1. ECW/EBW heating and current drive experiment results and prospects for CW operation in QUEST
- Author
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Hiroshi Idei, Mitsuru Kikuchi, Hisatoshi Nakashima, Kazuo Toi, Mizuki Sakamoto, Akira Ejiri, Atsushi Fukuyama, Kazutoshi Tokunaga, Mitsutaka Isobe, S. Tashima, Akihide Fujisawa, Hideya Nakanishi, Osamu Mitarai, Nobuhiro Nishino, Shoji Kawasaki, Hideki Zushi, Tsuyoshi Kariya, Kazuo Nakamura, E. I. Kalinnikova, Tsuyoshi Imai, Hideo Watanabe, Hiroe Igami, Yuichi Takase, Shin Kubo, Kenichi Nagaoka, Takashi Maekawa, Makoto Hasegawa, Kazuaki Hanada, Keisuke Matsuoka, M. Ishiguro, Naoaki Yoshida, Yoshihiko Nagashima, M. Sakaguchi, Ryutaro Minami, and Aki Higashijima
- Subjects
Nuclear physics ,Physics ,Nuclear magnetic resonance ,Condensed Matter Physics - Abstract
A CW phased-array antenna system for electron cyclotron/Bernstein wave heating and current drive (ECWH/CD, EBWH/CD) experiments was developed in the QUEST. The antenna was designed to excite an elliptically polarized pure O-mode wave in oblique injection for the O-X-B mode conversion scenario, and its good performance was confirmed at a high power level. Long pulse discharges with a plasma current of 10 kA and 15 kA were non-inductively attained for 37 s and 20 s, respectively, with only radio frequency (RF) power. Divertor configurationswere also obtained in the RF-sustained plasmas. A new operational window for sustained plasma current was observed in the high-density plasma with a higher RF incident power. Two new heating and current drive systems with an 8.56GHz klystron and a 28GHz gyrotron are being prepared to conduct CW EBWH/CD experiments in the high-density plasma. © 2012 The Japan Society of Plasma Science and Nuclear Fusion Research.
- Published
- 2016