Influence of asymmetric energetic ion distributions on sawtooth stabilization

The effect of energetic asymmetrically distributed ions on the stability of the internal kink mode in tokamaks is analyzed. Circulating ions which intersect the resonant surface due to finite radial excursion contribute to the mode either in the region of favorable or unfavorable curvature depending on the sign of v(parallel to). Internal kink mode stabilization for predominantly cocirculating ion populations is consistent with the observation of long sawteeth using tangential coinjection of neutral beams in JT-60U [G. J. Kramer et al., Nucl. Fusion 40, 1383 (2000)]. Off-axis neutral beam heating emerges as a possible means of assisting sawtooth control in future fusion grade experiments.


Published in:
Physical Review Letters, 92, 18
Year:
2004
ISSN:
0031-9007
ISBN:
0031-9007
Laboratories:
SPC
CRPP




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


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