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Sawtooth and neocla...
Abstract
Ämnesord
Stäng
- In recent experiments at JET, ICRF waves were used to either stabilise or destabilise sawteeth, and consequently control the formation of the seed island responsible for the appearance of Neoclassical Tearing Modes (NTMs) known to limit the tohamak performance. Two scenarios were studied in deuterium plasmas with a hydrogen concentration of 5 to 10 %. Firstly, using a toroidal magnetic field B-0 of 2.5T, the fundamental hydrogen cyclotron resonance layer (omega=omega(cH)) was positioned at the High Field Side (HFS) at the sawtooth inversion radius (R(inv)similar toR(q=1)). With +90degrees phased wave, monster sawteeth were obtained that triggered NTMs. Secondly, ICRF waves at the 2(nd) harmonic hydrogen cyclotron resonance (omega=2omega(cH)) positioned at the Low Field Side (LFS) with B-0 between 1.2T and 1.6T, was used to reduce the sawtooth period and increase the NTM beta(n) onset level.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Nyckelord
- TOKAMAK
- STABILIZATION
- Plasma physics
- Plasmafysik
Publikations- och innehållstyp
- ref (ämneskategori)
- kon (ämneskategori)
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