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Kobayashi, Takayuki; Isayama, Akihiko; Sawahata, Masayuki; Terakado, Masayuki; Shimono, Mitsugu; Igarashi, Koichi; Hinata, Jun; Kajiwara, Ken; Kasugai, Atsushi; Sakamoto, Keishi; et al.
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High power gyrotron operation at an output power of 1.5 MW was carried out using the JT-60 gyrotron. Pulse length had been limited to 100 ms at an output power of well exceeding 1 MW. An oscillation at 1.5 MW with a pulse length of 1 s was demonstrated, for the first time, in 2007 by the JT-60 gyrotron. We evaluated the heat load on each component of the gyrotron and it was shown that the gyrotron could be operated at 1.5 MW with the pulse length of up to 3 s from the view point of the heat load. In 2009, we tried the operation at the output power of 1.5 MW aiming at the demonstration of the pulse length of 3 s or longer. An operation technique, by which an anode voltage was changed only at the beginning of the pulse, was developed and it resulted in obtaining relatively higher oscillation efficiency. The oscillation at 1.5 MW for 4 s was demonstrated for the first time.
Isayama, Akihiko; Kobayashi, Takayuki; Moriyama, Shinichi; Sawahata, Masayuki; Suzuki, Sadaaki; Yokokura, Kenji; Shimono, Mitsugu; Hasegawa, Koichi; Terakado, Masayuki; Hiranai, Shinichi; et al.
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no abstracts in English
Oda, Yasuhisa; Kajiwara, Ken; Takahashi, Koji; Kasugai, Atsushi; Sakamoto, Keishi
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Kasugai, Atsushi; Kajiwara, Ken; Oda, Yasuhisa; Takahashi, Koji; Hayashi, Kazuo; Okazaki, Yukio*; Sakamoto, Keishi
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Next target in the JAEA is development of advanced gyrotron for ITER such as high power repetitive operation, high frequency power modulation and dual frequencies. In repetitive operation, 400 s pulse operation was 10 times with pulse interval of 30 min was demonstrated. In high frequency power modulation, 300Hz-5min full modulation and 5kHz-10s RF modulation were demonstrated. In parallel, higher order mode gyrotron with TE31,11 have been manufactured and high power test was just started. In preliminary result, dual frequencies of 170 GHz with TE31,11 and 137 GHz with TE 25, 9 and high power output more than 1 MW were obtained in the short pulse operation.