Destabilization of fast-ion-induced long sawteeth by localized current drive in the JET tokamak

In a tokamak fusion reactor the energetic alpha particles will transiently stabilize the magnetohydrodynamic activity causing sawtooth oscillations. The crash events terminating long sawtooth free periods can provide seed islands for neoclassical tearing modes [O. Sauter et al., Phys. Rev. Lett. 88, 105001 (2002)]. To shorten the sawtooth periods localized current drive near the q=1 surface is a possibility. This Letter provides the first experimental evidence for the effectiveness of this method in the different physics regime associated with fast-ion-induced long sawteeth on the JET tokamak.


Published in:
Physical Review Letters, 92, 23
Year:
2004
ISSN:
0031-9007
Keywords:
Laboratories:
SPC
CRPP




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


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