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Processes in SOL plasma at the transition into improved confinement mode in FT-2 tokamak

S I Lashkul, V N Budnikov, V V Dyachenko, P R Goncharov, L A Esipov, E R Its, M Yu Kantor, D V Kouprienko, A D Lebedev, S V Shatalin2002年Plasma Physics and Controlled FusionIF 2.2出版社

Studies of processes in the scrape-off layer (SOL) of the tokamak show a direct influence of periphery effects on confinement parameters of the plasma core. This paper illustrates experimentally observed transport barrier formation initialized by the low hybrid (LH) heating of the hydrogen plasma. The experimental data near last close flax surface (LCFS) and in SOL were obtained by means of an enhanced movable multielectrode Langmuir probe and spatially resolved spectroscopic technique retooled with additional helium puffing. The edge diagnostics show a strong change of a radial electric field and plasma parameters near LCFS. The alteration at the plasma edge is generated by high LH ion heating. It was found that the L-H transition is accompanied by a noticeable reconstruction of the poloidal and radial plasma parameters profiles in the SOL and in the limiter shadow region.

日本語訳

トカマクのスクレイプオフ層(SOL)におけるプロセスの研究は、プラズマコアの閉じ込めパラメータに対する周辺部効果の直接的な影響を示している。本論文は、水素プラズマの低ハイブリッド(LH)加熱によって開始される輸送障壁の実験的に観測された形成を説明する。最終閉塞面(LCFS)近傍およびSOLにおける実験データは、追加のヘリウムガス入射を伴う改良型可動多電極ラングミュアプローブおよび空間分解分光技術を用いて取得された。周辺部診断は、LCFS近傍における径方向電場およびプラズマパラメータの大きな変化を示している。プラズマ周辺部の変化は、高いLHイオン加熱によって生成される。L-H遷移は、SOLおよびリミター影領域におけるポロイダルおよび径方向のプラズマパラメータ分布の顕著な再構築を伴うことが見出された。

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Scrape-off layerImproved confinement
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