
International Journal of Material Forming     Hybrid Journal   (Followers: 2)
International Journal of Materials and Product Technology     Hybrid Journal   (Followers: 4)
International Journal of Mechanical Sciences     Hybrid Journal   (Followers: 5)
International Journal of Mechanics and Materials in Design     Hybrid Journal   (Followers: 5)
International Journal of Medical Physics, Clinical Engineering and Radiation Oncology     Open Access   (Followers: 4)
International Journal of Micro-Nano Scale Transport     Full-text available via subscription   (Followers: 2)
International Journal of Microstructure and Materials Properties     Hybrid Journal   (Followers: 7)
International Journal of Microwave Science and Technology     Open Access   (Followers: 2)
International Journal of Modeling, Simulation, and Scientific Computing     Hybrid Journal   (Followers: 1)
International Journal of Modern Physics A     Hybrid Journal   (Followers: 2)
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: 2)
International Journal of Nanomanufacturing     Hybrid Journal   (Followers: 1)
International Journal of Nanoscience     Hybrid Journal   (Followers: 1)
International Journal of Nanotechnology     Hybrid Journal   (Followers: 5)
International Journal of Non-Linear Mechanics     Hybrid Journal   (Followers: 4)
International Journal of Physical Sciences     Open Access  
International Journal of Physics     Open Access  

  First | 1 2 3 4 5 6 | Last

Journal Cover Contributions to Plasma Physics
   [4 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  [1603 journals]   [SJR: 0.612]   [H-I: 29]
  • Lenard‐Balescu Calculations and Classical Molecular Dynamics
           Simulations of Electrical and Thermal Conductivities of Hydrogen Plasmas
    • Authors: H. D. Whitley; Ch. R. Scullard, L. X. Benedict, J. I. Castor, A. Randles, J. N. Glosli, D. F. Richards, M. P. Desjarlais, F. R. Graziani
      Pages: n/a - n/a
      Abstract: We present a discussion of kinetic theory treatments of linear electrical and thermal transport in hydrogen plasmas, for a regime of interest to inertial confinement fusion applications. In order to assess the accuracy of one of the more involved of these approaches, classical Lenard‐Balescu theory, we perform classical molecular dynamics simulations of hydrogen plasmas using 2‐body quantum statistical potentials and compute both electrical and thermal conductivity from our particle trajectories using the Kubo approach. Our classical Lenard‐Balescu results employing the identical statistical potentials agree well with the simulations. Comparison between quantum Lenard‐Balescu and classical Lenard‐Balescu for conductivities then allows us to both validate and critique the use of various statistical potentials for the prediction of plasma transport properties. These findings complement our earlier MD/kinetic theory work on temperature equilibration [1], and reach similar conclusions as to which forms of statistical potentials best reproduce true quantum behavior. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-12-04T06:13:28.962083-05:
      DOI: 10.1002/ctpp.201400066
       
  • Towards ab Initio Thermodynamics of the Electron Gas at Strong Degeneracy
    • Authors: T. Schoof; S. Groth, M. Bonitz
      Pages: n/a - n/a
      Abstract: Recently a number of theoretical studies of the uniform electron gas (UEG) at finite temperature have appeared that are of relevance for dense plasmas, warm dense matter and laser excited solids and thermodynamic density functional theory simulations. In particular, restricted path integral Monte Carlo (RPIMC) results became available which, however, due to the Fermion sign problem, are confined to moderate quantum degeneracy, i.e. low to moderate densities. We have recently developed an alternative approach–configuration PIMC [T. Schoof et al., Contrib. Plasma Phys. 51, 687 (2011)] that allows one to study the so far not accessible high degeneracy regime. Here we present the first step towards UEG simulations using CPIMC by studying implementation and performance of the method for the model case of N = 4 particles. We also provide benchmark data for the total energy. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-12-04T06:13:27.447548-05:
      DOI: 10.1002/ctpp.201400072
       
