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Effects of central electron cyclotron power on plasma rotation and on triggerless onset of NTMs in the TCV tokamak

E. Lazzaro, S. Nowak, O. Sauter, G. Canal, B. Duval, L. Federspiel, A.N. Karpushov, D. Kim, H. Reimerdes, J. Rossel2015年被引用 19Nuclear FusionIF 3出版社

Experiments in the TCV tokamak show that high power central electron cyclotron heating (ECH) and current drive (ECCD) produce significant direct modification of the plasma rotation profile, as well as an effect on the equilibrium current density profile. In a regime of unsteady rotation, these effects contribute to the onset of neoclassical tearing instabilities, in the absence of triggers such as sawteeth, edge localised modes (ELMS) or relevant 'error' fields. In turn the growing tearing modes' breaking axisymmetry provides a nonlinear magnetic torque which converts the power absorption in a co-directed rotation with a flattening of the profile at the rational surfaces. The experimental results are presented and discussed in the context of theoretical models of neoclassical toroidal viscosity and ion inertial effects.

日本語訳

TCVトカマクにおける実験により、高パワーの電子サイクロトロン加熱(ECH)および電子サイクロトロン電流駆動(ECCD)が、プラズマ回転分布の直接的な修正を有意に生じさせること、さらに平衡電流密度分布への影響も及ぼすことが示された。非定常回転の領域では、これらの効果は、鋸歯状振動、周辺局在化モード(ELM)、または関連する誤差磁場などのトリガーが存在しない場合においても、新古典テアリングモードの発生に寄与する。さらに、成長するテアリングモードによる軸対称性の破れは、非線形磁気トルクを生じさせ、これは電力吸収を同方向回転へと変換し、有理面における分布の平坦化を引き起こす。実験結果は、新古典粘性トルクおよびイオン慣性効果の理論モデルの観点から提示され、考察が加えられている。

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