End-on x-ray backlighting experiments for axial diagnostics of wire-array Z-pinch plasma on PPG-1  

作　　者：Shen Zhao Xinlei Zhu Huantong Shi Xiaobing Zou Xinxin Wang 赵屾;朱鑫磊;石桓通;邹晓兵;王新新(Department of Electrical Engineering,Tsinghua University;Shenzhen Institutes of Advanced Technology,Chinese Academy of Sciences)

机构地区：[1]Department of Electrical Engineering, Tsinghua University, Beijing 100084, China [2]Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China

出　　处：《Chinese Physics B》2017年第1期326-332,共7页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11177086 and 51177086);Guangdong Innovative Research Team Program of China(Grant No.2011S013);the National Key Research and Develop Program of China(Grant No.2016YFC0105102);the National Basic Research Program of China(Grant Nos.2012AA02A604 and 2015AA043203);Beijing Center for Mathematics and Information Interdisciplinary Sciences,China

摘　　要：An X-pinch axial backlighting system has been designed to quantitatively measure the density distribution of wirearray Z-pinch plasmas. End-on backlighting experiments were carried out on a 200 kA, 100 ns pulsed-power generator（PPG-1） at the Tsinghua University. Compared with side-on backlighting, end-on measurements provide an axial view of the evolution of Z-pinch plasmas. Early stages of 2-, 4-, and 8-wire Z-pinch plasmas were observed via point-projection backlighting radiography with a relatively high success rate. The density distribution of Z-pinch plasma on the r–θ plane was obtained directly from the images with the help of step wedges, and the inward radial velocity was calculated. The ablation rates obtained by X-pinch backlighting experiments are compared in detail with those calculated by the rocket model and the results show consistency.An X-pinch axial backlighting system has been designed to quantitatively measure the density distribution of wirearray Z-pinch plasmas. End-on backlighting experiments were carried out on a 200 kA, 100 ns pulsed-power generator（PPG-1） at the Tsinghua University. Compared with side-on backlighting, end-on measurements provide an axial view of the evolution of Z-pinch plasmas. Early stages of 2-, 4-, and 8-wire Z-pinch plasmas were observed via point-projection backlighting radiography with a relatively high success rate. The density distribution of Z-pinch plasma on the r–θ plane was obtained directly from the images with the help of step wedges, and the inward radial velocity was calculated. The ablation rates obtained by X-pinch backlighting experiments are compared in detail with those calculated by the rocket model and the results show consistency.

关 键 词：X-pinches axial backlighting wire-array Z-pinches 

分 类 号：O53[理学—等离子体物理] O434.1[理学—物理]