  • Hierarchy of Fluctuation‐Dissipation Theorems for the Classical
           One‐Component Plasma
    • Authors: K. I. Golden; J. T. Heath
      Pages: n/a - n/a
      Abstract: We have derived tractable cubic (p = 3) and quartic (p = 4) fluctuation‐dissipation theorems (FDTs) for the classical one‐component plasma in a form that links a single (p + 1)‐point dynamical structure function to a linear combination of p th‐order density response functions amenable to calculation from model plasma kinetic equations. For p ≥ 3, we note the emergence of “remainder” contributions comprised of clusters of lower‐order dynamical structure functions which can be ultimately traded for response functions vis‐á‐vis the linear and quadratic FDTs. Our analysis provides insight into the structure of the FDT hierarchy. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-12-04T06:13:26.060248-05:
      DOI: 10.1002/ctpp.201400082
       
  • A tribute to pioneers of strongly coupled plasmas: Hugh E. DeWitt, Bernard
           Jancovici, and Forrest J. Rogers
    • Authors: H. D. Whitley; A. Alastuey, J.A. Gaffney, R. Cauble, W.D. Kraeft, M. Bonitz
      Pages: n/a - n/a
      Abstract: The field of strongly coupled Coulomb systems that stretches from dense plasma, to astrophysics, condensed matter and high energy physics has seen a dramatic development over the last four decades. At the beginning of this process were a few physicists whose work has had a high impact on many exciting developments of the recent years. Among them are Hugh E. DeWitt, Bernard Jancovici and Forrest J. Rogers who passed away in 2013–2014. Their important contributions to the field of strongly coupled Coulomb systems are summarized in this article. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-12-04T06:13:24.52535-05:0
      DOI: 10.1002/ctpp.201400083
       
  • Plasma‐Plasma and Liquid‐Liquid First‐Order Phase
           Transitions
    • Authors: G. E. Norman; I. M. Saitov, V. V. Stegailov
      Pages: n/a - n/a
      Abstract: Ab initio quantum modeling is applied to check the ideas that motivated studies of both plasma phase transition (PPT) and Brazhkin semiconductor‐to‐metal phase transition, and to analyze both similarity and difference between them as well as with the Wigner metallization. Electron density of states and the characteristic gap in it are investigated to verify the semiconductor‐to‐metal nature of the transition. The change of plasma frequency is suggested to be used instead of the “degree of ionization” to characterize the difference between two plasma phases at PPT. Electron density of states, pair distribution function, and conductivity are calculated as well. It is shown that Norman‐Starostin ideas about (a) PPT and (b) phase diagram for fluids are not anymore a hypothesis. They are confirmed by the experimental data. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-12-04T06:13:22.758472-05:
      DOI: 10.1002/ctpp.201400088
       
  • Diagnostics of Tin Plasma Produced by Visible and IR Nanosecond Laser
           Ablation
    • Authors: M. Hanif; M. Salik
      Pages: n/a - n/a
      Abstract: We present the optical emission spectroscopic studies of the Tin (Sn) plasma, produced by the fundamental (1064 nm) and second (532 nm) harmonics of a Q switched Nd: YAG pulsed laser having pulse duration of 5 ns and 10 Hz repetition rate which is capable of delivering 400 mJ at 1064 nm, and 200 mJ at 532 nm using Laser Induced Breakdown Spectroscopy (LIBS). The laser beam was focused on target material by placing it in air at atmospheric pressure. The experimentally observed line profiles of four neutral tin (Sn I) lines at 231.72, 248.34, 257.15 and 266.12 nm were used to extract the electron temperature (Te) using the Boltzmann plot method and determined its value 6360 and 5970 K respectively for fundamental and second harmonics of the laser. Whereas, the electron number density (Ne) has been determined from the Stark broadening profile of neutral tin (Sn I) line at 286.33 nm and determined its value 5.85 x 1016 and 6.80 x 1016cm–3 for fundamental and second harmonics of the laser respectively. Both plasma parameters (Te and Ne) have also been calculated by varying distance from the target surface along the line of propagation of plasma plume and also by varying the laser irradiance. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-12-04T05:42:39.353283-05:
      DOI: 10.1002/ctpp.201400055
       
