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Oct 13 – 18, 2014
Hotel Park Inn Pribaltiyskaya
Europe/Moscow timezone

Observation of Intermittent Plasma Ejection from a Highly Overdense Spherical Tokamak Plasma Maintained by Electron Bernstein Wave Heating and Current Drive in LATE

Oct 17, 2014, 8:30 AM
4h
Green 8-9 (Hotel Park Inn Pribaltiyskaya)

Green 8-9

Hotel Park Inn Pribaltiyskaya

Saint Petersburg, Russian Federation
Poster Poster 7

Speaker

Prof. Hitoshi Tanaka (Kyoto University)

Description

Non-inductive start-up of spherical tokamak (ST) is an important issue to realize compact and economical fusion reactors. In the Low Aspect ratio Torus Experiment (LATE) device, non-inductive start-up and formation of ST by electron Bernstein (EB) waves in a highly overdense regime has been explored. By injection of a 2.45 GHz microwave power of ~60 kW, the plasma current Ip is ramped up to ~12 kA and the electron density increases up to ~7 times the plasma cutoff density. Such a highly overdense ST plasma is produced by improved polarization adjustment for EB mode-conversion in the first propagation band. However, when Ip exceeds ~10 kA, Ip and the density become saturated. Intermittent plasma ejections across the last closed flux surface (LCFS) have been observed for the first time. Repetition of large ejection events causes saturation and gradual decrease of density and plasma current.
Paper Number EX/P7-41
Country or International Organisation Japan

Primary author

Prof. Hitoshi Tanaka (Kyoto University)

Co-authors

Ms Chiho Ikeda (Kyoto University) Mr Kengoh Kuroda (Kyoto University) Mr Kenichi Nagao (Kyoto University) Mr Manato Wada (Kyoto University) Dr Masaki Uchida (Kyoto University) Prof. Takashi Maekawa (Kyoto University) Mr Tatsuki Shigemura (Kyoto University)

Presentation materials