The teeth of the rotary capacitor for the University of Rochester frequency modulated cyclotron are to be made of copper plated ceramic material. Tests were conducted on the high frequency breakdown in a vacuum between copper plated zircon surfaces. For comparison, solid copper electrodes were also test¬ed. The gap electrodes were flat plates approximately 3/4" by 1-1/4" with 1/16" radius corners.nData were obtained for both outgassed and fresh surfaces. It was found that the copper plated ceramic gave about the same results as solid copper. The sputtering of the copper plating is apparently not too serious. The design the University of Rochester rotary capacitor is based on these tests and experience with the 184" rotary capacitor.
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