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 B 0 . First, acceleration to γ ∼ 10 4 , where γ is the Lorentz factor, is demonstrated for a shock wave in a uniform B 0 with the shock speed ν sh close to c cos θ , where c is the speed of light and θ is the angle between B 0 and the wave normal. The acceleration is not saturated till the end of the simulation run. Then, the effect of nonuniformity of B 0 is investigated: Comparisons are made between the case in which the difference ( ν sh - 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.
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Simulation studies of positron acceleration in a shock wave in a nonuniform external magnetic field
Iwata, Takashi; Takahashi, Seiichi; Ohsawa, Yukiharu
Follow Physics of Plasmas
, Volume 19 (2)
American Institute of Physics – Feb 1, 2012
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