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Neoclassical tearing mode (NTM) magnetic spectrum and magnetic coupling in JET tokamak

M Baruzzo, B Alper, T Bolzonella, M Brix, P Buratti, C D Challis, F Crisanti, E de la Luna, P C de Vries, C Giroud2010年Plasma Physics and Controlled FusionIF 2.2出版社

An experimental study on the poloidal mode number (m) spectrum produced by a single toroidal mode number (n) neoclassical tearing mode (NTM) in the JET tokamak is presented. Clear evidence of the existence of more than one significant m component is given. The analysis is performed comparing several methods and diagnostics; among the latter we mention high frequency magnetic pick-up coils and an electron cyclotron emission radiometer, which measures detailed electron temperature radial profiles at high time resolution. The two diagnostics are also used together in a cross coherence calculation technique. The issue of the interaction of this multiple m structure with the plasma is addressed as well, with particular attention paid to plasma toroidal rotation and rotation shear, obtained from charge exchange spectroscopy data. This effect has been studied under two different operational plasma scenarios on JET in order to investigate both dependences on plasma parameters and consequences on the scenario itself.

日本語訳

JETトカマクにおける単一トロイダルモード数(n)の新古典テアリングモード(NTM)によって生成されるポロイダルモード数(m)スペクトルに関する実験的研究を提示する。複数の有意なm成分が存在するという明確な証拠が示される。この解析は、複数の手法と診断装置を比較して実施され、その中には高周波磁気ピックアップコイルや、高時間分解能で電子温度の動径分布を測定する電子サイクロトロン放射計が含まれる。また、これら2つの診断装置は、相互コヒーレンス計算手法においても併用される。この多重m構造とプラズマとの相互作用の問題も扱われており、特にプラズマのトロイダル回転および回転シアに注目し、これは電荷交換分光法のデータから得られる。この効果は、JETにおける2つの異なる運転プラズマシナリオの下で研究され、プラズマパラメータへの依存性とシナリオ自体への影響の両方を調査している。

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