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High density experiments in TCV ohmically heated and L-mode plasmas

N A Kirneva, R Behn, G P Canal, S Coda, B P Duval, T P Goodman, B Labit, N A Mustafin, A N Karpushov, A Pochelon2015年Plasma Physics and Controlled FusionIF 2.2出版社

Recent experiments have been performed on the Tokamak à configuration variable (TCV) to investigate the confinement properties of high density plasmas and the mechanism behind the density limit. In a limiter configuration with plasma elongation and triangularity the operational density range has been extended up to 0.65 of the Greenwald density at  kA () and even to the Greenwald value at low plasma current  kA (). A transition from the linear to the saturated ohmic confinement regime is observed at high density . A further density increase leads to sawtooth stabilization and is accompanied by a decrease of the energy and particle confinement times. The development of the disruption at the density limit was preceded by sawtooth stabilization. It is shown that electron cyclotron heating leads to the prevention of sawtooth stabilization and then to the increase of the density limit value.

日本語訳

最近の実験は、可変配位トカマク(TCV)において、高密度プラズマの閉じ込め特性と密度限界のメカニズムを調べるために行われた。リミター配位で、プラズマ伸長度 および三角変形度 の場合、運転密度範囲はグリーンワルド密度の0.65まで拡張され、低プラズマ電流 kA () ではグリーンワルド値にまで達した。高密度 では、線形から飽和オーミック閉じ込め領域への遷移が観測された。さらに密度を増加させると、鋸歯状振動の安定化が起こり、エネルギーおよび粒子閉じ込め時間の減少を伴った。密度限界 でのディスラプションの発生は、鋸歯状振動の安定化が先行した。電子サイクロトロン加熱は鋸歯状振動の安定化を防ぎ、その結果密度限界値の増加につながることが示された。

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TCVOhmic heatingL-mode
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