ELM studies on DIII-D and a comparison with ASDEX results

H. Zohm, T. H. Osborne, K. H. Burrell, M. S. Chu, E. J. Doyle, P. Gohil, D. N. Hill, L. L. Lao, A. W. Leonard, T. S. Taylor, A. D. Turnbull

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42 Citations (Scopus)

Abstract

In previous analysis of edge localized modes (ELMs), three different types (types I, II and III) of ELM were observed in DIII-D, whereas only one type of ELM has been found in ASDEX. The type III ELMs observed on DIII-D are similar to the ELMs observed on ASDEX, whereas the type I ELMs did not occur on ASDEX. ELMs are found to be MHD events of short duration (1 to 2 ms), which, on DIII-D, may be followed by a transient L mode phase. This compound event was not observed on ASDEX. A stability analysis of DIII-D discharges indicates that in the standard DIII-D configuration, type III ELMs occur well below the ideal ballooning limit, whereas Type I ELMs generally occur close to this limit. In DIII-D discharges where the plasma parameters are close to the ASDEX values, type I ELMs are not observed, even at the beta limit. This suggests that the ELM behaviour in DIII-D is not uniquely governed by ballooning stability.

Original languageEnglish
Article numberI05
Pages (from-to)543-550
Number of pages8
JournalNuclear Fusion
Volume35
Issue number5
DOIs
Publication statusPublished - 1995 Dec 1

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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