Ion heat transport studies in JET

P. Mantica, C. Angioni, B. Baiocchi, M. Baruzzo, M.N.A. Beurskens, J.P.S. Bizarro, R.V. Budny, P. Buratti, A. Casati, C. Challis, J. Citrin, G. Colyer, F. Crisanti, A.C.A. Figueiredo, L. Frassinetti, C. Giroud, N. Hawkes, J. Hobirk, E. Joffrin, T. JohnsonE. Lerche, P. Migliano, V. Naulin, A.G. Peeters, G. Rewoldt, F. Ryter, A. Salmi, R. Sartori, C. Sozzi, G. Staebler, D. Strintzi, T. Tala, M. Tsalas, D. Van Eester, T. Versloot, P.C. DeVries, J. Weiland

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Abstract

Detailed 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 with3He 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×Bthreshold up-shift and plays a major role in enhancing core confinement in hybrid regimes and ion internal transport barriers. The effects of Te/Tiand 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. © 2011 IOP Publishing Ltd.
Original languageEnglish
Article number124033
Pages (from-to)-
JournalPlasma Physics and Controlled Fusion
Volume53
Issue number12
DOIs
Publication statusPublished - Dec 2011
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Mantica, P., Angioni, C., Baiocchi, B., Baruzzo, M., Beurskens, M. N. A., Bizarro, J. P. S., ... Weiland, J. (2011). Ion heat transport studies in JET. Plasma Physics and Controlled Fusion, 53(12), -. [124033]. https://doi.org/10.1088/0741-3335/53/12/124033