USE OF X-RAY PREHEATED FOAM LAYERS TO REDUCE BEAM STRUCTURE IMPRINT IN LASER-DRIVEN TARGETS

被引:103
作者
DESSELBERGER, M
JONES, MW
EDWARDS, J
DUNNE, M
WILLI, O
机构
[1] Blackett Laboratory, Imperial College of Science, Technology and Medicine
关键词
D O I
10.1103/PhysRevLett.74.2961
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A new direct-drive scheme is proposed, which substantially reduces initial laser-nonuniformity imprinting by surrounding conventional targets with a low-density foam jacket. The foam is ionized by a supersonic wave induced by a soft x-ray pulse prior to the arrival of the main optical drive. The variable-sized, supercritical foam plasma thus created acts to thermally smooth laser-drive structure. Hydrocode simulations are presented showing that the scheme is very effective at reducing target nonuniformities due to imprinting without significantly increasing target preheat and reducing hydrodynamic efficiency. © 1995 The American Physical Society.
引用
收藏
页码:2961 / 2964
页数:4
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