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Identification of plasma-edge-related operational regime boundaries and the effect of edge instability on confinement in ASDEX Upgrade

W Suttrop, M Kaufmann, H J de Blank, B Brüsehaber, K Lackner, V Mertens, H Murmann, J Neuhauser, F Ryter, H Salzmann1997年Plasma Physics and Controlled FusionIF 2.2出版社

Local edge parameters on the ASDEX Upgrade tokamak are investigated at the L-mode to H-mode transition, during phases with various types of edge-localized modes (ELMs), and at the density limit. A scaling law for the boundary electron temperature, , is found which describes the H-mode threshold for deuterium-puffed discharges with favourable ion -drift direction. The region of stable operation is bounded by type I ELMs near the ideal ballooning limit and by a minimum temperature necessary to avoid thermal instability of the plasma edge. Stationary operation with type III ELMs imposes an upper limit on the edge temperature. Within the entire range of boundary densities investigated , both L-mode and H-mode are found to be accessible. During type I ELMy H-mode, a relation of global confinement with the edge pressure gradient is found which is connected with a loss of the favourable density dependence predicted by the ITER-92P and ITER-93H ELMy H-mode scalings. At high density, better confinement is achieved in H-modes with an edge pressure gradient below the ideal ballooning limit, e.g. during type III ELMy H-mode with impurity-seeded radiation.

日本語訳

ASDEX Upgradeトカマクにおける局所的なプラズマ周辺部パラメータを、LモードからHモードへの遷移時、様々なタイプの周辺局在モード(ELM)を伴う位相中、および密度限界時において調査した。境界電子温度に関するスケーリング則が見出され、これは、イオン反転磁場方向を有する重水素ガス入射放電に対するHモード閾値を記述する。安定な運転領域は、理想バルーニング限界付近のタイプI ELMと、プラズマ周辺部の熱的不安定性を回避するために必要な最小温度によって境界づけられる。タイプIII ELMを伴う定常運転は、周辺部温度に上限を課す。調査した全境界密度範囲において、LモードとHモードの両方が到達可能であることが見出された。タイプI ELMを伴うHモード中には、周辺部圧力勾配と全体閉じ込めの関係が見出され、これはITER-92PおよびITER-93H ELMy Hモードスケーリングが予測する有利な密度依存性の喪失と関連している。高密度では、理想バルーニング限界以下の周辺部圧力勾配を有するHモード、例えば不純物放射を伴うタイプIII ELM Hモードにおいて、より良い閉じ込めが達成される。

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