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Experimental study of ergodic edge plasmas with marfes in Tore Supra

W R Hess, C DeMichelis, M Mattioli, F Clairet, M Druetta, A Grosman, R Guirlet, T Hutter, J Lasalle, P Monier-Garbet1995年Plasma Physics and Controlled FusionIF 2.2出版社

High-density discharges with and without the ergodic divertor (ED) are compared. With increasing density the radiation maximum swings from the outside divertor modules to the inner wall. A strongly radiating cold plasma layer (an ergodic divertor marfe, ED-marfe) appears on the high-field side. Differing from the marfe in the limiter configuration, this ED-marfe has a poloidal extension of more than 120 degrees and can be run in steady-state conditions. It shows a poloidal structure with temperature modulations which reflect the magnetic structure of the divertor configuration. The modifications in the plasma edge electron temperature and density profiles are used for the identification of three different divertor regions with characteristic transport properties. At the plasma edge, within the stochastic region, a flat electron temperature profile is measured by Thomson scattering with temperatures as low as 20 eV. In this region, a positive radial electric field is deduced from rotation measurements. The importance of charge exchange (CX) processes due to a high neutral density in the radiating edge layer is shown. The neutral density within the ED-marfe and the ergodic region is estimated via CX-sensitive intensity ratios of carbon impurity ions. Densities of about 1018 m-3 in the marfe and 1016-1017 m-3 in the ergodic region are estimated.

日本語訳

高密度放電とエルゴディックダイバータ(ED)を有する場合と有しない場合を比較した。密度の増加に伴い、放射の最大値は外側ダイバータモジュールから内壁へと移動する。高磁場側には、強く放射する冷たいプラズマ層(エルゴディックダイバータ・マーフェ、ED-marfe)が現れる。リミター配位におけるマーフェとは異なり、このED-marfeはポロイダル方向に120度以上の広がりを持ち、定常状態で維持することができる。このED-marfeは、ダイバータ配位の磁気構造を反映した温度変調を伴うポロイダル構造を示す。プラズマ周辺部における電子温度と密度の分布の変化を用いて、特徴的な輸送特性を持つ3つの異なるダイバータ領域を同定した。確率磁場領域内のプラズマ周辺部では、トムソン散乱により測定された電子温度分布は平坦であり、その温度は20 eVまで低下する。この領域では、回転測定から正の径方向電場が推定される。放射する周辺層における高い中性粒子密度に起因する電荷交換(CX)過程の重要性が示された。ED-marfe内および確率磁場領域内の中性粒子密度は、炭素不純物イオンのCXに敏感な強度比を用いて推定された。マーフェ内では約10¹⁸ m⁻³、確率磁場領域内では10¹⁶〜10¹⁷ m⁻³の密度が推定された。

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Edge plasmaTore Supra
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