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22-27 October 2018
Mahatma Mandir Conference Centre
Asia/Kolkata timezone
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Fully Non-inductive 2nd Harmonic Electron Cyclotron Current Ramp-up with Focused Polarized Beams in the QUEST Spherical Tokamak

24 Oct 2018, 08:30
4h
Mahatma Mandir Conference Centre

Mahatma Mandir Conference Centre

Gandhinagar (nearest Airport: Ahmedabad), India
Poster P3 Posters

Speaker

Dr Hiroshi Idei (Research Institute for Applied Mechanics, Kyushu University)

Description

A transmission line and a launcher system have been newly developed to conduct the second (2nd) harmonic electron cyclotron (EC) plasma ramp-up with an eXtra-ordinary mode wave in the QUEST spherical tokamak. The incident elliptical polarizations were controlled with two corrugated (quarter/one-eighth wavelength) polarizers. The launcher system with two quasi-optical mirrors produced a sharply focused incident beam with a waist size of 0.05 m at the 2nd electron cyclotron resonance layer. The obtained electron density was one order of magnitude higher, compared to the previous experiments with no polarized focusing-beam. As a new record of non-inductive plasma ramp-up with EC-waves, a highest plasma current of 86 kA was achieved with a focused 230 kW 28GHz-beam. The record plasma current ramp-up efficiency on the incident power in the 2nd harmonic EC scenario was also achieved.
Paper Number EX/P3-21
Country or International Organization Japan

Primary author

Dr Hiroshi Idei (Research Institute for Applied Mechanics, Kyushu University)

Co-authors

Ms Aki Higashijima (Research Institute for Applied Mechanics, Kyushu University) Dr Akira Ejiri (Graduate School of Frontier Sciences, The University of Tokyo) Prof. Atsushi Fukuyama (Kyoto University) Dr Gary Taylor (Princeton Plasma Physics Laboratory) Prof. Kazuaki Hanada (Advanced Fusion Research Center, Research Institute for Applied Mechanics, Kyushu University) Dr Kazuo Nakamura (Research Institute for Applied Mechanics, Kyushu University) Mr Kazuya Nagata (Research Institute for Applied Mechanics, Kyushu University) Dr Kengoh Kuroda (Research Institute for Applied Mechanics, Kyushu University) Dr Kishore Mishra (Institute for Plasma Research) Dr Makoto Hasegawa (Research Institute for Applied Mechanics, Kyushu University) Mr Masaharu Fukuyama (Interdisciplinary Graduate School of Engineering Sciences, Kyushu University) Dr Masayuki Ono (PPPL/Princeton University) Ms Miyu Yunoki (Interdisciplinary Graduate School of Engineering Sciences, Kyushu University) Mr Naoki Matsumoto (University of Tokyo) Dr Nicola Bertelli (Princeton Plasma Physics Laboratory) Dr Osamu Watanabe (Research Institute for Applied Mechanics, Kyushu University) Mr Ryota Yoneda (Interdisciplinary Graduate School of Engineering Sciences, Kyushu University) Dr Sadayoshi Murakami (Departement Nuclear Engineering, Kyoto University) Mr Sakuji Kobayashi (National Institute for Fusion Science) Prof. Shin Kubo (National Institute for Fusion Science) Mr Shinichiro Kojima (Interdisciplinary Graduate School of Engineering Sciences, Kyushu University) Dr Takumi Onchi (Research Institute for Applied Mechanics, Kyushu University) Dr Toru Tsujimura (National Institute for Fusion Science) Prof. Tsuyoshi Imai (Plasma Research Center, University of Tsukuba) Dr Tsuyoshi Kariya (Plasma Research Center, University of Tsukuba) Dr Yoshihiko Nagashima (Research Institute for Applied Mechanics, Kyushu University) Prof. Yuichi Takase (University of Tokyo)

Presentation Materials