Dynamics of the pulsed high-current vacuum arc in semiuniform electrode geometry

Arturo Robledo-Martinez, Fermin P. Espino-Cortes

Research output: Contribution to journalArticle

Abstract

A vacuum spark develops in the metallic vapor emitted by the electrodes. The plasma thus created experiences contractions and expansions and emits X-rays. We report here an investigation into the initial dynamics of the arc. A fast 1-kJ generator was used for the experiments. The diagnostics employed include optical frame and streak photography, time-resolved filtered X-ray detection, and pinhole X-ray photography. The results obtained indicate that there is plasma column pinching, some of it producing X-radiation. The energy of the X-rays tends to be rather soft and seldom were characteristics lines detected, even when exchanging electrodes, which are made of dissimilar material. This demonstrates that radiative collapse is not attained at this level of energy and that from the point of view of X-ray emission, it is irrelevant what metallic vapors initiate the vacuum arc.
Original languageAmerican English
Pages (from-to)1893-1896
Number of pages1703
JournalIEEE Transactions on Plasma Science
DOIs
StatePublished - 1 Oct 2002

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Vacuum
high current
Electrodes
arcs
X-Rays
vacuum
electrodes
geometry
x rays
Photography
frame photography
streak photography
vapors
exchanging
photography
pinholes
sparks
contraction
generators
expansion

Cite this

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abstract = "A vacuum spark develops in the metallic vapor emitted by the electrodes. The plasma thus created experiences contractions and expansions and emits X-rays. We report here an investigation into the initial dynamics of the arc. A fast 1-kJ generator was used for the experiments. The diagnostics employed include optical frame and streak photography, time-resolved filtered X-ray detection, and pinhole X-ray photography. The results obtained indicate that there is plasma column pinching, some of it producing X-radiation. The energy of the X-rays tends to be rather soft and seldom were characteristics lines detected, even when exchanging electrodes, which are made of dissimilar material. This demonstrates that radiative collapse is not attained at this level of energy and that from the point of view of X-ray emission, it is irrelevant what metallic vapors initiate the vacuum arc.",
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Dynamics of the pulsed high-current vacuum arc in semiuniform electrode geometry. / Robledo-Martinez, Arturo; Espino-Cortes, Fermin P.

In: IEEE Transactions on Plasma Science, 01.10.2002, p. 1893-1896.

Research output: Contribution to journalArticle

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