Observations of a vacuum spark under different driver conditions of the applied voltage
作者:
H. Chuaqui,
M. Favre,
L. Soto,
E. Wyndham,
期刊:
Physics of Fluids B: Plasma Physics
(AIP Available online 1993)
卷期:
Volume 5,
issue 11
页码: 4244-4249
ISSN:0899-8221
年代: 1993
DOI:10.1063/1.860590
出版商: AIP
数据来源: AIP
摘要:
Comparative observations of the Vacuum Spark discharge are presented under differing electrical drive conditions but identical geometrical conditions. A 1.5 &OHgr; 120 nsec, coaxial line is used to provide maximum currents to 90 kA. The line may be operated in the usual switched mode to give a rectangular voltage and current wave form, or in the Hybrid mode, in which case the voltage builds slowly until breakdown occurs. In both modes of operation the value ofdI/dtis about 1×1012A/sec. A Nd:YAG is focused onto either electrode to initiate the discharge. With the laser focused onto the anode a low‐density plasma accompanied by intense electron beams is formed. With the laser focused on the cathode a much higher plasma density is observed in the gap, with the formation of a dense tight pinch close to the cathode, in which hot spots form at peak current. The Hybrid mode is favored for its reproducible behavior.
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