Observation of vacuum arc cathode spot with high-speed framing camera

Maxim B. Bochkarev; Vitaly B. Lebedev; Gregory G. Feldman

doi:10.1117/12.725236

11 January 2007 Observation of vacuum arc cathode spot with high-speed framing camera

Maxim B. Bochkarev, Vitaly B. Lebedev, Gregory G. Feldman

Proceedings Volume 6279, 27th International Congress on High-Speed Photography and Photonics; 62792E (2007) https://doi.org/10.1117/12.725236
Event: 27th International congress on High-Speed Photography and Photonics, 2006, Xi'an, China

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.

Citation Download Citation

Maxim B. Bochkarev, Vitaly B. Lebedev, and Gregory G. Feldman "Observation of vacuum arc cathode spot with high-speed framing camera", Proc. SPIE 6279, 27th International Congress on High-Speed Photography and Photonics, 62792E (11 January 2007); https://doi.org/10.1117/12.725236

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