Preliminary investigation on electrothermal instabilities in early phases of cylindrical foil implosions on primary test stand facility

doi:10.1088/1674-1056/28/2/025203

中国物理B ›› 2019, Vol. 28 ›› Issue (2): 25203-025203.doi: 10.1088/1674-1056/28/2/025203

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇下一篇

Preliminary investigation on electrothermal instabilities in early phases of cylindrical foil implosions on primary test stand facility

1 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
2 Institute of Fluid Physics, Chinese Academy of Engineering Physics, Mianyang 621900, China

收稿日期:2018-08-29 修回日期:2018-11-23 出版日期:2019-02-05 发布日期:2019-02-05
通讯作者: Yang Zhang E-mail:zhang_yang@iapcm.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11805019, 11775032, 11605013, and 11705013).

Preliminary investigation on electrothermal instabilities in early phases of cylindrical foil implosions on primary test stand facility

Guanqiong Wang(王冠琼)¹, Delong Xiao(肖德龙)¹, Jiakun Dan(但家坤)², Yang Zhang(张扬)¹, Ning Ding(丁宁)¹, Xianbin Huang(黄显宾)², Xiaoguang Wang(王小光)¹, Shunkai Sun(孙顺凯)¹, Chuang Xue(薛创)¹, Xiaojian Shu(束小建)¹

1 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
2 Institute of Fluid Physics, Chinese Academy of Engineering Physics, Mianyang 621900, China

Received:2018-08-29 Revised:2018-11-23 Online:2019-02-05 Published:2019-02-05
Contact: Yang Zhang E-mail:zhang_yang@iapcm.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11805019, 11775032, 11605013, and 11705013).

摘要/Abstract

摘要：

Recent experiments on the implosions of 15-mm long and 2-μm thick aluminum liners having a diameter of 12.8 mm have been performed on the primary test stand (PTS) facility. The stratified structures are observed as alternating dark and light transverse stripes in the laser shadowgraph images. These striations perpendicular to the current flow are formed early in the implosion, i.e., at the stage when the bulk of the material mass was almost at rest. A two-dimensional (2D) magnetohydrodynamics (MHD) code is employed to simulate the behavior of liner dynamics in the early phases. It is found that the striations may be produced by the electrothermal instability (ETI) that results from non-uniform Joule heating due to the characteristic relation between the resistivity and the temperature. In 2D simulations, the stratified structures can be seen obviously in both density and temperature contours as the liner expands rapidly. By analyzing instability spectrum, the dominant wavelengths of the perturbations are 8.33 μm-20.0 μm, which agree qualitatively with the theoretical predictions. It is also interesting to show that ETI provides a significant seed to the subsequent magneto Rayleigh-Taylor (MRT) instability.

关键词: Z-pinch, electrothermal instability, magnetohydrodynamics (MHD) simulations

Abstract:

Key words: Z-pinch, electrothermal instability, magnetohydrodynamics (MHD) simulations

中图分类号: (Z-pinches, plasma focus, and other pinch devices)

52.58.Lq

52.30.Cv (Magnetohydrodynamics (including electron magnetohydrodynamics)) 52.65.-y (Plasma simulation)

王冠琼, 肖德龙, 但家坤, 张扬, 丁宁, 黄显宾, 王小光, 孙顺凯, 薛创, 束小建. Preliminary investigation on electrothermal instabilities in early phases of cylindrical foil implosions on primary test stand facility[J]. 中国物理B, 2019, 28(2): 25203-025203.

Guanqiong Wang(王冠琼), Delong Xiao(肖德龙), Jiakun Dan(但家坤), Yang Zhang(张扬), Ning Ding(丁宁), Xianbin Huang(黄显宾), Xiaoguang Wang(王小光), Shunkai Sun(孙顺凯), Chuang Xue(薛创), Xiaojian Shu(束小建). Preliminary investigation on electrothermal instabilities in early phases of cylindrical foil implosions on primary test stand facility[J]. Chin. Phys. B, 2019, 28(2): 25203-025203.

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Preliminary investigation on electrothermal instabilities in early phases of cylindrical foil implosions on primary test stand facility

Preliminary investigation on electrothermal instabilities in early phases of cylindrical foil implosions on primary test stand facility

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