Title :
Development of a 170GHz high-power and CW gyrotron for fusion application
Author :
Kasugai, Atsushi ; Minami, Ryutaro ; Takahashi, Koji ; Kobayashi, Noriyuki ; Sakamoto, Keishi
Author_Institution :
Japan Atomic Energy Res. Inst., Ibaraki, Japan
Abstract :
Development of 170 GHz-long pulse gyrotrons for ITER is underway in JAERI. A cooling system was enhanced for CW gyrotron operation and a pre-programming control of a cathode heater power was introduced. As a preliminary result, stable quasi-steady-state oscillations of 450s /0.2 MW and 600s /0.13MW were obtained. An oscillation test tube with higher order mode TE31,12 in cylindrical cavity and a high efficiency built-in mode converter has been developed for an advanced gyrotron system. In an initial experiment, performances of 1 MW /short pulse, the efficiency of 28% without depressed collector were obtained and measured output RF profile was in good agreement with the design.
Keywords :
cathodes; cooling; electromagnetic oscillations; gyrotrons; melting; microwave frequency convertors; 0.13 MW; 0.2 MW; 170 GHz; cathode heater power; cooling system; cylindrical cavity; fusion application; high efficiency built-in mode converter; high-power CW gyrotron; oscillation test tube; Cathodes; Control systems; Cooling; Gyrotrons; Performance evaluation; Pulse measurements; Radio frequency; System testing; Tellurium; Temperature control;
Conference_Titel :
Infrared and Millimeter Waves and 13th International Conference on Terahertz Electronics, 2005. IRMMW-THz 2005. The Joint 30th International Conference on
Print_ISBN :
0-7803-9348-1
DOI :
10.1109/ICIMW.2005.1572521
