ICRF physics aspects of wall conditioning with conventional antennas in large-size tokamaks

A. Lyssoivan, R. Koch, D. Douai, J. M. Noterdaeme, V. Philipps, V. Rohde, F. C. Schüller, G. Sergienko, D. Van Eester, T. Wauters, T. Blackman, V. Bobkov, S. Brémond, S. Brezinsek, E. De La Cal, R. Dumont, M. Garcia-Munoz, E. Gauthier, M. Graham, S. JachmichE. Joffrin, A. Kreter, P. U. Lamalle, E. Lerche, G. Lombard, F. Louche, M. Maslov, M. L. Mayoral, V. E. Moiseenko, P. Mollard, I. Monakhov, J. Ongena, M. K. Paul, R. A. Pitts, V. Plyusnin, W. Suttrop, E. Tsitrone, M. Van Schoor, G. Van Wassenhove, M. Vervier

Research output: Contribution to journalArticlepeer-review

Abstract

This paper focuses on a study of the principal operation aspects of standard ICRF heating antennas in the ion cyclotron wall conditioning (ICWC) mode: (i) ability of the antenna to ignite the cleaning discharge safely and reliably in different gases including those most likely to be used in ITER - He, H2, D2 and their mixtures, (ii) the antenna capacity to couple a large fraction of the RF generator power (>50%) to low density (∼1016-1018 m-3) plasmas and (iii) the RF power absorption schemes aimed at improved RF plasma homogeneity and enhanced conditioning effect. The ICWC discharge optimization in terms of RF plasma wave excitation/absorption resulted in successful simulation of the conditioning scenarios for ITER operation at full field (JET) and half-field (TEXTOR, TORE SUPRA, ASDEX Upgrade).

Original languageEnglish
Pages (from-to)S1029-S1032
JournalJournal of Nuclear Materials
Volume415
Issue number1 SUPPL
DOIs
Publication statusPublished - 1 Aug 2011

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