Characterization of an imploding cylindrical plasma for electron transport studies using x-ray emission spectroscopy
Characterization of an imploding cylindrical plasma for electron transport studies using x-ray emission spectroscopy
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DOI：
10.1063/1.5125271
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发表时间：
2020-02-01
影响因子：
2.2
通讯作者：
Beg, F. N.
中科院分区：
文献类型：
--
作者：
Dozieres, M.;Hansen, S.;Beg, F. N.
我们报告的表征条件的内爆圆柱形等离子体的时间分辨X射线发射光谱。关于这个内爆平台的知识可以应用于惯性约束聚变方案或天体物理等离子体的粒子输运研究。用36束OMEGA-60激光（I-总类似于5 × 10（14）W/cm（2），1.5ns方脉冲，E-总类似于16.2kJ）照射固体CH管内的圆柱形Cl掺杂CH泡沫，以朝向轴径向压缩CH。时间分辨光谱的分析表明，压缩可以描述为四个不同的阶段，每个阶段呈现不同的等离子体条件。首先，烧蚀的气缸是占主导地位的;第二，泡沫被加热，并引起显着的跳跃发射强度;第三，温度和密度的泡沫达到最大值;最后，等离子体膨胀。等离子体温度的范围推断与原子物理代码SCRAM（光谱碰撞辐射原子模型）和实验数据进行了比较，流体动力学模拟与2D代码FLASH，这表明了类似的内爆动态随时间的推移。
We report on the characterization of the conditions of an imploding cylindrical plasma by time-resolved x-ray emission spectroscopy. Knowledge about this implosion platform can be applied to studies of particle transport for inertial confinement fusion schemes or to astrophysical plasmas. A cylindrical Cl-doped CH foam within a tube of solid CH was irradiated by 36 beams (I-total similar to 5x10(14)W/cm(2), 1.5ns square pulse, and E-total similar to 16.2kJ) of the OMEGA-60 laser to radially compress the CH toward the axis. The analysis of the time-resolved spectra showed that the compression can be described by four distinct phases, each presenting different plasma conditions. First the ablation of the cylinder is dominant; second, the foam is heated and induces a significant jump in emission intensities; third, the temperature and density of the foam reaches a maximum; and finally, the plasma expands. Ranges for the plasma temperature were inferred with the atomic physics code SCRAM (Spectroscopic Collisional-Radiative Atomic Model) and the experimental data have been compared to hydrodynamic simulations performed with the 2D code FLASH, which showed a similar implosion dynamic over time.