CHARACTERISTICS OF A Z-PINCH PRODUCED FROM A GLASS OPTICAL FIBER

被引:19
作者
FIGURA, ES
MCCALL, GH
DANGOR, AE
机构
[1] UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545
[2] IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND
来源
PHYSICS OF FLUIDS B-PLASMA PHYSICS | 1991年 / 3卷 / 10期
关键词
D O I
10.1063/1.859917
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
A Z-pinch discharge in a quartz fiber (20-125-mu-m diameter) driven by a 150 kA current with a rise time of 50 nsec has been investigated. The pinch was found to develop an m = 0 instability during the time of current rise and before the whole fiber had been formed into a plasma. No anomalously stable behavior was seen. The bright spots associated with the instability expanded radially and moved in the axial direction with typical velocities of a few 10(6) cm sec-1. A coronal plasma was found to exist with density 10(16) cm-3 at a radius 500-mu-m. There was evidence of an energetic (20 keV) electron beam. The observed plasma expansion and ionization agreed well with a one-dimensional magnetohydrodynamic simulation. The simulation showed that the light which was observed to be generated in the core of the optical fiber was due to shock heating. The predicted temperature of the surface of the plasma was also in good agreement with an estimate of the temperature (25 +/- 8 eV) obtained by assuming that the light emission was blackbody.
引用
收藏
页码:2835 / 2843
页数:9
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