H-mode threshold power in TCV Ohmic plasmas

L-mode to H-mode (LH) transitions are observed in a large variety of plasma conditions in TCV Ohmic plasmas. The power flowing through the separatrix at the LH transition differs by up to a factor of two from the predicted H-mode threshold power. Variations in this deviation are due to the large operational domain covered by the transitions as well as from the different scenarios identified to access the H-mode regime. LH. transitions obtained during the plasma current ramp at low plasma current, elongation and triangularity have a threshold power below the standard expression while transitions at high current and triangularity or during the stationary phase of the discharge have a threshold power above the standard expression.


Published in:
Plasma Physics and Controlled Fusion, 44, A143-A150
Year:
2002
ISSN:
0741-3335
ISBN:
0741-3335
Note:
Suppl. 5A
Laboratories:
SPC
CRPP




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


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