X-ray preheat shield in laser direct-drive ramp compression experiments

被引：1
|
作者：
Xue, Quanxi [1 ,2 ]
Jiang, Shaoen [1 ]
Wang, Zhebin [1 ]
Wang, Feng [1 ]
Liu, Yanpeng [2 ]
Zhao, Xueqing [2 ]
Ding, Yongkun [1 ]
机构：
[1] China Acad Engn Phys, Res Ctr Laser Fusion, Mianyang 621900, Peoples R China
[2] Northwest Inst Nucl Technol, State Key Lab Laser Interact Matter, Xian 710024, Shaanxi, Peoples R China
来源：
AIP ADVANCES | 2019年 / 9卷 / 03期
基金：
中国国家自然科学基金;
关键词：
DIAMOND; MODEL;
D O I：
10.1063/1.5053226
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Laser drive ramp compression is an important method to achieve an extremely high-pressure but relatively low-temperature material state. In this study, we found VISAR streaks disappearing under high pressure. To solve this problem, the mechanism of probe-laser absorption in laser drive ramp compression experiments has been studied, and X-ray preheat is found to be the main factor in this mechanism. Subsequently, target configuration optimization and code simulation were performed based on previous experiments, and laser drive ramp compression experiments were performed on the SHENGGUANG prototype facility. In the experiments, the probe-laser reflectivity was above 90% at 450 GPa, which is much higher than those in previous experiments, demonstrating that the X-ray preheat was shielded well with the optimized target configuration. (C) 2019 Author(s).
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页数：6
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