Vacuum-breakdown properties of oxygen-free copper electrodes machined by diamond turning for mirror finish

Shinichi Kobayashi; Yasuyuki Hashimoto; Yoshio Saito; Yasuchika Nagai; Yoshiki Yamamoto; Kiyomatsu Takeuchi; Takeshi Sugano

doi:10.1117/12.174665

1 May 1994 Vacuum-breakdown properties of oxygen-free copper electrodes machined by diamond turning for mirror finish

Shinichi Kobayashi, Yasuyuki Hashimoto, Yoshio Saito, Yasuchika Nagai, Yoshiki Yamamoto, Kiyomatsu Takeuchi, Takeshi Sugano

Author Affiliations +

Proceedings Volume 2259, XVI International Symposium on Discharges and Electrical Insulation in Vacuum; (1994) https://doi.org/10.1117/12.174665
Event: XVI International Symposium on Discharges and Electrical Insulation in Vacuum, 1994, Moscow-St. Petersburg, Russian Federation

Abstract

The electrodes used in this investigation to experimentally evaluate the effect of diamond turning on electrical breakdown characteristics in vacuum were first roughly machined by turning, and then machined to a mirror finish by diamond turning. Residual stresses of the electrode surfaces were measured by an X-ray diffraction method before and after the diamond turning. Several electrodes were annealed in vacuum for one hour at 400 degree(s)C or 700 degree(s)C before the diamond turning. Vacuum breakdown experiments using impulse voltages with the wave form of 64/700 microsecond(s) revealed that the diamond turning improves breakdown strength, that the conditioning of vacuum gaps is achieved by only few tens of breakdowns, and that annealed electrodes have a better hold-off voltage capability.

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Shinichi Kobayashi, Yasuyuki Hashimoto, Yoshio Saito, Yasuchika Nagai, Yoshiki Yamamoto, Kiyomatsu Takeuchi, and Takeshi Sugano "Vacuum-breakdown properties of oxygen-free copper electrodes machined by diamond turning for mirror finish", Proc. SPIE 2259, XVI International Symposium on Discharges and Electrical Insulation in Vacuum, (1 May 1994); https://doi.org/10.1117/12.174665

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