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Long-distance collimation of fast electron beams generated bylaser-metallic-wire targets has been observed in recent experiments, while themechanism behind this phenomenon remains unclear. In this work, we investigatein detail the laser-wire interaction processes with a simplified model andClassical Trajectory Monte Carlo simulations, and demonstrate the significanceof the self magnetic fields of the beams in the long-distance collimation. Goodagreements of simulated image plate patterns with various experiments anddetailed analysis of electron trajectories show that the self magnetic fieldsprovide restoring force that is critical for the beam collimation. By studyingthe wire-length dependence of beam divergence in certain experiments, weclarify that the role of the metallic wire is to balance the space-chargeeffect and thus maintain the collimation.

Significance of self magnetic field in long-distance collimation of laser-generated electron beams