Title :
Development of high power gyrotron for ITER application
Author :
Sakamoto, K. ; Kajiwara, K. ; Takahashi, K. ; Oda, Y. ; Kasugai, A. ; Kobayashi, T. ; Kobayashi, N. ; Henderson, M. ; Darbos, C.
Author_Institution :
Japan Atomic Energy Agency, Naka, Japan
Abstract :
Recent progress on the development of a high power 170 GHz gyrotron obtained in Japan Atomic Energy Agency (JAEA) is presented. Firstly, the repetitive operation of 800 kW/600 s with an interval of 20-30 min was performed. The electrical efficiency was 52-57% with the depressed collector. The 72 shots of 88 shots was very stable 600 s oscillation. No damage was found on the gyrotron by this test. Secondly, 5 kHz-full power modulation was demonstrated at CW mode. For this purpose, a full beam current modulation was realized by switching the anode voltage to minimized the collector heat load. Thirdly, in the dual frequency gyrotron development, the 1.3 MW oscillations at 170 GHz and 136.8 GHz were successfully demonstrated by changing the cavity field and the anode voltage keeping other parameters constant.
Keywords :
Tokamak devices; gyrotrons; plasma radiofrequency heating; ITER application; dual frequency gyrotron development; efficiency 52 percent to 57 percent; frequency 136.8 GHz; frequency 170 GHz; full beam current modulation; high power gyrotron; power 1.3 MW; power 800 kW; time 20 min to 30 min; time 600 s; Anodes; Frequency modulation; Gyrotrons; Oscillators; Power supplies; Switches;
Conference_Titel :
Infrared Millimeter and Terahertz Waves (IRMMW-THz), 2010 35th International Conference on
Conference_Location :
Rome
Print_ISBN :
978-1-4244-6655-9
DOI :
10.1109/ICIMW.2010.5613016
