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Evolution of lower hybrid driven current during the formation of an internal transport barrier

内部輸送障壁形成時における低域混成波駆動電流分布の時間発展

内藤 磨; Cui, Z.*; 井手 俊介; 鈴木 隆博; 及川 聡洋; 関 正美; 波多江 仰紀; 藤田 隆明; 近藤 貴; 白井 浩; 池田 佳隆; 牛草 健吉

Naito, Osamu; Cui, Z.*; Ide, Shunsuke; Suzuki, Takahiro; Oikawa, Toshihiro; Seki, Masami; Hatae, Takaki; Fujita, Takaaki; Kondoh, Takashi; Shirai, Hiroshi; Ikeda, Yoshitaka; Ushigusa, Kenkichi

負磁気シア放電中の内部輸送障壁(ITB)形成時における低域混成波(LH)駆動電流分布を測定した。ITBが成長するに従い、最初は中心にピークを持っていたLH駆動電流分布が中空の分布に移行し、時として中空な電子温度分布とITBに局在する鋸歯状振動様の不安定性を伴うことがあった。これらのことから、ITBにLHのパワーが集中し、一旦ITBが成長しだすとLH波による電流分布制御が困難になることが予想される。

Evolution of lower hybrid (LH) driven current profile was measured during the formation of internal transport barrier (ITB) in a reversed magnetic shear discharge. As the ITB developed, initially centrally peaked LH driven current profile gradually turned hollow and was sometimes accompanied by an off-axis peak in electron temperature profile followed by a sawtooth-like instability localized to the ITB. These observations indicate the concentration of LH power deposition at the ITB and suggest the difficulty of current profile control by LH waves once the ITB is established.

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パーセンタイル:47.36

分野:Physics, Multidisciplinary

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