Improved large diameter wire array implosions from increased wire array symmetry and on-axis mass participation

被引:36
作者
Deeney, C
Nash, TJ
Spielman, RB
Seaman, JF
McGurn, JS
Jobe, DO
Vargas, MF
Gilliland, TL
Mock, RC
Struve, KW
Whitney, KG
Pulsifer, PE
Apruzese, JP
Thornhill, JW
Davis, J
机构
[1] Sandia Natl Labs, Albuquerque, NM 87185 USA
[2] USN, Res Lab, Washington, DC 20375 USA
关键词
D O I
10.1063/1.872919
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
Aluminum wire array, Z-pinch experiments have been performed on an 8 MA generator using arrays consisting of 24, 30, and 42 wires. These experiments were designed to scan through a region of (array mass, implosion velocity) space in which greater than 30% conversion of the implosion kinetic energy into K-shell x rays was predicted to occur [Thornhill et al., Phys. Plasmas 1, 321 (1994)]. Array masses between 120 and 2050 mu g/cm were used in these experiments. An analysis of the x-ray data taken using 24 wire arrays, shows a one-to-one correspondence between the observed kilo-electron-volt yields (5-64 kJ) and the fraction of initial array mass (0.3%-60%) that is radiating from the K shell. The 30 and 42 wire experiments demonstrated that tighter pinches with increased radiated powers were achieved with these larger wire number, improved symmetry arrays. In addition, increases in the implosion mass and array diameter in the 30 and 42 wire number cases resulted in increases in the radiated yield over the corresponding 24 wire shots, up to 88 kJ, which can be interpreted as due to improved coupling and thermalization of the kinetic energy. Moreover, spectroscopic analyses of the 30 and 42 wire experiments have shown that the increased wire numbers also resulted in K-shell radiating mass fractions of greater than 50%. (C) 1998 American Institute of Physics. [S1070-664X(98)03606-4]
引用
收藏
页码:2431 / 2441
页数:11
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