Investigation of Plasma Transport Processes Using the Dynamical Response of Soft-X-Ray Emission

The dynamical response of a soft X ray emission profile to different external perturbations - gas feed, impurity injection, RF power, surface loop voltage - has been studied on the TCA tokamak and analysed using a single technique. The frequency dependence of the response has been exploited to distinguish between the dominant transport processes. Remarkably similar phase response profiles were obtained with different stimuli; they show a link with sawtooth activity. The model that most plausibly explains these experimental observations requires diffusive transport with a diffusive coefficient locally modulated by the perturbation.


Published in:
Nuclear Fusion, 33, 8, 1185-1200
Year:
1993
ISSN:
0029-5515
Laboratories:
SPC
CRPP




 Record created 2008-04-16, last modified 2018-01-28


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