Stabilization of ion-temperature-gradient-driven tokamak modes by magnetic-field gradient reversal

Global gyrokinetic particle simulations have been used to search tokamak configurations which are stable again st the ion-temperature-gradient - driven (ITG) modes commonly held responsible for the core anomalous ion heat transport. The stable configurations are-characterized by strongly reduced or reversed del B drifts on the low-field side. Since excellent transport properties have been observed in high beta p (poloidal beta) tokamak experiments, we conjecture, as a result of our simulations, that this may be due to the stabilization of ITG modes by the reduction of the del B drifts.


Published in:
Physical Review Letters, 78, 18, 3471-3474
Year:
1997
ISSN:
0031-9007
ISBN:
0031-9007
Laboratories:
SPC
CRPP




 Record created 2008-04-16, last modified 2018-09-13


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