Study of giant edge-localized modes in DIII-D and comparison with ballooning theory

P. Gohil, M. Ali Mahdavi, L. Lao, K. H. Burrell, M. S. Chu, J. C. Deboo, C. L. Hsieh, N. Ohyabu, R. T. Snider, R. D. Stambaugh, R. E. Stockdale

Research output: Contribution to journalArticlepeer-review

126 Citations (Scopus)

Abstract

In DIII-D H-mode plasmas, large amplitude modulation of steep-edge electron-pressure gradients are observed during the occurrences of giant edge-localized modes (ELM's). For a considerable range of plasma currents (1 to 2 MA), the experimental pressure gradient before a giant ELM is close to the theoretically predicted marginal stability limit for the first regime of the ideal ballooning mode. These results, together with observations showing that ELM's originate in the region of bad curvature, strongly suggest that ELM's are triggered by ballooning mode instabilities.

Original languageEnglish
Pages (from-to)1603-1606
Number of pages4
JournalPhysical review letters
Volume61
Issue number14
DOIs
Publication statusPublished - 1988

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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