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Plasma convection induced by toroidal asymmetries of the divertor plates and gas puffing

R.H. Cohen, D.D. Ryutov1997年被引用 45Nuclear FusionIF 3出版社

In the open field line region of the scrape-off layer (SOL), the plasma potential is to a considerable degree determined by the boundary conditions on the divertor plates. The idea is explored here that, by making the divertor plates slightly `wavy' in the toroidal direction, toroidally varying potentials can be produced throughout the SOL and thereby convective plasma motion induced. This motion should lead to a broadening of the SOL and to a reduction of the heat load on the divertor plates. An attractive feature of this technique is that it induces strong convection only on the open field lines without causing enhanced transport inside the separatrix. The possibility is also considered of inducing plasma convection by varying the composition of the divertor plate in the toroidal and radial directions, so as to affect the plasma potential by virtue of the toroidal variation of the secondary emission coefficient. Mutual biasing of adjacent elements of the plates is the third option. Finally, the use of toroidally asymmetric gas puffing to induce toroidal asymmetry in the potential distribution is discussed

日本語訳

スクレイプオフ層(SOL)の開放磁力線領域において、プラズマ電位はダイバータ板における境界条件によってかなりの程度決定される。ここでは、ダイバータ板をトロイダル方向にわずかに「波状」にすることにより、SOL全体にトロイダル方向に変化する電位を生成し、それによってプラズマ対流運動を誘起できるという考えを探求する。この運動はSOLの拡大とダイバータ板への熱負荷の低減につながるはずである。この手法の魅力的な特徴は、セパラトリックス内部での輸送増強を引き起こすことなく、開放磁力線上の強い対流のみを誘起することである。また、ダイバータ板の組成をトロイダル方向およびラジアル方向に変化させ、二次電子放出係数のトロイダル方向の変化によってプラズマ電位に影響を与えることによる、プラズマ対流の誘起の可能性も考察する。板の隣接要素の相互バイアス印加が第3の選択肢である。最後に、トロイダル方向に非対称なガス入射を用いて、電位分布にトロイダル方向の非対称性を誘起する方法について議論する。

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