Recent heating and current drive results on JET

A. Tuccillo, Y. Baranov, E. Barbato, Ph. Bibet, C. Castaldo, R. Cesario, W. Cocilovo, F. Crisanti, R. de Angelis, A. Ekedahl, A. Figueiredo, M. Graham, G. Granucci, D. Hartmann, J. Heikkinen, T. Hellsten, F. Imbeaux, T. Jones, T. Johnson, K. KirovP. Lamalle, M. Laxaback, F. Leuterer, X. Litaudon, P. Maget, J. Mailloux, M. Mantsinen, M. Mayoral, F. Meo, I. Monakhov, F. Nguyen, J.-M. Noterdaeme, V. Pericoli-Ridolfini, S. Podda, L. Paccione, E. Righi, F. Rimini, Y. Sarazin, A. Sibley, A. Staeber, Tuomas Tala, D. Van Eester, JET-EFDA collaborators

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    An overview is presented of the results obtained on JET by the Heating and Current Drive Task Force (TF-H) in the period May 2000—March 2001. A strongly improved Lower Hybrid (LH) coupling was achieved by optimizing the plasma shape and by controlling the local edge density via the injection of CD4. Up to 4 MW have been coupled in type III ELMy H-mode and/or on Internal Transport Barrier (ITB) plasmas with reflection coefficients as low as 4%. Long lasting quasi steady-state ITBs have been obtained by adding the LH current to the bootstrap and beam driven components. Furthermore the use of LH in the pre-heat phase results in electron temperature in excess of 10 keV, deep negative magnetic shear and strongly reduced power threshold for ITB formation. Preliminary results on ICRF coupling are reported including the effect of CD4 injection and the commissioning of the wide band matching system on ELMy plasmas. IC CD scenarios have been studied in H and 3He minority and used to modify the stability of the sawtooth to influence the formation of seed islands for the appearance of NTM. Up to 3 MW of IC power was coupled in the high magnetic field fast wave CD scenario. Preliminary MSE measurements indicate differences in the current profiles between -90° and +90° phasing. Careful measurements of the toroidal rotation, in plasmas heated by ICRF only show some dependence on the position of the resonance layer. Finally the use of ICRF minority heating under real-time control, in response to measured plasma parameters to simulate the effect of alpha particles, is presented. ICRF heating results in ITER non-activated scenarios are reported in a companion paper.
    Original languageEnglish
    Title of host publicationRadio Frequency Power in Plasmas
    Subtitle of host publication14th Topical Conference
    EditorsTak Kuen Mau, John de Grassie
    PublisherAmerican Institute of Physics AIP
    Pages209-216
    ISBN (Print)0-7354-0038-5
    DOIs
    Publication statusPublished - 2001
    MoE publication typeA4 Article in a conference publication
    Event14th Topical Conference of Radio Frequency Power in Plasmas - Oxnard, United States
    Duration: 7 May 20019 May 2001

    Publication series

    SeriesAIP Conference Proceedings
    Number1
    Volume595
    ISSN0094-243X

    Conference

    Conference14th Topical Conference of Radio Frequency Power in Plasmas
    CountryUnited States
    CityOxnard
    Period7/05/019/05/01

    Keywords

    • plasma diagnostics

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  • Cite this

    Tuccillo, A., Baranov, Y., Barbato, E., Bibet, P., Castaldo, C., Cesario, R., Cocilovo, W., Crisanti, F., de Angelis, R., Ekedahl, A., Figueiredo, A., Graham, M., Granucci, G., Hartmann, D., Heikkinen, J., Hellsten, T., Imbeaux, F., Jones, T., Johnson, T., ... JET-EFDA collaborators (2001). Recent heating and current drive results on JET. In T. Kuen Mau, & J. de Grassie (Eds.), Radio Frequency Power in Plasmas: 14th Topical Conference (pp. 209-216). American Institute of Physics AIP. AIP Conference Proceedings, No. 1, Vol.. 595 https://doi.org/10.1063/1.1424180