Localized bulk electron heating with ICRF mode conversion in the JET tokamak

M.J. Mantsinen, M.-L. Mayoral, D. Van Eester, B. Alper, R. Barnsley, P. Beaumont, J. Bucalossi, I. Coffey, S. Conroy, M. De Baar, P. De Vries, K. Erents, A. Figueiredo, A. Gondhalekar, C. Gowers, T. Hellsten, E. Joffrin, V. Kiptily, P.U. Lamalle, K. LawsonA. Lyssoivan, J. Mailloux, P. Mantica, F. Meo, F. Milani, I. Monakhov, A. Murari, F. Nguyen, J.-M. Noterdaeme, J. Ongena, Yu. Petrov, E. Rachlew, V. Riccardo, E. Righi, F. Rimini, M. Stamp, A.A. Tuccillo, K.-D. Zastrow, M. Zerbini

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Abstract

Ion cyclotron resonance frequencies (ICRF) mode conversion has been developed for localized on-axis and off-axis bulk electron heating on the JET tokamak. The fast magnetosonic waves launched from the low-field side ICRF antennas are mode-converted to short-wavelength waves on the high-field side of the3He ion cyclotron resonance layer in D and4He plasmas and subsequently damped on the bulk electrons. The resulting electron power deposition, measured using ICRF power modulation, is narrow with a typical full-width at half-maximum of ≈30 cm (i.e. about 30% of the minor radius) and the total deposited power to electrons comprises at least up to 80% of the applied ICRF power. The ICRF mode conversion power deposition has been kept constant using3He bleed throughout the ICRF phase with a typical duration of 4-6 s, i.e. 15-40 energy confinement times. Using waves propagating in the counter-current direction minimizes competing ion damping in the presence of co-injected deuterium beam ions.
Original languageEnglish
Pages (from-to)33 - 46
Number of pages14
JournalNuclear Fusion
Volume44
Issue number1
DOIs
Publication statusPublished - Jan 2004
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Mantsinen, M. J., Mayoral, M-L., Van Eester, D., Alper, B., Barnsley, R., Beaumont, P., ... Zerbini, M. (2004). Localized bulk electron heating with ICRF mode conversion in the JET tokamak. Nuclear Fusion, 44(1), 33 - 46. https://doi.org/10.1088/0029-5515/44/1/004