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. Bondhalekar, 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, Y. Petrov, E. Rachlew, V. Riccardo, E. Righi, F. Rimini, M. Stamp, A.A. Tuccillo, D.-D. Zastrow, M. Zerbini

    Research output: Contribution to journalJournal articleResearchpeer-review

    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 the He-3 ion cyclotron resonance layer in D and He-4 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 approximate to30 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 using He-3 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
    JournalNuclear Fusion
    Volume44
    Issue number1
    Pages (from-to)33-46
    ISSN0029-5515
    DOIs
    Publication statusPublished - 2004

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