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For future high-frequency (<100 GHz) high-power (≥ 0.5 MW) cw gyrotrons a cryogenically cooled window (CRW) seems to be a suitable vaccuum barrier pervious for the RF power.
H.-U. Nickel
"Investigation on cryogenically cooled windows for MW/cw gyrotrons", Proc. SPIE 1514, 15th International Conference on Infrared and Millimeter Waves, 15144U (1 December 1990); https://doi.org/10.1117/12.2301584
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H.-U. Nickel, "Investigation on cryogenically cooled windows for MW/cw gyrotrons," Proc. SPIE 1514, 15th International Conference on Infrared and Millimeter Waves, 15144U (1 December 1990); https://doi.org/10.1117/12.2301584