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Magnetically guided fast electrons in cylindrically compressed matter
Authors:Pérez F  Debayle A  Honrubia J  Koenig M  Batani D  Baton S D  Beg F N  Benedetti C  Brambrink E  Chawla S  Dorchies F  Fourment C  Galimberti M  Gizzi L A  Gremillet L  Heathcote R  Higginson D P  Hulin S  Jafer R  Koester P  Labate L  Lancaster K L  MacKinnon A J  MacPhee A G  Nazarov W  Nicolai P  Pasley J  Ramis R  Richetta M  Santos J J  Sgattoni A  Spindloe C  Vauzour B  Vinci T  Volpe L
Institution:LULI, école Polytechnique, CNRS, CEA, UPMC, Palaiseau, France. frederic.perez@polytechnique.edu
Abstract: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(α)-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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