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Proceedings Paper

Observation of vacuum arc cathode spot with high-speed framing camera
Author(s): Maxim B. Bochkarev; Vitaly B. Lebedev; Gregory G. Feldman
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Paper Abstract

A copper vacuum arc cathode spot at current 10-100 A was imaged by three-frame camera K 0011 (BIFO Company, Russia) with frame exposures 30 ns and 6 ns and spatial resolution up to 7 μm. It was found that spot splitting into separate fragments occurs at currents higher than 50 A. The average fragment size was found to be 20 μm at current about 10 A (cathode spot consists of a single fragment). With the rise of the arc current the average fragment size rises too and reaches 50 μm at current 100 A (cathode spot consists of two or three fragments). The overall dimension of region occupied by cathode spot fragments rises from 20 μm at current 12 A to 120 μm at current 100 A. Observations with high temporal resolution (exposure time 6 ns) reveal the significant changes of cathode spot brightness occurring within about 10 ns time interval.

Paper Details

Date Published: 11 January 2007
PDF: 6 pages
Proc. SPIE 6279, 27th International Congress on High-Speed Photography and Photonics, 62792E (11 January 2007);
Show Author Affiliations
Maxim B. Bochkarev, Institute of Electrophysics (Russia)
Vitaly B. Lebedev, BIFO Co. (Russia)
Gregory G. Feldman, BIFO Co. (Russia)

Published in SPIE Proceedings Vol. 6279:
27th International Congress on High-Speed Photography and Photonics
Xun Hou; Wei Zhao; Baoli Yao, Editor(s)

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