Indirect-direct hybrid target experiments with the GEKKO XII laser
Indirect-direct hybrid target experiments with the GEKKO XII laser
复制标题
使用 GEKKO XII 激光器进行间接-直接混合靶标实验
DOI：
10.1088/0029-5515/40/3y/315
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发表时间：
2000
期刊：
影响因子：
3.3
通讯作者：
K. Mima
中科院分区：
文献类型：
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作者：
H. Nishimura;H. Shiraga;H. Azechi;N. Miyanaga;M. Nakai;N. Izumi;M. Nishikino;M. Heya;K. Fujita;Y. Ochi;K. Shigemori;N. Ohnishi;M. Murakami;K. Nishihara;R. Ishizaki;H. Takabe;K. Nagai;T. Norimatsu;M. Nakatsuka;T. Yamanaka;S. Nakai;C. Yamanaka;K. Mima
研究了一种新的聚变舱驱动方案。在主驱动脉冲之前，胶囊由低强度热X射线脉冲照射。这导致由于预形成的等离子体中的热平滑而对驱动光束的初始压印的显著抑制。在几种类型的间接-直接混合目标中，作者研究了两种类型的混合效应。一种是泡沫混合物，其中燃料舱具有直接附着在其表面上的低密度泡沫层，并且其中从泡沫上的薄的高Z层产生的脉冲辐射传播通过泡沫，产生预成型的等离子体。另一种是外部混合，其中胶囊由使用来自胶囊驱动光束的不同光束产生的外部X射线辐射照射。这两种类型的混合效应被证明是通过施加一个初始的印记在一个平面目标上的强度调制光束，随后的非均匀性增长，由于瑞利-泰勒不稳定性，观察到通过面对背光。观察到的抑制，由于存在的预成型等离子体的解释是由一个阴天模型的混合动力车。太空舱内爆实验也已经开始。观察到的整体内爆动力学复制的1-D流体动力学模拟。给出了内爆实验的初步结果。
A new fusion capsule drive scheme was investigated. The capsule is illuminated by a low intensity thermal X ray pulse prior to the main drive pulse. This leads to a noticeable suppression of initial imprinting by the drive beam because of thermal smoothing in the preformed plasma. Of the several types of indirect-direct hybrid target, the authors investigated the hybrid effect for two types. One is a foam hybrid, in which the fuel capsule has a low density foam layer attached directly on its surface and where pulsed radiation generated from a thin high Z layer on the foam propagates through the foam, creating a preformed plasma. The other is an external hybrid, in which the capsule is illuminated by external X ray radiation generated using different beams from the capsule drive beams. The hybrid effect was demonstrated for both types by imposing an initial imprint on a planar target with an intensity modulated beam, and subsequent non-uniformity growth due to Rayleigh-Taylor instability was observed by means of face-on backlighting. The observed suppression due to the presence of the preformed plasma is interpreted by a cloudy day model for both hybrids. Capsule implosion experiments have also been started. The overall implosion dynamics observed is replicated by 1-D hydrocode simulations. Preliminary results from the implosion experiments are presented.