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Gamma ray bursts (GRBs) are thought to originate from highly relativisticjets. The fireball model predicts internal shocks in the jets, causing magneticfield to be amplified and particles to be accelerated. We model the effects ofan asymmetric density configuration for an internal plasma collision in aquasi-parallel magnetic field. We measured electron acceleration and found thata tenuous population of electrons is accelerated to Lorentz factors of \sim 300- close to energy equipartition with ions. We found that the filaments did notremain static, but were deflected by the Lorentz force and rolled up into smallvortices, which themselves merge to form a larger current vortex.

Field amplification, vortex formation, and electron acceleration in a plasma protoshock: effect of asymmetric density profile