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The double laser pulse approach to relativistic electron beam (REB)collimation has been investigated at the LULI-ELFIE facility. In this scheme,the magnetic field generated by the first laser-driven REB is used to guide asecond delayed REB. We show how electron beam collimation can be controlled byproperly adjusting laser parameters. By changing the ratio of focus size andthe delay time between the two pulses we found a maximum of electron beamcollimation clearly dependent on the focal spot size ratio of the two laserpulses and related to the magnetic field dynamics. Cu-K alpha and CTR imagingdiagnostics were implemented to evaluate the collimation effects on therespectively low energy (< 100 keV) and high energy (> MeV) components of theREB.

Enhanced relativistic-electron beam collimation using two consecutive laser pulses