Status of high power gyrotron development in JAEA

Recent results of a multi-frequency gyrotron and a high frequency power modulation experiment using 170 GHz gyrotron are reported. Three frequency oscillations and their Gaussian beam outputs are demonstrated at 170 GHz, 137 GHz and 104 GHz. At present, 0.9 MW/ 70 sec, 1.1 MW/ 5 sec were obtained at 170 GHz. An experiment of 203 GHz oscillation will be conducted from April 2013 in addition to further power increase and pulse extension. In parallel, 5 kHz full power modulation was demonstrated by an anode voltage modulation using a double anode switching.