ELM-related fluctuations in PBX-M H-modes

S. M. Kaye, J. L. Dunlap, T. S. Hahm, S. Sesnic, W. Tang, J. H. Harris, P. Roney, W. Davis

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9 Scopus citations

Abstract

Edge Localized Modes have been studied in PBX-M discharges with high data sampling rate magnetic diagnostics with good spatial coverage. High frequency (>or=250 kHz) activity appears prior to the increase in the Dalpha emission. While this high frequency activity is global, with high coherence for all coils both on the inside and outside midplane, there is no identifiable mode structure. A very intense outward ballooning feature appears simultaneously with the increase in the Dalpha emission, and lasts for about 5 msec. The toroidal mode structure of this feature is clearly identifiable, consisting of a series of toroidal harmonics from n=3 to 8, at frequencies given by fn=f0+n Delta f, where Delta f=20-30 kHz and f 0=30-50 kHz. This feature may be caused by the kinetic ballooning mode.

Original languageEnglish
Article number017
Pages (from-to)A135-A140
JournalPlasma Physics and Controlled Fusion
Volume36
Issue number7 A
DOIs
StatePublished - 1994

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