Hot electron emission limited by self-excited ?elds fromtargets irradiated by ultra-intense laser pulses

摘要

A large number of hot electrons exceeding the Alfv′en current can be produced when an ultraintensernlaser pulse irradiates a solid target. Self-excited electrostatic and magnetic ?elds at the target rearrncould in?uence the hot electron transport. To investigate the in?uence, we measure the hot electrons when arnpre-plasma is created on the target rear surface and verify an increase of the electron number by a factor ofrn2 comparing to the no rear plasma case. The increase may be caused because of changes in the electrostaticrnpotential formation process. The retardation of the potential formation is shown using a particle-in-cellrnsimulation. The electron number escaping within the retardation time duration is consistent with ourrnestimation taking the Alfv′en current into account.