Numerical performance assessment of double-shell targets for Z-pinch dynamic hohlraum
Numerical performance assessment of double-shell targets for Z-pinch dynamic hohlraum
复制标题
Z 箍缩动态空腔双壳靶的数值性能评估
DOI：
10.1063/5.0079074
复制
发表时间：
2022-05-01
影响因子：
5.1
通讯作者：
Li, Z. H.
中科院分区：
文献类型：
--
作者：
Chu, Y. Y.;Wang, Z.;Li, Z. H.
Z箍缩动态黑腔可以产生间接驱动惯性约束聚变所需的高温辐射场。根据动态黑腔辐射温度与驱动电流的标度关系，采用大于50 MA的Z箍缩驱动器，可以获得峰值辐射温度超过300 eV的动态黑腔。基于宽度为10 ns的均匀300 eV辐射温度分布，提出了半径为2，2.5和3 mm的三种双壳层胶囊，从一维计算得到相应的聚变产额为28.8，56.1和101.6 MJ。详细研究了半径为2.5 mm的密封舱的内爆动力学。根据一维模拟，在点火时，燃料的面密度约为0.53 g/cm（2），燃料压力约为80 Gbar，中心离子温度约为4.5 keV。二维模拟结果表明，在Z箍缩动态黑腔辐射场驱动下，双壳层胶囊可以发生近球形内爆。通过一维模拟研究了聚变性能对辐射温度分布和胶囊参数偏差的敏感性，发现胶囊聚变产额在相当大的参数空间内是相当稳定的。对嵌入50 mg/cm（3）CH泡沫中的胶囊的一维模拟表明，在Z箍缩动态黑腔的模拟环境中，胶囊的性能不会发生很大变化。如果激光装置能产生300 eV的均匀辐射场并维持约10 ns，则本文设计的双壳胶囊也适用于激光间接驱动惯性聚变。(C)2022年作者。
A Z-pinch dynamic hohlraum can create the high-temperature radiation field required by indirect-drive inertial confinement fusion. A dynamic hohlraum with peak radiation temperature over 300 eV can be obtained with a > 50 MA Z-pinch driver according to the scaling law of dynamic hohlraum radiation temperature vs drive current. Based on a uniform 300 eV radiation temperature profile with a width of 10 ns, three double-shell capsules with radii of 2, 2.5, and 3 mm are proposed, and the corresponding fusion yields from a one-dimensional calculation are 28.8, 56.1, and 101.6 MJ. The implosion dynamics of the 2.5 mm-radius capsule is investigated in detail. At ignition, the areal density of the fuel is about 0.53 g/cm(2), the fuel pressure is about 80 Gbar, and the central ion temperature is about 4.5 keV, according to the one-dimensional simulation. A two-dimensional simulation indicates that the double-shell capsule can implode nearly spherically when driven by the radiation field of a Z-pinch dynamic hohlraum. The sensitivities of the fusion performance to the radiation temperature profiles and to deviations in the capsule parameter are investigated through one-dimensional simulation, and it is found that the capsule fusion yields are rather stable in a quite large parameter space. A one-dimensional simulation of a capsule embedded in 50 mg/cm(3) CH foam indicates that the capsule performance does not change greatly in the mimicked environment of a Z-pinch dynamic hohlraum. The double-shell capsules designed here are also applicable to laser indirect-drive inertial fusion, if a laser facility can produce a uniform 300 eV radiation field and sustain it for about 10 ns. (C) 2022 Author(s).