Minority and mode conversion heating in (He-3)-H JET plasmas

TitleMinority and mode conversion heating in (He-3)-H JET plasmas
Publication TypeJournal Article
Year of Publication2012
AuthorsD. Van Eester, E. Lerche, T.J Johnson, T. Hellsten, J. Ongena, M.L Mayoral, D. Frigione, C. Sozzi, G. Calabro, M. Lennholm, P. Beaumont, T. Blackman, D. Brennan, A. Brett, M. Cecconello, I. Coffey, A. Coyne, K. Crombe, A. Czarnecka, R. Felton, M.G Johnson, C. Giroud, G. Gorini, C. Hellesen, P. Jacquet, Y. Kazakov, V. Kiptily, S. Knipe, A. Krasilnikov, Y. Lin, M. Maslov, I. Monakhov, C. Noble, M. Nocente, L. Pangioni, I. Proverbio, M. Stamp, W. Studholme, M. Tardocchi, T.W Versloot, V. Vdovin, A. Whitehurst, E. Wooldridge, V. Zoita
JournalPlasma Physics and Controlled Fusion
Volume54
Issue7
Pagination074009
Date PublishedJul
Type of ArticleArticle
ISBN Number0741-3335
KeywordsION-CYCLOTRON, RESONANCE, TOKAMAK, WAVE
Abstract

Radio frequency (RF) heating experiments have recently been conducted in JET (He-3)-H plasmas. This type of plasmas will be used in ITER's non-activated operation phase. Whereas a companion paper in this same PPCF issue will discuss the RF heating scenario's at half the nominal magnetic field, this paper documents the heating performance in (He-3)-H plasmas at full field, with fundamental cyclotron heating of He-3 as the only possible ion heating scheme in view of the foreseen ITER antenna frequency bandwidth. Dominant electron heating with global heating efficiencies between 30% and 70% depending on the He-3 concentration were observed and mode conversion (MC) heating proved to be as efficient as He-3 minority heating. The unwanted presence of both He-4 and D in the discharges gave rise to 2 MC layers rather than a single one. This together with the fact that the location of the high-field side fast wave (FW) cutoff is a sensitive function of the parallel wave number and that one of the locations of the wave confluences critically depends on the He-3 concentration made the interpretation of the results, although more complex, very interesting: three regimes could be distinguished as a function of X[He-3]: (i) a regime at low concentration (X[He-3]

DOI10.1088/0741-3335/54/7/074009
Division

FP

Department

PDG

PID

5afe644491b42921b17bd4827511caac

Alternate TitlePlasma Phys. Control. Fusion

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