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 language | English |
---|---|
Pages (from-to) | A191-A197 |
Journal | Plasma Physics and Controlled Fusion |
Volume | 42 |
Issue number | SUPPL. 5A |
DOIs | |
State | Published - 2000 |
Externally published | Yes |