RF windows of low reflectivity and absorption for high average power gyroklystrons

The major subjects of RF window design for high aver-age power gyroklystron are to reduce there reflectivity and absorption power in order to enhance its stability and protect output window. In this paper, the window’s reflection and absorption are analyzed in detail. As an example, a sapphire window of 9mm in diameter and 1.459 mm in thickness for 34GHz, TE
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gyroklystron is presented. Its reflectivity is less than 1% if process error is within 2%, and its absorbing power is about 5W while the output average power is 20kW.