Comparison of plasma parameters between QH and ELMing phases of the same discharges

JOURNAL OF NUCLEAR MATERIALS

卷:337

Article; Proceedings Paper

Lasniera, CJ ; West, WP ; Burrell, KH ; deGrassie, JS ; Doyle, EJ ; Osborne, TH

关键词: DIII-D;    divertor;    edge pedestal;    SOL plasma boundary;   

DOI  :  10.1016/j.jnucmat.2004.10.059

来源: Elsevier

【 摘 要 】

H-mode confinement is observed for many energy confinement times without edge localized modes (ELMs) in QH (quiescent high-confinement)-mode discharges in DIII-D. To determine the critical differences between ELMing and QH modes we compared electron temperature (T-e), density (n(e)), and ion temperature (T-i), in the pedestal (ped) and scrape-off layer (SOL) for a group of discharges. We also compared the electron pressures P-ped, and maximum pressure gradient del(max)P(e,ped) because of their importance in confinement and stability. Experimental results show that the core line averaged density, median T-e,T-ped, T-e,T-SOL, and T-e,T-ped width, and T-i,T-SOL are nearly the same in QH mode as that during ELMs. The n(e,ped) (average), n(e,ped) widths P-ped, and del(max)P(e,ped) are similar to corresponding values in QH mode and at various times between ELMs. However, the median T-i,T-ped is 1.6 times higher in QH mode than during ELMing. (c) 2004 Elsevier B.V. All rights reserved.

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