Particle simulation of an ultrarelativistic two-stream instability |
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Authors: | Dieckmann M E |
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Affiliation: | Department of Theoretical Space and Astrophysics, Ruhr-University Bochum, 44780 Bochum, Germany. |
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Abstract: | A two-stream instability in an unmagnetized plasma is examined by a particle-in-cell simulation. Each beam initially consists of cold electrons and protons that stream at a relative Lorentz factor 100. This is representative for plasma close to the external shocks of gamma-ray bursts. An electrostatic wave develops which saturates by trapping electrons. This wave collapses and the resulting electrostatic turbulence gives an electron momentum distribution that resembles a power law with a spectral break. Some electrons reach Lorentz factors over 1000. |
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