  • Effects of Direct Double Auger Decay on the Population Dynamics of Neon
           Irradiated by Ultraintense x‐ray Pulses
    • Authors: C. Gao; J. Zeng, J. Yuan
      Pages: n/a - n/a
      Abstract: The population and charge state distribution of neon interacting with ultraintense x‐ray pulses are investigated by solving a time‐dependent rate equation in the detailed level‐accounting (DLA) approximation. Due to the detailed description of neon atom and ions, our DLA result improves the agreement between predictions and experimental measurements for odd neon charge states. In the framework of the DLA formalism, we further studied the effects of direct double Auger decay (DDAD) on charge state distribution. After the 1s photoionization of neon atom, the DDAD processes give accessible decay channels from the K‐shell hole state of Ne+ to levels of Ne3+, resulting in an increase of the population fraction of Ne3+ and a decrease of that of Ne2+. Compared with the results without considering the DDAD effects, better agreement is obtained between theory and experiment. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-12-04T05:42:38.075782-05:
      DOI: 10.1002/ctpp.201400061
       
  • Effects of the System Temperature on Dust Cluster Formation in Plasma
    • Authors: Y. L. Song; F. Huang, Z. Y. Chen, Y. H. Liu, M. Y. Yu, K. F. Chen, L. Wang
      Pages: n/a - n/a
      Abstract: Effects of the system temperature on dust aggregation in plasmas are investigated using two‐dimensional molecular dynamics simulations. It is shown that as the system temperature increases, the boundary of the clusters becomes gradually irregular (i.e., deviating from sphere‐like), and the cluster system gradually changes from solid to liquid and finally to gas state. The mean square displacement, mean nearest‐neighbor distance in the clusters, cluster size and coupling parameter of the system are obtained and the properties of the system structure and dynamics are investigated. The time τ needed for reaching equilibrium for different temperatures is obtained. It is shown that τ firstly decreases and then increases with the temperature, indicating that there is an optimum temperature allowing a dust aggregation to reach an equilibrium state most rapidly. The simulation results agree qualitatively with the experimental observations. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-11-27T07:20:10.41795-05:0
      DOI: 10.1002/ctpp.201400028
       
  • First‐Principle Results for the Radial Pair Distribution Function in
           Strongly Coupled One‐Component Plasmas
    • Authors: T. Ott; M. Bonitz
      Pages: n/a - n/a
      Abstract: The radial pair distribution function (RPDF) is the most simple way to characterize the structure of a system. In this work, we provide a comprehensive overview of the dependence of the RPDF on the coupling parameter and screening length in Coulomb and Yukawa One‐Component plasmas. These data allows for a precise assessment of the coupling strength of experiments and simulations via a structural measurement and give a benchmark for analytical models. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-11-27T07:20:09.298594-05:
      DOI: 10.1002/ctpp.201400063
       
  • Self‐Organization in Dense Plasmas: The Gamma‐Plateau
    • Authors: J. Clérouin; Ph. Arnault, G. Robert, C. Ticknor, J. D. Kress, L. A. Collins
      Pages: n/a - n/a
      Abstract: When heated at constant volume (isochoric heating) a hot and dense plasma (10‐5000 eV, 1‐50 g/cm3) exhibits the same persistent microscopic structure over a wide range of temperatures as intuited long time ago by Laughlin [1]. In this steady‐state regime, which depends on the chosen density and on the atomic number, the static structure is essentially independent of the temperature and results in the subtle balance between ionization and temperature leading to a constant coupling between ions. This behavior, suggested by simulations, is confirmed by an analysis in the framework of the Thomas‐Fermi scaling laws and is driven by the ionization dynamics which regulates the coupling between ions and electrons. A simple fit is derived allowing for predicting the occurrence of this self‐organized regime: the Γ‐plateau. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-11-27T07:20:08.217253-05:
      DOI: 10.1002/ctpp.201400064
       
