Abstract

The damage that occurs at alumina windows of high-power millimeter wave gyrotrons operating in TE[sub 0,n] mode is investigated. This damage appears only on the air side of the window where it yields small spot-like features (diameter 1 cm). The damage observed is thought to be related to rf field enhancements by resonances of trapped electromagnetic modes and by protrusions and contaminations of the ceramic surface. 16 refs., 7 figs., 3 tabs.

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