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Energy confinement and MHD activity in shaped TCV plasmas with localized electron cyclotron heating

A. Pochelon, T.P. Goodman, M. Henderson, C. Angioni, R. Behn, S. Coda, F. Hofmann, J.-P. Hogge, N. Kirneva, A.A. Martynov1999年被引用 58Nuclear FusionIF 3出版社

Confinement in TCV electron cyclotron heated discharges was studied as a function of plasma shape, i.e. as a function of elongation, 1.1 < κ< 2.15, and triangularity, -0.65 ⩽ δ ⩽ 0.55. The electron energy confinement time was found to increase with elongation, owing in part to the increase of plasma current with elongation. The beneficial effect of negative triangularities was most effective at low power and tended to decrease at the higher powers used. The large variety of sawtooth types observed in TCV for different power deposition locations, from on-axis to the q = 1 region, was simulated with a model that included local power deposition, a growing m/n = 1 island (convection and reconnection), plasma rotation and finite heat diffusivity across flux surfaces. Furthermore, a model with local magnetic shear reproduced the experimental observation that the sawtooth period is at a maximum when the heating is close to the q = 1 surface.

日本語訳

TCVの電子サイクロトロン加熱放電における閉じ込めを、プラズマ形状、すなわち伸び率κ(1.1 < κ < 2.15)と三角変形度δ(-0.65 ⩽ δ ⩽ 0.55)の関数として調べた。電子エネルギー閉じ込め時間は、一部には伸び率の増加に伴うプラズマ電流の増加により、伸び率とともに増加することが見出された。負の三角変形度の有益な効果は低パワーで最も効果的であり、用いた高パワーでは減少する傾向があった。軸上からq = 1領域に至る様々なパワー堆積位置に対してTCVで観測された多種多様な鋸歯状振動は、局所パワー堆積、成長するm/n = 1島(対流と磁気リコネクション)、プラズマ回転、および磁束面を横切る有限熱拡散率を含むモデルでシミュレーションされた。さらに、局所磁気シアを考慮したモデルは、加熱がq = 1面に近いときに鋸歯状振動の周期が最大となるという実験観測を再現した。

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MagnetohydrodynamicsElectron cyclotron heatingTCVEnergy confinement
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