Development of a multiple-frequency gyrotron, gyrotron FU CW GV

Gyrotron FU CW GV has been developed as a multiple-frequency gyrotron. The main mode is TE10, 6 and corresponding frequency is 265 GHz. More than ten modes oscillated and Gaussian beams were radiated for these modes. A double-disk window was adopted to maintain the transmittance through the window in high level for a wide range of frequency.