Optimization of tungsten-doped high density carbon target in inertial confinement fusion
Optimization of tungsten-doped high density carbon target in inertial confinement fusion
复制标题
惯性约束聚变掺钨高密度碳靶的优化
DOI：
10.1088/1741-4326/ac2871
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发表时间：
2021-12-01
期刊：
影响因子：
3.3
通讯作者：
Zhang, Baohan
中科院分区：
文献类型：
--
作者：
Li, Liling;Zhang, Wenhai;Zhang, Baohan
掺钨高密度碳（HDC）靶是惯性约束聚变（ICF）点火靶的一种很有前途的设计。实验研究了硅和钨对M波段X射线透射的影响。在辐照温度为200 eV的条件下，用M-XRD和TGS分别测量了Si和W埋层HDC样品的M波段X射线（1.6-4.4 keV）透过通量和能谱。Si或W的薄层被埋在两个不同的深度（2.1 μm和11 μm）。结果表明，硅埋层HDC样品的M带透射通量随埋层深度（bd）的增加而减小。然而，bd不影响W-掩埋HDC样品的bd。一维模拟结果与实验结果一致。在一维模拟中，Si埋层HDC的Au M波段（2-5 keV）传输通量也随bd的增大而减小。而W埋层HDC的Au M带传输通量则呈现先增大后减小的趋势。这主要是由于Si和W不透明度的不同特性。特别是当峰值辐射温度达到260 eV时，W仍然可以有效地吸收M波段X射线，因为它被埋在辐射源附近。在此基础上，本文提出了一种低掺杂分数和低质量的优化的掺W HDC靶。
A tungsten (W)-doped high density carbon (HDC) target is a promising design for an ignition target in inertial confinement fusion (ICF). The influence of silicon (Si) and W on the transmission of M-band x-ray has been studied by experiment. With a radiation temperature of ∼200 eV, the transmitted M-band x-ray (1.6–4.4 keV) flux and spectrum of Si or W-buried HDC sample were measured by M-XRDs and TGS, respectively. The thin layer of Si or W was buried at two different depths (2.1 μm and 11 μm). Results show that M-band transmission flux of Si-buried HDC sample decreases with buried depth (bd). However, bd does not influence that of the W-buried HDC sample. The one-dimensional simulation result is consistent with the experimental result. In the 1D simulation, the Au M-band (2–5 keV) transmission flux of Si-buried HDC also decreases with bd. However, the Au M-band transmission flux of W-buried HDC increases at first and then decreases. This is mainly due to the different characteristics of Si and W opacity. Especially as the peak radiation temperature reaches 260 eV, W can still absorb the M-band x-ray efficiently as it is buried near the radiation source. Based on these studies, an optimized W-doped HDC target with low doped fraction and mass has been proposed in this paper.