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Impurity enrichment studies with induced scrape-off layer flow on DIII-D

M.R. Wade, J.T. Hogan, S.L. Allen, N.H. Brooks, D.N. Hill, R. Maingi, M.J. Schaffer, J.G. Watkins, D.G. Whyte, R.D. Wood1998年被引用 51Nuclear FusionIF 3出版社

A series of controlled experiments has been carried out in DIII-D to induce a bulk ion flow in the SOLand evaluate its effect on the localization of impurities in the divertor. This induced SOL flow was created bysimultaneous deuterium puffing and divertor exhaust using a divertor cryopump, and the impurity enrichment was measured directly. The experiments were designed to compare enrichment in discharges with and without induced flow having otherwisesimiliar divertor parameters. Significant increases in impurity compression and enrichment are observed when flow is induced, and the degree of impurity enrichment in the divertor is found to be dependent on the impurity of interest. Detailed particle measurements made possible by the direct measurement of impurity densities in several reservoirs indicate reasonable particle balance for helium throughout the duration of the discharge. Conversely, while the total input of neon is balanced by the total exhaust by the end of a discharge, particle balance is not observed during the course of the discharge. A significant wall inventory with a short release time (∼10 ms) is surmised.

日本語訳

DIII-Dにおいて、スクレイプオフ層(SOL)内のバルクイオンの流れを誘起し、ダイバータにおける不純物の局在化への影響を評価するため、一連の制御実験を実施した。この誘起されたSOL流は、重水素ガス入射とダイバータ・クライオポンプを用いた排気を同時に行うことで生成され、不純物濃縮度を直接測定した。実験は、他のダイバータパラメータが同様である条件下で、流れがある場合とない場合の濃縮度を比較するように設計された。流れを誘起すると、不純物の圧縮比と濃縮度が有意に増加し、ダイバータにおける不純物濃縮度の程度は対象とする不純物種に依存することが見出された。複数の領域における不純物密度の直接測定により可能となった詳細な粒子収支測定から、放電全体を通じてヘリウムについては良好な粒子バランスが確認された。対照的に、ネオンの場合、放電終了時には総入射量が総排気量と釣り合うものの、放電中には粒子バランスが成立しないことが観測された。短い放出時定数(約10 ms)を有する有意な壁インベントリの存在が推測される。

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diii-d高精度(タイトル一致)

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DIII-DImpurityScrape-off layer
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