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Confinement studies on the Wendelstein VII-AS stellarator

H Ringler, U Gasparino, G Kuhner, H Maassberg, H Renner, F Sardei1990年Plasma Physics and Controlled FusionIF 2.2出版社

ECR heating at B0=2.5T has been extensively used in the 1990 experimental period of the W VII-AS stellarator. As it is a low-shear experiment the magnetic configuration (especially details of the rotational transform profile) depends sensitively on plasma currents (pressure driven, ohmic, EC driven, Ohkawa current) which in turn have a strong influence on energy and particle confinement properties. For the stationary phase a transport analysis has been performed, yielding the profiles of the electron heat conduction and the ion particle diffusion coefficients. The former was subjected to a statistical analysis resulting in phenomenological expressions for chi e and tau E. First experiments using neutral beam injection (ECRH target plasma) as well as combined heating (NBI+ECRH) are also discussed.

日本語訳

ECR加熱は、W VII-ASステラレーターの1990年の実験期間において、B0=2.5Tで広く使用された。低シア実験であるため、磁気配位(特に回転変換プロファイルの詳細)はプラズマ電流(圧力駆動、EC駆動、大久保電流)に敏感に依存し、これらはエネルギーおよび粒子閉じ込め特性に強い影響を及ぼす。定常位相について輸送解析が行われ、電子熱伝導率およびイオン粒子拡散係数のプロファイルが得られた。前者については統計解析が施され、χeおよびτeに対する経験式が導出された。また、中性粒子ビーム入射(ECRHターゲットプラズマ)を用いた最初の実験および複合加熱(NBI+ECRH)についても議論する。

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