Magnetically guided fast electrons in cylindrically compressed matter.
2011
Fast electrons produced by a 10 ps, 160 J laser pulse through
laser-compressed plastic cylinders are studied experimentally and
numerically in the context of fast ignition. K(alpha)-emission images
reveal a collimated or scattered electron beam depending on the initial
density and the compression timing. A numerical transport model shows
that implosion-driven electrical resistivity gradients induce strong
magnetic fields able to guide the electrons. The good agreement with
measured beam sizes provides the first experimental evidence for
fast-electron magnetic collimation in laser-compressed matter.
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