ECW/EBW heating and current drive experiment results and prospects for CW operation in QUEST

Hiroshi Idei, Hideki Zushi, Kazuaki Hanada, Evgeniya Kalinnikova, Kazuo Nakamura, Akihide Fujisawa, Yoshihiko Nagashima, Makoto Hasegawa, Keisuke Matsuoka, Tsuyoshi Kariya, Tsuyoshi Imai, Ryutaro Minami, Naoaki Yoshida, Mizuki Sakamoto, Hideo Watanabe, Kazutoshi Tokunaga, Akira Ejiri, Masatsugu Sakaguchi, Masaki Ishiguro, Saya TashimaAtsushi Fukuyama, Hiroe Igami, Shin Kubo, Mitsutaka Isobe, Kenichi Nagaoka, Hideya Nakanishi, Nobuhiro Nishino, Shoji Kawasaki, Hisatoshi Nakashima, Aki Higashijima, Yuichi Takase, Takashi Maekawa, Osamu Mitarai, Mitsuru Kikuchi, Kazuo Toi

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10 Citations (Scopus)

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.

Original languageEnglish
Article number2402112
JournalPlasma and Fusion Research
Volume7
Issue numberSPL.ISS.1
DOIs
Publication statusPublished - 2012

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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