Dynamics of a high-power aluminum-wire array Z-pinch implosion

被引:54
作者
Sanford, TWL
Nash, TJ
Mock, RC
Spielman, RB
Struve, KW
Hammer, JH
DeGroot, JS
Whitney, KG
Apruzese, JP
机构
[1] LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA
[2] USN, RES LAB, RADIAT HYDRODYNAM BRANCH, WASHINGTON, DC 20375 USA
关键词
D O I
10.1063/1.872382
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Annular Al-wire Z-pinch implosions on the Saturn accelerator [D.D. Bloomquist et al., Proceedings, 6th Pulsed Power Conference (Institute of Electrical and Electronics Engineers, New York, 1987), p. 310] that have high azimuthal symmetry exhibit both a strong first and weaker second x-ray burst that correlate with strong and weaker radial compressions, respectively. Measurements suggest that the observed magnetic Rayleigh-Taylor (RT) instability prior to the first compression seeds an m=0 instability observed later. Analyses of axially averaged spectral data imply that, during the first compression, the plasma is composed of a hot core surrounded by a cooler plasma halo. Two-dimensional (2-D) radiation magnetohydrodynamic computer simulations show that a RT instability grows to the classic bubble and spike structure during the course of the implosion. The main radiation pulse begins when the bubble reaches the axis and ends when the spike finishes stagnating on axis and the first compression ends. These simulations agree qualitatively with the measured characteristics of the first x-ray pulse and the overall energetics, and they provide a 2-D view into the plasma hydrodynamics of the implosion.
引用
收藏
页码:2188 / 2203
页数:16
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