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Effects of divertor plate biasing on radial and poloidal edge fluxes in the TdeV

B. Terreault, P. Couture, B.L. Stansfield, C. Liu-Hinz, C. Boucher, E. Haddad, D. Michaud, G.G. Ross1992年被引用 24Nuclear FusionIF 3出版社

The divertor plates of TdeV, a tokamak with a double-null divertor and closed divertor chambers, have been electrically biased with respect to the walls. The authors discuss the resulting effects on the edge electron density profile, on the neutral pressures and impurity fluxes in the main vacuum chamber and the divertor chambers, and on the plasma flow to the divertors. As a function of the bias voltage, which was varied between-180 V and +160 V, the electron density scrape-off width and the wall impurity influxes increase monotonically; the flows to the top and bottom divertors vary strongly, in qualitative agreement with an E*B/B2 rotation, but not symmetrically. With negative biasing, the electrostatic barrier and the rotation combine to give a strong improvement of the divertor efficiency

日本語訳

TdeV(二重ヌルダイバータおよび閉鎖ダイバータチャンバーを有するトカマク)のダイバータ板は、壁に対して電気的にバイアスが印加された。著者らは、その結果生じる端部電子密度分布、主真空容器およびダイバータチャンバー内の中性粒子圧力と不純物フラックス、ならびにダイバータへのプラズマ流に対する影響について考察する。バイアス電圧を-180Vから+180Vの間で変化させた関数として、電子密度のスクレイプオフ層幅と壁への不純物入射フラックスは単調に増加する。上部および下部ダイバータへの流れは強く変化し、E×B/B²回転と定性的に一致するが、対称的ではない。負バイアス時には、静電障壁と回転が組み合わさり、ダイバータ効率の大幅な向上がもたらされる。

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