The impact of plasma dynamics on the self-magnetic-pinch diode impedance

被引：11

作者：

Bennett, Nichelle ^{[1
]}

Welch, Dale R. ^{[2
]}

Webb, Timothy J. ^{[3
]}

Mazarakis, Michael G. ^{[3
]}

Kiefer, Mark L. ^{[3
]}

Crain, M. Dale ^{[1
]}

Droemer, Darryl W. ^{[1
]}

Gignac, Raymond E. ^{[1
]}

Johnston, Mark D. ^{[3
]}

Leckbee, Joshua J. ^{[3
]}

Molina, Isidro ^{[1
]}

Nielsen, Dan ^{[3
]}

Obregon, Robert ^{[1
]}

Romero, Tobias ^{[3
]}

Simpson, Sean ^{[3
]}

Smith, Chase C. ^{[1
]}

Wilkins, Frank L. ^{[1
]}

Ziska, Derek ^{[3
]}

机构：

[1] Natl Secur Technol LLC, Las Vegas, NV 89193 USA

[2] Voss Sci LLC, Albuquerque, NM 87108 USA

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

来源：

PHYSICS OF PLASMAS | 2015年 / 22卷 / 03期

关键词：

PARTICLE-IN-CELL; ELECTRON; DESORPTION; EMISSION; TARGET; SPOT; FLOW;

D O I：

10.1063/1.4916062

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：

The self-magnetic-pinch diode is being developed as an intense electron beam source for pulsed-power-driven x-ray radiography. The basic operation of this diode has long been understood in the context of pinched diodes, including the dynamic effect that the diode impedance decreases during the pulse due to electrode plasma formation and expansion. Experiments being conducted at Sandia National Laboratories' RITS-6 accelerator are helping to characterize these plasmas using time-resolved and time-integrated camera systems in the x-ray and visible. These diagnostics are analyzed in conjunction with particle-in-cell simulations of anode plasma formation and evolution. The results confirm the long-standing theory of critical-current operation with the addition of a time-dependent anode-cathode gap length. The results may suggest that anomalous impedance collapse is driven by increased plasma radial drift, leading to larger-than-average ion nu(r) x B-theta acceleration into the gap. (C) 2015 AIP Publishing LLC.

引用

页数：10

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