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Study of an edge transport barrier by Langmuir probes in the compact helical system

M Takeuchi, K Toi, K Nagaoka, C Suzuki, T Minami, T Akiyama, M Isobe, Y Yoshimura, S Nishimura, A Shimizu2006年Plasma Physics and Controlled FusionIF 2.2出版社

The edge transport barrier (ETB) produced by the L–H transition was measured by a triple Langmuir probe (LP) at two toroidal sections of the compact helical system (CHS), of which diagnostic method has good time and spatial resolutions. The radial profiles of electron density (ne), electron temperature (Te) and space potential (Vs) in the ETB region have different shapes at two different toroidal sections. These profiles are deformed inside the ETB region at one location and are formed with rather smooth variations at the other. These deformations gradually disappear in the deep H-phase (after ∼15 ms from the transition) and the profiles inside the ETB become similar at both sections. The deformation seems linked to the presence of a non-rotating magnetic island at the rational surface of the rotational transform ι/2π = 1.

日本語訳

周辺輸送障壁(ETB)は、L–H遷移によって生成され、コンパクトヘリカルシステム(CHS)の2つのトロイダル断面において、三重ラングミュアプローブ(LP)を用いて測定された。この診断方法は、優れた時間分解能と空間分解能を有する。ETB領域における電子密度(ne)、電子温度(Te)、および空間電位(Vs)の動径分布は、2つの異なるトロイダル断面において異なる形状を示した。これらの分布は、一方の位置ではETB内部で変形している一方、他方では比較的滑らかな変化を示した。これらの変形は、深いHモード位相(遷移から約15 ms後)において徐々に消失し、ETB内部の分布は両断面で類似したものとなった。この変形は、回転変換ι/2π = 1の有理面における非回転磁気島の存在と関連していると考えられる。

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Transport barrierLangmuir probeEdge transportCompact Helical SystemHelical system
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