Hot-Electron Generation from Laser/Pre-Plasma Interactions in Cone-Guided Fast Ignition
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چکیده
LLE Review, Volume 134 127 Introduction The cone-guided scheme for fast-ignition inertial confinement fusion (ICF)1,2 provides the potential of higher gains at lower total driver energy than conventional central hot-spot–ignition schemes. In this scheme, a spherical target with a hollow gold cone attached is first compressed by laser beams outside the cone and then ignited by a petawatt (PW) short ignition pulse launched into the cone. The cone keeps the plasma out during the compression so that the ignition pulse can reach the cone tip and generate MeV electrons close to the assembled fuel core. Given the angular spread of laser-generated hot electrons, keeping the hot-electron source closer to the assembled core is important to the success of fast ignition. Early Gekko XII experiments with the cone-guided scheme showed good laser–core coupling.2,3 Recent scaled-up integrated experiments on OMEGA/ OMEGA EP showed, however, a lower coupling efficiency.4
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