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Power requirements for electron cyclotron current drive and ion cyclotron resonance heating for sawtooth control in ITER
- Source :
- Nuclear Fusion, v.53 (2013), Nuclear Fusion
- Publication Year :
- 2013
- Publisher :
- IOP Publishing, 2013.
-
Abstract
- 13MW of electron cyclotron current drive (ECCD) power deposited inside the q = 1 surface is likely to reduce the sawtooth period in ITER baseline scenario below the level empirically predicted to trigger neo-classical tearing modes (NTMs). However, since the ECCD control scheme is solely predicated upon changing the local magnetic shear, it is prudent to plan to use a complementary scheme which directly decreases the potential energy of the kink mode in order to reduce the sawtooth period. In the event that the natural sawtooth period is longer than expected, due to enhanced alpha particle stabilisation for instance, this ancillary sawtooth control can be provided from > 10MW of ion cyclotron resonance heating (ICRH) power with a resonance just inside the q = 1 surface. Both ECCD and ICRH control schemes would benefit greatly from active feedback of the deposition with respect to the rational surface. If the q = 1 surface can be maintained closer to the magnetic axis, the efficacy of ECCD and ICRH schemes significantly increases, the negative effect on the fusion gain is reduced, and off-axis negative-ion neutral beam injection (NNBI) can also be considered for sawtooth control. Consequently, schemes to reduce the q = 1 radius are highly desirable, such as early heating to delay the current penetration and, of course, active sawtooth destabilisation to mediate small frequent sawteeth and retain a small q = 1 radius.<br />29 pages, 16 figures
- Subjects :
- Physics
Nuclear and High Energy Physics
Rational surface
Cyclotron
FOS: Physical sciences
Alpha particle
Sawtooth wave
Electron
Condensed Matter Physics
01 natural sciences
Potential energy
Physics - Plasma Physics
Neutral beam injection
010305 fluids & plasmas
Computational physics
law.invention
Plasma Physics (physics.plasm-ph)
Ion cyclotron resonance heating
law
0103 physical sciences
010306 general physics
Subjects
Details
- ISSN :
- 17414326 and 00295515
- Volume :
- 53
- Database :
- OpenAIRE
- Journal :
- Nuclear Fusion
- Accession number :
- edsair.doi.dedup.....6be8f9e173a51f783d7a30a76dac5e78