Characterisation of the current switch mechanism in two-stage wire array Z-pinches

被引：8

作者：

Burdiak, G. C. ^{[1
]}

Lebedev, S. V. ^{[1
]}

Harvey-Thompson, A. J. ^{[1
]}

Hall, G. N. ^{[1
]}

Swadling, G. F. ^{[1
]}

Suzuki-Vidal, F. ^{[1
]}

Khoory, E. ^{[1
]}

Bland, S. N. ^{[1
]}

Pickworth, L. ^{[1
]}

de Grouchy, P. ^{[1
]}

Skidmore, J. ^{[1
]}

Suttle, L. ^{[1
]}

Waisman, E. M. ^{[2
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2BW, England

[2] Sandia Natl Labs, Albuquerque, NM 87185 USA

来源：

PHYSICS OF PLASMAS | 2015年 / 22卷 / 11期

基金：

英国工程与自然科学研究理事会;

关键词：

EROSION OPENING SWITCH; PLASMA-FLOW SWITCH; IMPLOSION; DYNAMICS;

D O I：

10.1063/1.4936278

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：

In this paper, we describe the operation of a two-stage wire array z-pinch driven by the 1.4 MA, 240 ns rise-time Magpie pulsed-power device at Imperial College London. In this setup, an inverse wire array acts as a fast current switch, delivering a current pre-pulse into a cylindrical load wire array, before rapidly switching the majority of the generator current into the load after a 100-150 ns dwell time. A detailed analysis of the evolution of the load array during the pre-pulse is presented. Measurements of the load resistivity and energy deposition suggest significant bulk heating of the array mass occurs. The similar to 5 kA pre-pulse delivers similar to 0.8 J of energy to the load, leaving it in a mixed, predominantly liquid-vapour state. The main current switch occurs as the inverse array begins to explode and plasma expands into the load region. Electrical and imaging diagnostics indicate that the main current switch may evolve in part as a plasma flow switch, driven by the expansion of a magnetic cavity and plasma bubble along the length of the load array. Analysis of implosion trajectories suggests that approximately 1 MA switches into the load in 100 ns, corresponding to a doubling of the generator dI/dt. Potential scaling of the device to higher current machines is discussed. (C) 2015 AIP Publishing LLC.

引用

页数：14

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