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Physics of Plasmas / Volume 19 / Issue 2 / ARTICLES / Nonlinear Phenomena, Turbulence, Transport

Phys. Plasmas 19, 022302 (2012); http://dx.doi.org/10.1063/1.3676632 (8 pages)

Simulation studies of positron acceleration in a shock wave in a nonuniform external magnetic field

Takashi Iwata, Seiichi Takahashi, and Yukiharu Ohsawa

Department of Physics, Nagoya University, Nagoya 464-8602, Japan

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(Received 30 August 2011; accepted 5 December 2011; published online 3 February 2012)

Positron acceleration in a shock wave in an electron-positron-ion plasma is studied with one-dimensional, fully kinetic, electromagnetic particle simulations, with particular attention paid to the effect of inhomogeneity of external magnetic field B0. First, acceleration to γ ∼ 104, where γ is the Lorentz factor, is demonstrated for a shock wave in a uniform B0 with the shock speed νsh close to c cos θ, where c is the speed of light and θ is the angle between B0 and the wave normal. The acceleration is not saturated till the end of the simulation run. Then, the effect of nonuniformity of B0 is investigated: Comparisons are made between the case in which the difference (νsh − c cos θ) at the shock front changes from negative to positive values as the shock wave propagates and the case with this relation reversed. The latter is found to create a greater number of high-energy particles than the former.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. CONSIDERATIONS ON THE EFFECT OF INHOMOGENEITY ON POSITRON ACCELERATION
  3. SIMULATION STUDIES OF POSITRON ACCELERATION IN NONUNIFORM EXTERNAL MAGNETIC FIELD
    1. Uniform external magnetic field
    2. Increasing B z0
    3. Decreasing B z0
  4. SUMMARY

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KEYWORDS and PACS

Keywords

plasma electromagnetic wave propagation, plasma kinetic theory, plasma shock waves, plasma simulation, plasma transport processes

PACS

  • 52.35.Tc

    Shock waves and discontinuities

  • 52.40.Db

    Electromagnetic (nonlaser) radiation interactions with plasma

  • 52.65.-y

    Plasma simulation

  • 52.25.Dg

    Plasma kinetic equations

  • 52.25.Fi

    Transport properties

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3676632

PUBLICATION DATA

ISSN

1070-664X (print)  
1089-7674 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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