Implosion of indirectly driven reentrant-cone shell target.
Implosion of indirectly driven reentrant-cone shell target.
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DOI：
10.1103/physrevlett.91.185001
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发表时间：
2003-10
影响因子：
8.6
通讯作者：
R. Stephens;S. Hatchett;R. Turner;Kazuo A. Tanaka;Ryosuke Kodama
中科院分区：
文献类型：
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作者：
R. Stephens;S. Hatchett;R. Turner;Kazuo A. Tanaka;Ryosuke Kodama
我们研究了一个间接驱动的再入锥壳靶的内爆，以澄清压缩燃料用于快速点火靶的问题。目标设计是一个NIF低温点火目标的流体动力学等效缩放到由Omega驱动。内爆用背光x射线成像，用LASNEX建模。在壳直径、密度和对称性等方面，模拟结果与实验结果基本一致，但未出现滞止前中心吸收最大值。原锥体与壳体之间存在的物质对金m波段辐射敏感，辐射穿透壳体，将锥体中的金烧蚀。使用最近测量的m波段分数的模拟x射线片显示锥和壳之间的吸收与实验相似。这种金烧蚀在低温点火靶中可能是个问题。
We have examined the implosion of an indirectly driven reentrant-cone shell target to clarify the issues attendant on compressing fuel for a fast ignition target. The target design is the hydrodynamic equivalent of a NIF cryoignition target scaled to be driven by Omega. Implosions were imaged with backlit x radiographs and modeled with LASNEX. The simulations were generally in good agreement with the experiments with respect to the shell diameter, density, and symmetry, but did not show the prestagnation central absorption maximum. The existence of material between the original cone and the shell is sensitive to gold M-band radiation, which penetrates the shell and ablates gold from the cone. The simulated radiographs using recently measured M-band fractions showed absorption between the cone and shell similar to the experiment. This gold ablation might be a problem in a cryoignition target.