Journal article
Ion heat transport studies in JET
Max Planck Institute1
Association EURATOM-Belgian State2
Plasma Physics and Technology Programme, Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
Risø National Laboratory for Sustainable Energy, Technical University of Denmark4
University of Bayreuth5
Aalto University6
Fusion For Energy7
General Atomics8
VTT Technical Research Centre of Finland Ltd.9
Chalmers University of Technology10
United Kingdom Atomic Energy Authority11
Consorzio RFX12
Technical University of Lisbon13
Princeton Plasma Physics Laboratory14
EURATOM-ENEA sulla Fusione15
French Alternative Energies and Atomic Energy Commission16
Dutch Institute for Fundamental Energy Research17
KTH Royal Institute of Technology18
...and 8 moreDetailed experimental studies of ion heat transport have been carried out in JET exploiting the upgrade of active charge exchange spectroscopy and the availability of multi-frequency ion cyclotron resonance heating with 3He minority. The determination of ion temperature gradient (ITG) threshold and ion stiffness offers unique opportunities for validation of the well-established theory of ITG driven modes.
Ion stiffness is observed to decrease strongly in the presence of toroidal rotation when the magnetic shear is sufficiently low. This effect is dominant with respect to the well-known ωE×B threshold up-shift and plays a major role in enhancing core confinement in hybrid regimes and ion internal transport barriers.
The effects of Te/Ti and s/q on ion threshold are found rather weak in the domain explored. Quasi-linear fluid/gyro-fluid and linear/non-linear gyro-kinetic simulations have been carried out. Whilst threshold predictions show good match with experimental observations, some significant discrepancies are found on the stiffness behaviour.
Language: | English |
---|---|
Publisher: | IOP Publishing |
Year: | 2011 |
Pages: | 124033 (17pp) |
ISSN: | 13616587 and 07413335 |
Types: | Journal article |
DOI: | 10.1088/0741-3335/53/12/124033 |
ORCIDs: | Naulin, Volker |