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Recent results from DIII-D and their implications for next generation tokamaks

J L Luxon, G Bramson, K H Burrell, N H Brooks, D Buchenauer, R W Callis, T N Carlstrom, C Challis, M S Chu, S Coda1990年Plasma Physics and Controlled FusionIF 2.2出版社

Recent results from the DIII-D tokamak have provided significant contributions to the understanding of many of the elements of tokamak physics and the application of this understanding to the design of next generation devices including ITER and CIT. The limitations of magnetohydrodynamic stability on the values of plasma beta (the ratio of kinetic pressure to the containing pressure of the magnetic field) that can be attained has been experimentally demonstrated and found to be described by existing theory. Values of beta (10.7%) well in excess of those required for proposed devices (ITER and CIT) have been demonstrated. Regimes of confinement (H-mode) have been established that scale favorably to proposed next generation devices, and experiments demonstrating the dependence of the energy confinement on plasma size have been completed. Understanding of confinement is rapidly developing especially in the areas of bulk transport and the role of turbulence in the plasma edge. Key experimental results in areas of plasma transport and edge plasma phenomena are in agreement with theories based on short wavelength turbulence. Control of the divertor heat loads and impurity influx has been demonstrated, and new progress has been made in the understanding of plasma edge phenomena. Experiments with ion Bernstein wave heating have not found regimes in which these waves can produce effective central ion heating. Electron cyclotron current drive experiments have demonstrated 70 kA of driven current in 400 kA discharges.

日本語訳

DIII-Dトカマクからの最近の結果は、トカマク物理の多くの要素の理解と、その理解のITERやCITを含む次世代装置の設計への応用に、重要な貢献をもたらしている。実験的に達成可能なプラズマベータ値(閉じ込め磁場の圧力に対する運動圧力の比)に対する磁気流体力学的安定性の限界が実証され、既存の理論によって記述されることが見出された。提案されている装置(ITERおよびCIT)に必要とされる値をはるかに超えるベータ値(10.7%)が実証された。次世代提案装置に好都合にスケーリングする閉じ込め領域(Hモード)が確立され、閉じ込めのエネルギー依存性を示す実験が完了した。閉じ込めの理解は、特にバルク輸送とプラズマ周辺部における乱流の役割の分野で急速に発展している。プラズマ輸送と周辺プラズマ現象の分野における主要な実験結果は、短波長乱流に基づく理論と一致している。ダイバータ熱負荷と不純物流入の制御が実証され、プラズマ周辺現象の理解において新たな進展がなされた。イオンバーンスタイン波加熱の実験では、これらの波が効果的な中心イオン加熱を生成できる領域は見出されなかった。電子サイクロトロン電流駆動実験では、400kAの放電において70kAの駆動電流が実証された。

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diii-d高精度(タイトル一致)iter中精度(概要文一致)

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