ELMS and the H-mode pedestal in NSTX

JOURNAL OF NUCLEAR MATERIALS

卷:337

Article; Proceedings Paper

Maingi, R ; Sabbagh, SA ; Bush, CE ; Fredrickson, ED ; Menard, JE ; Stutman, D ; Tritz, K ; Bell, MG ; Bell, RE ; Boedo, JA ; Gates, DA ; Johnson, DW ; Kaita, R ; Kaye, SM ; Kugel, HW ; LeBlanc, BP ; Mueller, D ; Raman, R ; Roquemore, AL ; Soukhanovskii, VA ; Stevenson, T

关键词: ELM;    edge pedestal;    fueling;    NSTX;    particle control;   

DOI  :  10.1016/j.jnucmat.2004.08.023

来源: Elsevier

【 摘 要 】

We report on the behavior of ELMs in NBI-heated H-mode plasmas in NSTX. It is observed that the size of Type I ELMs, characterized by the change in plasma energy, decreases with increasing line-average density, as observed at conventional aspect ratio. It is also observed that the Type I ELM size decreases as the plasma equilibrium is shifted from a symmetric double-null toward a lower single-null configuration. Type II/III ELMs have also been observed in NSTX, as well as a high-performance regime with small ELMs which we designate Type V. The Type V ELMs are characterized by an intermittent n = 1 magnetic pre-cursor oscillation rotating counter to the plasma current; the mode vanishes between Type V ELMs crashes. Without active pumping, the density rises continuously through the Type V phase, albeit at a slower rate than ELM-free discharges. (c) 2004 Elsevier B.V. All rights reserved.

【 授权许可】

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