  • Toward a Nonequilibrium Green Functions Approach to Diffusion in Strongly
           Coupled Finite Quantum Systems
    • Authors: M. Bonitz; N. Schlünzen, S. Hermanns
      Pages: n/a - n/a
      Abstract: Transport properties of strongly correlated quantum systems are of central interest in condensed matter, ultracold atoms and in dense plasmas. There, the proper treatment of strong correlations poses a great challenge to theory. Here, we apply a Nonequilibrium Green Functions approach using a lattice model as a basic system. This allow us to treat a finite spatially inhomogeneous system with an arbitrary nonequilibrium initial state. Placing all particles initially to one side of the system allows for a nonequilibrium study of diffusion. Strong correlation effects are incorporated via T‐matrix selfenergies. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-11-27T07:20:06.885232-05:
      DOI: 10.1002/ctpp.201400065
       
  • Effective Potential Theory: A Practical Way to Extend Plasma Transport
           Theory to Strong Coupling
    • Authors: S.D. Baalrud; K. Ø. Rasmussen, J. Daligault
      Pages: n/a - n/a
      Abstract: The effective potential theory is a physically motivated method for extending traditional plasma transport theories to stronger coupling. It is practical in the sense that it is easily incorporated within the framework of the Chapman‐Enskog or Grad methods that are commonly applied in plasma physics and it is computationally efficient to evaluate. The extension is to treat binary scatterers as interacting through the potential of mean force, rather than the bare Coulomb or Debye‐screened Coulomb potential. This allows for aspects of many‐body correlations to be included in the transport coefficients. Recent work has shown that this method accurately extends plasma theory to orders of magnitude stronger coupling when applied to the classical one‐component plasma model. The present work shows that similar accuracy is realized for the Yukawa one‐component plasma model and it provides a comparison with other approaches. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-11-27T07:20:05.501046-05:
      DOI: 10.1002/ctpp.201400084
       
  • Issue Information Picture: Contrib. Plasma Phys. 10/2014
    • Pages: n/a - n/a
      PubDate: 2014-11-19T07:41:50.707829-05:
      DOI: 10.1002/ctpp.201490015
       
  • Cover Picture: Contrib. Plasma Phys. 10/2014
    • Pages: n/a - n/a
      Abstract: Spatio‐temporal evolution of electron density at 6 microseconds under f = 20 kHz, εr = 9.0, RC = 5.0 × 10–6 cm3 s–1 and Vappl = 1.7 kV with 50 ppm N2 impurities in He‐N2 gas. (Figure 3e of the paper by M.M. Iqbal and M.M. Turner)
      PubDate: 2014-11-19T07:41:50.655822-05:
      DOI: 10.1002/ctpp.201490014
       
  • A Critique of Recent Semi‐Classical Spin‐Half Quantum Plasma
           Theories
    • Authors: G. S. Krishnaswami; R. Nityananda, A. Sen, A. Thyagaraja
      Pages: n/a - n/a
      Abstract: Certain recent semi‐classical theories of spin‐half quantum plasmas are examined with regard to their internal consistency, physical applicability and relevance to fusion, astrophysical and condensed matter plasmas. It is shown that the derivations and some of the results obtained in these theories are internally inconsistent and contradict well‐established principles of quantum and statistical mechanics, especially in their treatment of fermions and spin. Claims of large semi‐classical effects of spin magnetic moments that could dominate the plasma dynamics are found to be invalid both for single‐particles and collectively. Larmor moments dominate at high temperature while spin moments cancel due to Pauli blocking at low temperatures. Explicit numerical estimates from a variety of plasmas are provided to demonstrate that spin effects are indeed much smaller than many neglected classical effects. The analysis presented suggests that the aforementioned ‘Spin Quantum Hydrodynamic’ theories are not relevant to conventional laboratory or astrophysical plasmas. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-11-12T07:40:10.44444-05:0
      DOI: 10.1002/ctpp.201400043
       
  • Contents: Contrib. Plasma Phys. 10/2014
    • Pages: 813 - 814
      PubDate: 2014-11-19T07:41:51.745965-05:
      DOI: 10.1002/ctpp.201410007
       
