Measurement of anode surface temperature during a high-current vacuum arc

Raymond L. Boxman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Anode surface temperature was measured during a 3.8-kA-peak-current 7.2-ms-duration discharge between 2.5-cm-diam Ni electrodes spaced 9 mm apart. The temperature was determined by measurements of the spectral radiance of the anode in the 0.6-1.0-μm spectral region by means of a Si photovoltaic detector and narrow-band interference filters. The spectral radiance was related to anode surface temperature through the Planck radiation law. The major uncertainty in the measurement was the uncertainty of the emissivity. The actual temperature could be bracketed, however, by assuming alternatively the lowest published emissivity and unity emissivity. Prior to high-voltage arcing onset at 2.7 kA, the anode surface temperature was below 1500 °K. After high-voltage arcing onset the surface temperature rose very rapidly, reaching an equilibrium temperature of approximately 2900 °K.

Original languageEnglish
Pages (from-to)4701-4704
Number of pages4
JournalJournal of Applied Physics
Volume46
Issue number11
DOIs
StatePublished - 1975
Externally publishedYes

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