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Modification of plasma rotation with resonant magnetic perturbations in the STOR-M tokamak

S Elgriw, Y Liu, A Hirose, C Xiao2016年Plasma Physics and Controlled FusionIF 2.2出版社

The toroidal plasma flow velocity of impurity ions has been significantly modified in the Saskatchewan Torus-Modified (STOR-M) tokamak by means of resonant magnetic perturbations (RMP). It has been found that the toroidal flow velocities of OV and CVI impurity ions change towards the co-current direction after the application of a current through a set of (l  =  2, n  =  1) RMP field coils. It has been observed that the reduction of the toroidal flow velocity is closely correlated to the reduction of the magnetohydrodynamic (MHD) fluctuation frequency measured by Mirnov coils. Modulation of the flow velocity has been achieved by switching the RMP current pulses. Non-resonant magnetic perturbations have also induced a much smaller change in the toroidal plasma flow. A theoretical model has been adopted to assess the contributions of different drift mechanisms to magnetic islands rotation in STOR-M.

日本語訳

トロイダルプラズマ流速度は、サスカチュワン・トーラス改修型(STOR-M)トカマクにおいて、共鳴磁気摂動を用いることにより大幅に変更された。共鳴磁気摂動コイルのセット(l = 2、n = 1)に電流を印加した後、OVおよびCVI不純物イオンのトロイダル流速度がコプラズマ電流方向へ変化することが見出された。トロイダル流速度の低減が、ミルノフコイルによって測定された磁気流体力学(MHD)揺動周波数の低減と密接に相関していることが観測された。流速度の変調は、共鳴磁気摂動電流パルスを切り替えることによって達成された。非共鳴磁気摂動もまた、トロイダルプラズマ流に、はるかに小さな変化を誘起した。STOR-Mにおける磁気島回転に対する異なるドリフト機構の寄与を評価するために、理論モデルが採用された。

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Magnetic perturbationResonant magnetic perturbationPlasma rotation
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