  • Quantum Binary and Triplet Distribution Functions of Plasma by using
           Green's Function
    • Authors: N. A. Hussein; D. A. Eisa, A.‐N. A. Osman, R. A. Abbas
      Pages: 815 - 826
      Abstract: The aim of this paper is to calculate the binary and triplet distribution functions for one and two component Plasmas in terms of Green's function technique. We obtained the triplet distribution function in two form; one of them is based on the Kirkwood Superposition Approximation (KSA) which is consisting of the assumption that the potential in a set of three particles is the sum of the three pair potentials, this is equivalent to assuming that the triplet distribution function is the product of the three binary distribution functions, but the other form is calculated from BBGKY hierarchy. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-11-19T07:41:50.81382-05:0
      DOI: 10.1002/ctpp.201400016
       
  • Determination of N and O‐atoms and N2 (A) Metastable Molecule
           Densities in the Afterglows of N2‐H2, Ar‐N2‐H2 and
           Ar‐N2‐O2 Microwave Discharges
    • Authors: H. Zerrouki; A. Ricard, J. P. Sarrette
      Pages: 827 - 837
      Abstract: Early afterglows of N2‐H2, Ar‐N2‐H2 and Ar‐N2‐O2 flowing microwave discharges are characterized by optical emission spectroscopy. The N and O atoms and the N2 (A) metastable molecule densities are determined by optical emission spectroscopy after calibration by NO titration for N and O‐atoms and measurements of NO and N2 band intensities. If an uncertainty of 30% is estimated on N‐atomic density, an inaccuracy of one order of magnitude is obtained on the O and N2 (A) densities. In N2‐(0.05‐2.5%)H2 and Ar‐(1‐50%)N2‐(0.05‐2.5%) H2 gas mixtures, the O‐atoms are coming from O2 impurities in the discharge. Concentrations of N and O‐atoms and of N2 (A) densities are compared to the ones obtained in Ar‐(5‐50%)N2‐(0.2‐2.5%) O2 gas mixtures in which a controlled amount of O2 is added. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-11-19T07:41:52.043917-05:
      DOI: 10.1002/ctpp.201400001
       
  • Global Numerical Model for the Assessment of the Effect of Geometry and
           Operation Conditions on Insert and Orifice Region Plasmas of a Thermionic
           Hollow Cathode Electron Source
    • Authors: O. Korkmaz; M. Celik
      Pages: 838 - 850
      Abstract: Thermionic hollow cathodes have been widely used in wide variety of areas such as spacecraft electric propulsion systems, material processing and lasers for more than half a century as efficient electron sources. Especially in electric propulsion systems, hollow cathodes are being used as electron sources for propellant ionization and ion beam neutralization. Moreover, it is also a promising candidate for utilization as a stand‐alone propulsion system in microsatellites or nanosatellites due to its small physical size, low power consumption and ease of operation. On the other hand, the small geometry of the typical orificed hollow cathodes makes the plasma diagnostics difficult which is why numerical studies become important for understanding the driving physical processes behind their operation, and the effects of the geometry and the operation parameters on cathode performance. In this paper, a global numerical model for the insert and orifice plasma of a hollow cathode is presented where volume averaged plasma parameters are considered for both regions. The results of this study show that the developed model can be used for designing and sizing orificed hollow cathodes as comparisons with the results of experimental and other numerical studies are in good agreement with the ones obtained from the developed model. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-11-19T07:41:50.339329-05:
      DOI: 10.1002/ctpp.201400036
       
  • Electrical Modelling of a Positive Point to Plane Corona Discharge at
           Atmospheric Pressure
    • Authors: D. Raouti; S. Flazi, D. Benyoucef
      Pages: 851 - 858
      Abstract: In this paper, we present a contribution to the electrical modelling of corona discharges in point to plane positive dry air at atmospheric pressure. An equivalent circuit model of the discharge is proposed and the evolution of equivalent electrical parameters is obtained using a mathematical method of identification based on the Recursive Least Square (RLS) algorithm. A comparison between the forms of measured discharge current and calculated model currents shows a good agreement and validates the model as well as the method. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-11-19T07:41:51.277863-05:
      DOI: 10.1002/ctpp.201400031
       
