The influence of MHD instabilities on the COMPASS-D H-mode threshold

S. J. Fielding, A. R. Field, M. Valovic, H. R. Wilson, P. G. Carolan, J. W. Connor, N. J. Conway, J. Dowling, B. Lloyd, A. W. Morris

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Significant improvements have been made to edge diagnostics on COMPASS-D enabling detailed studies of the H-mode dynamics. New experiments have been carried out with current ramps in high-power ECR discharges to test the influence of the peeling mode on the low-density H-mode transition. Observations and analysis suggest that the peeling mode is not the controlling mechanism. Density-ramp experiments indicate that the edge electron pressure gradient is correlated with transition behaviour and links are made with global observations.

Original languageEnglish
Pages (from-to)A191-A197
JournalPlasma Physics and Controlled Fusion
Volume42
Issue numberSUPPL. 5A
DOIs
StatePublished - 2000
Externally publishedYes

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