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The plasma dynamics resulting from the simultaneous impact, of two equal,ultra-intense laser pulses, in two spatially separated spots, onto a densetarget is studied via particle-in-cell (PIC) simulations. The simulations showthat electrons accelerated to relativistic speeds, cross the target and exit atits rear surface. Most energetic electrons are bound to the rear surface by theambipolar electric field and expand along it. Their current is closed by areturn current in the target, and this current configuration generates strongsurface magnetic fields. The two electron sheaths collide at the midplanebetween the laser impact points. The magnetic repulsion between thecounter-streaming electron beams separates them along the surface normaldirection, before they can thermalize through other beam instabilities. Thismagnetic repulsion is also the driving mechanism for the beam-Weibel(filamentation) instability, which is thought to be responsible for magneticfield growth close to the internal shocks of gamma-ray burst (GRB) jets. Therelative strength of this repulsion compared to the competing electrostaticinteractions, which is evidenced by the simulations, suggests that thefilamentation instability can be examined in an experimental setting.

Simulation of relativistically colliding laser-generated electron flows