  • Coulomb Crystals with Isotopic Impurities
    • Authors: A. A. Kozhberov; D. A. Baiko
      Pages: 859 - 867
      Abstract: Vibration modes and thermodynamic properties of a body‐centered cubic (bcc) Coulomb crystal with a small admixture of substitutional isotopic impurities are studied analytically applying the perturbation theory of disordered crystal spectra and the Lifshitz‐Krein trace formula. We calculate the density of phonon states of the perfect bcc Coulomb crystal and use it to compute the heat capacity of the crystal with impurities in a wide range of temperatures. It is shown that the ratio of an impurity contribution to the crystal heat capacity over the perfect crystal specific heat tends to a constant in the low‐temperature quantum regime and decays as T–2 in the classic regime of high temperatures. It is also shown that even a small concentration of heavy impurities amplifies significantly the total crystal heat capacity. The results are compared with those obtained using the more conventional linear mixing theory. It is demonstrated that both methods give similar results at all tempera‐tures when the impurity mass is not too different from that of the base ions but a strong discrepancy is observed at low and intermediate temperatures when impurities are noticeably lighter or heavier. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-11-19T07:41:51.54698-05:0
      DOI: 10.1002/ctpp.201400034
       
  • Broad‐Band Time‐Resolved Near Infrared Spectroscopy in the
           TJ‐II Stellarator
    • Authors: M. C. Rodriguez; I. Pastor, E. de la Cal, K. J. McCarthy, D. Diaz
      Pages: 868 - 876
      Abstract: First experimental results on broad‐band, time‐resolved Near Infrared (NIR;here loosely defined as covering from 750 to 1650 nm) passive spectroscopy using a high sensitivity InGaAs detector are reported for the TJ‐II Stellarator. Experimental set‐up is described together with its main characteristics, the most remarkable ones being its enhanced NIR response, broadband spectrum acquisition in a single shot, and time‐resolved measurements with up to 1.8 kHz spectral rate. Prospects for future work and more extended physics studies in this newly open spectral region in TJ‐II are discussed. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-11-19T07:41:51.01075-05:0
      DOI: 10.1002/ctpp.201400045
       
  • Dust in Plasma II. Effects of Secondary Electrons: Ionization and Surface
           Emission
    • Authors: F. Taccogna; G. Mizzi
      Pages: 877 - 888
      Abstract: In this second paper, the effect of secondary electrons on the charge and potential of a dust particle immersed in plasma has been studied. The processes of electron‐induced ionization and those of photo‐electron and secondary electron emission from the particle surface as a function of primary electron temperature have been taken into account. Starting from temperatures as low as 6 eV in an Ar plasma, ionization produces an extra ion flux to the dust surface comparable to that of the ion charge exchange effect. For what concerns the surface emission, results show that a transition from negative to positive dust charge/potential takes place, and that the transition regime is characterized by a non‐monotonic behavior of the electric potential around the particle. In the case of photoelectric emission, the dust charge and potential are monotonic decreasing functions of the electron temperature, while in the case of emission induced by primary electrons a minimum charge/potential is reached before they grow towards positive values. In no case multiple dust charge states have been observed due to the presence of the potential well attached to the particle surface. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
      PubDate: 2014-11-19T07:41:51.818466-05:
      DOI: 10.1002/ctpp.201400040
       
  • Nonlinear Transport Processes in Non‐Ideal Media
    • Abstract: The theory of non‐linear transport is elaborated to determine the Burnett transport properties of non‐ideal multielement plasma and neutral systems. The procedure of the comparison of the phenomenological conservation equations of a continuous dense medium and the microscopic equations for dynamical variables operators in the form of the generalized nonlinear Langevin equations is used for the definition of these properties. In consequence, the microscopic expressions of transport coefficients corresponding to second order thermal disturbances (temperature, mass velocity, etc.) have been found in the long‐wavelength and low frequency limits of correlations functions. Situations are considered when the use of nonlinear transport characteristics (in the Burnett approximation) significantly affects the results of modeling of hydrodynamic processes in dense charged and neutral media. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
       
 
 
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