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Confinement and profile changes induced by the presence of positive or negative radial electric fields in the edge of the TEXTOR tokamak

R.R. Weynants, G. van Oost, G. Bertschinger, J. Boedo, P. Brys, T. Delvigne, K.H. Dippel, F. Durodie, H. Euringer, K.H. Finken1992年被引用 199Nuclear FusionIF 3出版社

Edge radial electric fields were induced in the edge of the TEXTOR tokamak by means of a polarization electrode in order to study their influence on the plasma edge profiles and its confinement. The studies include the generation of H-mode behaviour with either positive or negative polarity. Particle confinement (τp) of deuterium and of impurity ions as well as energy confinement (τE) are investigated. For positive fields which remain below the threshold for the L-H transition, an interesting regime of reduced particle confinement without noticeable energy confinement loss is found. A strong asymmetry in the edge density profiles with respect to the electric field sign is observed at these low polarization voltages. Above the threshold, H-mode behaviour with increased energy confinement and especially particle confinement can be produced with either polarity of the applied electric field. It is, however, found that, whereas the energy confinement in positive H-modes is at least as good as that in negative ones, the ratio τp/τE is about three times lower in the former case

日本語訳

TEXTORトカマクの周辺部において、分極電極を用いて周辺部径方向電場を誘起し、プラズマ周辺部プロファイルとその閉じ込めに対する影響を研究した。研究には、正または負の極性によるHモード挙動の生成が含まれる。重水素および不純物イオンの粒子閉じ込め(τp)ならびにエネルギー閉じ込め(τE)を調査した。L-H遷移の閾値以下に留まる正の電場については、顕著なエネルギー閉じ込め損失を伴わない粒子閉じ込めの低下という興味深い領域が見出された。これらの低い分極電圧において、電場の符号に関して周辺部密度プロファイルに強い非対称性が観察された。閾値以上では、印加電場のいずれの極性によっても、エネルギー閉じ込めおよび特に粒子閉じ込めが向上したHモード挙動を生成できる。しかしながら、正のHモードにおけるエネルギー閉じ込めは負のHモードにおけるものと少なくとも同等に良好である一方、τp/τE比は前者の場合に約3倍低いことが見出された。

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textor高精度(タイトル一致)

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TEXTORRadial electric field
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