What is the material used for RF window in Gyrotron other than Beryllia?

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N M Ryskin

The best (but most expensive) are CVD diamond windows, owing to highest thermal conductivity. Please see e.g. the recent comprehensive review article devoted to the Gyrotron's 50th anniversary.

Article The Gyrotron at 50: Historical Overview

B.R. Poole

Sapphire windows are commonly used for gyrotrons.

Dr. M. Thottappan

Diamond material could be used to design an RF window for high power (both kW and MW) gyrotrons.

Alumina, beryllia, which has a very high thermal conductivity, sapphire, which is extremely low-loss and has high strength, or CVD diamond.