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Effect of divertor bias on plasma flow in the DIII-D scrape-off layer

M.J. Schaffer, A. Mahdavi, C.C. Klepper, D.N. Hill, M.E. Rensink1992年被引用 31Nuclear FusionIF 3出版社

A toroidal ring bias electrode in contact with the single-null divertor scrape-off layer in the DIII-D tokamak achieved electric field control of plasma flow in the layer. Bias strongly altered the static pressure of neutralized gas in the new divertor chamber (designed for future pumping) during Ohmic, L-mode and ELMing H-mode plasma operation. The pressure increased or decreased, depending on the signs of the applied electric potential and toroidal magnetic field, in agreement with the E*B drift direction. The variation of the core plasma density was opposite to the variation of the pump chamber gas pressure and was proportionally much smaller. A large bias induced pressure rise appeared even when the scrape-off layer was not directed at the pump entrance aperture-a surprising effect that is interpreted qualitatively in terms of radial potential discontinuities. Bias also affected divertor heat fluxes, and preliminary observations are discussed qualitatively

日本語訳

単一ヌルダイバータ・スクレイプオフ層に接触するトロイダルリングバイアス電極は、DIII-Dトカマクにおいて層内のプラズマ流の電場制御を達成した。バイアスは、オーミック、Lモード、およびELMを伴うHモードプラズマ運転中に、新設ダイバータチャンバー(将来の排気用に設計)内の中性化ガスの静圧を強く変化させた。圧力は、印加電位とトロイダル磁場の符号に応じて増加または減少し、これはE×Bドリフト方向と一致した。コアプラズマ密度の変化は、ポンプチャンバーガス圧の変化とは逆であり、その割合ははるかに小さかった。スクレイプオフ層がポンプ入口開口部に向けられていない場合でも、大きなバイアス誘起圧力上昇が現れた——これは驚くべき効果であり、径方向電位不連続性の観点から定性的に解釈される。バイアスはまた、ダイバータ熱流束にも影響を与え、予備的観察結果について定性的に議論する。

装置

diii-d高精度(タイトル一致)

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DivertorDIII-DScrape-off layerPlasma flow
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