Title :
Progress of high power gyrotron development in JAEA
Author :
Sakamoto, Keishi ; Kasugai, Atsushi ; Kajiwara, Ken ; Oda, Yasuhisa ; Takahashi, Koji ; Hayashi, Kazuo ; Ikeda, Yukiharu ; Okazaki, Yukio ; Kobayashi, Noriyuki
Author_Institution :
Japan Atomic Energy Agency, Ibaraki, Japan
Abstract :
Recent progress on a high power 170 GHz gyrotron development in JAEA is presented. After the demonstration of ITER basic performance, the gyrotron has been operated for 3 years, and recorded ~200 GJ of total output energy. As a next activity, a study of a CW-power modulation of the gyrotron for NTM (Neo classical Tearing Mode) stabilization has started. Up to now, power modulation of 5 kHz for short pulse, and 0.3 kHz for 5 min were demonstrated at ~0.8 MW. The efficiency of 50% was kept at each pulse. On the other hand, a gyrotron capable to operate at two frequencies has been designed and fabricated. A first oscillation of 1 MW at dual frequencies of 170 GHz and 137 GHz was demonstrated.
Keywords :
gyrotrons; millimetre wave tubes; modulational instability; plasma radiofrequency heating; CW-power modulation; ITER gyrotron; JAEA; energy 200 GJ; frequency 137 GHz; frequency 170 GHz; high power gyrotron development; neo classical tearing mode stabilization; power 0.8 MW; power 1 MW; power modulation; time 3 year; time 5 min; Anodes; Frequency; Gyrotrons; Heating; Power generation; Power supplies; Pulse modulation; Switches; Temperature control; Voltage;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves, 2009. IRMMW-THz 2009. 34th International Conference on
Conference_Location :
Busan
Print_ISBN :
978-1-4244-5416-7
Electronic_ISBN :
978-1-4244-5417-4
DOI :
10.1109/ICIMW.2009.5324772
