H-mode transition parameters on TCV
The H-mode transition for the ohmically heated Tokamak à configuration variable (TCV) Tokamak has been studied. The plasma parameters for all the transitions have been compiled into a database used to show the current operational limits for H-mode accessibility. To minimize the effect on H-mode threshold by the vessel wall conditioning, plasma elongation was varied from 1 to 1.8 and the plasma current was raised until H-mode was obtained. The plasma poloidal rotation was measured. The measurement was simultaneously performed for CIII and CV radiation corresponding to close to and inside the last closed flux surface, respectively. A clear jump in the poloidal velocity was observed at the H-mode transition corresponding to an increase in the inward electric field. The plasma rotation changes little during the twofold density increase during the edge localized mode (ELM) free period following the H-mode transition which implies that the change is directly related to the H-mode.
Bibliographic Reference: Article: Bulletin of the American Physical Society, Vol. 41 (1996) No. 7, pp. 1513-1514
Record Number: 199710418 / Last updated on: 1997-04-23
Original language: en
Available languages: en