Impurity feedback control for enhanced divertor and edge radiation in DIII-D discharges

JOURNAL OF NUCLEAR MATERIALS

卷:241

Article; Proceedings Paper

Jackson, GL ; Staebler, GM ; Allen, SL ; Brooks, NH ; Evans, TE ; Ferron, JR ; Leonard, AW ; Maingi, R ; Petrie, TW ; Schaffer, MJ ; Wood, RD ; West, WP ; Whyte, DG

关键词: DIII-D;    poloidal divertor;    radiation energy sink;   

DOI  :  10.1016/S0022-3115(97)80110-9

来源: Elsevier

【 摘 要 】

Radiated power fractions above 90% have been achieved in DIII-D using impurity feedback control. Heat flux reductions up to a factor of 6 and confinement enhancements of 1.6 x ITER-89P L-mode scaling have been obtained with a radiated power fraction above 90%. When the outer separatrix strike point was positioned for pumping with the DIII-D cryopump, ELMing H-mode (Type HI ELMs) was triggered with neon feedback injection in conjunction with a constant deuterium gas puff rate. Changes in the ELM frequency, energy confinement and central neon concentrations as a function of radiated power are presented. Observations of detached discharges with H-mode confinement similar to the ASDEX-U CDH-mode are also discussed.

【 授权许可】

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