Time-resolved, two-dimensional electron-temperature distribution of laser-imploded core plasmas
Time-resolved, two-dimensional electron-temperature distribution of laser-imploded core plasmas
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激光内爆核心等离子体的时间分辨二维电子温度分布
DOI：
10.1063/1.1147698
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发表时间：
1997
影响因子：
1.6
通讯作者：
K. Mima
中科院分区：
文献类型：
--
作者：
M. Heya;M. Nakasuji;H. Shiraga;N. Miyanaga;H. Azechi;H. Takabe;T. Yamanaka;K. Mima
我们已经开发了一种多通道，多成像X射线条纹相机技术，通过增加多通道光谱选择能力的多成像X射线条纹相机技术测量二维电子温度分布的高时间分辨率，并将其应用于直接驱动内爆实验在Gekko-XII激光装置的部分相干光。结果表明，激光内爆ICF靶芯等离子体中的电子温度分布具有以20 ps时间尺度变化的低模非均匀结构，且电子温度的突变出现在减速阶段。我们比较了实验观察到的X射线强度和电子温度的时间轮廓与一维流体动力学代码“ILESTA”预测的核心等离子体中的热火花加热的调查。
We have developed a multichannel, multiimaging x-ray streak camera technique to measure two-dimensional electron-temperature distributions with a high temporal resolution by adding a multichannel spectrum selection capability to a multiimaging x-ray streak camera technique, and applied it to direct-drive implosion experiments with partially coherent light at Gekko-XII laser facility. It was found that electron-temperature distributions in the laser-imploded core plasmas of ICF targets had low-mode nonuniform structures changing with a temporal scale of 20 ps, and the abrupt drop of the electron temperature appeared in the deceleration phase. We have compared temporal profiles of the experimentally observed x-ray intensity and electron-temperature with those predicted by a one-dimensional hydrodynamic code “ILESTA” to investigate the hot spark heating in the core plasmas.