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Electron cyclotron resonance heating in the Wendelstein VII-A stellarator

V Erckmann, G Cattanei, D Dorst, A Elsner, U Gasparino, G Grieger, P Grigull, H Hacker, H J Hartfuss, H Jackel1986年Plasma Physics and Controlled FusionIF 2.2出版社

Plasma build-up and heating of net-current-free plasmas in W VII-A was investigated by ECRH. Experiments were performed at two ECR-frequencies (28 and 70 GHz) and different heating scenarios were investigated such as first harmonic ordinary mode heating and second harmonic extraordinary mode heating. The basic effects predicted by theory, i.e. localized wave absorption and optical thickness of the plasma were verified. The electron heat conduction was found to be governed by neoclassical losses in the plasma core for high enough temperatures, whereas enhanced losses have to be assumed in the outer plasma regions. Generation of a target plasma with sufficient parameters to allow further heating by NBI was successfully demonstrated. Configuration studies showed a beneficial influence of small shear on the confinement, where internal currents have to be taken into account.

日本語訳

W VII-Aにおけるネットカレントフリープラズマの生成と加熱をECRHにより調査した。実験は2つのECR周波数(28 GHzおよび70 GHz)で行われ、第一高調波の常波モード加熱や第二高調波の異常波モード加熱など、異なる加熱シナリオが検討された。理論によって予測された基本効果、すなわち局所的な波の吸収とプラズマの光学厚さが検証された。電子熱伝導は、高温のコア領域では新古典的な損失によって支配されることが見出された一方、外側のプラズマ領域では増大した損失を仮定する必要があることが示された。さらに、NBIによる追加加熱を可能にする十分なパラメータを有するターゲットプラズマの生成に成功した。配位の検討により、小さなシアーが閉じ込めに有益な影響を与えることが示され、その際には内部電流を考慮する必要があることが明らかになった。

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StellaratorElectron cyclotron heatingWendelsteinCyclotron resonanceElectron cyclotron resonance
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