A scheme for artificially collimating fast-electron beams produced in high intensity (>10¹⁹ W cm^-2) laser-solid interactions is proposed. The scheme uses a laser pulse at the relativistic threshold (≈10¹⁸ W cm^-2) that precedes the high intensity pulse to pregenerate a collimating magnetic field. This concept is supported by analytical calculations and numerical calculations performed using a novel hybrid-Vlasov-Fokker-Planck code called LEDA. This scheme may be highly useful for fast ignition inertial confinement fusion.
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Robinson et al. (2008) studied this question.
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