Multi-Frequency Gyrotron with BN Brewster Window

A multi-frequency gyrotron equipped with a circular Brewster window made on the base of high-temperature-brazed ceramic disc was tested. Efficient gyrotron operation at 11 modes (frequencies) in the range of 105 GHz -143 GHz was demonstrated. Gyrotron output power (0.8 MW/0.1 sec) was limited by the used power supply. The gyrotron scheme and the test results are used in the design of long-pulse gyrotron with a CVD diamond window.