Fielding, SJ;Valovic, M;Carolan, PG;Gates, DA;Hunt, C;Leahy, P;Morris, AW

PLASMA PHYSICS AND CONTROLLED FUSION

H-modes on COMPASS-D with high-power ECRH

1998

May

Validated

1

WOS: 21 ()

TOKAMAK

731

735

Recent high-power electron-cyclotron resonance heating (ECRH) H-mode experiments on COMPASS-D have used fundamental high-power ECRH to access high densities. Within the operating range set by the H-mode density threshold and ECRH accessibility, H-mode power thresholds are significantly higher than expected from ITER scalings, and show a contrary dependence on density. Energy confinement is somewhat lower than that suggested by the present ITER scalings, but correction for incomplete RF absorption may be needed. Complex H-mode and ELM behaviour is observed.