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Volume 71 - Issue 1 - February 2005

Journal of Plasma Physics Volume 71 - Issue 1 -
Contents

Editorial

  • Editorial
  • Alan Cairns
  • Published online by Cambridge University Press: 13 January 2005, p. i
    • Article
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    • NASA ADS Abstract Service

Papers

  • A study of ion-acoustic solitons and double layers in a multispecies collisionless weakly relativistic plasma
  • TARSEM SINGH GILL, HARVINDER KAUR, NARESHPAL SINGH SAINI
  • Published online by Cambridge University Press: 13 January 2005, pp. 23-34
  • View abstract

    The effect on the propagation of ion-acoustic solitons and double layers has been studied in collisionless weakly relativistic plasma consisting of two-electron temperature with isothermal electrons and finite ion temperature. The Korteweg de-Vries (KdV) equation is derived for ion-acoustic solitons propagating in a collisionless plasma. This equation is solved in a stationary frame to obtain the expression for soliton phase velocity, soliton width and peak soliton amplitude. It is observed that these quantities are significantly influenced by the relativistic effect, ion temperature, low-temperature electron density and ratio of cold to hot electron temperatures. Many features expected from hot ion theory and two species electron plasmas automatically emerge. The analysis is further extended to higher order nonlinearity and modified Korteweg de-Vries (mKdV) equation is derived. Even though compressive and rarefactive ion-acoustic solitons are obtained, only rarefactive ion-acoustic double layers are obtained in the present investigation.

  • Computations for nonlinear force driven plasma blocks by picosecond laser pulses for fusion
  • Y. CANG, F. OSMAN, H. HORA, J. ZHANG, J. BADZIAK, J. WOLOWSKI, K. JUNGWIRTH, K. ROHLENA, J. ULLSCHMIED
  • Published online by Cambridge University Press: 13 January 2005, pp. 35-51
  • View abstract

    The concept of the fast ignitor for laser fusion has led to some modifications in applying petawatt-picosecond (PW-ps) laser-produced high intensity particle beams to ignite deuterium-tritium (DT) fuel. Some very anomalous measurements of ion emission from targets irradiated by picosecond laser pulses led to the development of a skin depth interaction scheme where a defined control of prepulses is necessary. Based on these experimental facts, we have applied a one-dimensional two-fluid hydrodynamic code to understand how the nonlinear ponderomotive force generates two plasma blocks, one moving against the laser light (ablation) and the other moving into the target. This compressed block produces an ion current density of above 10$^{11}$ A cm$^{-2}$ and an ion energy of about 100 keV. This may be a rather promising option to use PW-ps laser pulses for igniting fusion in solid density DT fuel, realizing very high gain controlled fusion reactions.

  • The magnetic entropy concept
  • E. MINARDI
  • Published online by Cambridge University Press: 13 January 2005, pp. 53-80
  • View abstract

    The magnetic entropy concept is an interpretative and predictive tool based on probability and information, defined in a suitably coarse-grained possibility space of all current density distributions under testable constraints. This paper develops the concept starting from its statistical foundations and then proceeds illustrating its potentiality in the description of the global behavior of macroscopic plasma configurations with practical interest. Finally, the paper discusses the relations of the concept to the dynamics of the underlying system of particles.