High-power microwave vacuum window of fused quartz in circular waveguide.

A demountable vacuum window of fused quartz was designed and successfully used for a highpower circular waveguide system combined with 28-GHz gyrotrons for electron cyclotron resonance heating experiments in the GAMMA 10 tandem mirror. The power reflection coefficient is very low (≤0.1%) and it works satisfactorily at the transmitted power level of 120 kW with 60-ms pulse width. No problems are expected up to 200-kW transmission with 0.1-s duration. [ABSTRACT FROM AUTHOR]