Observations of rotation in JET plasmas with electron heating by ion cyclotron resonance heating

T. Hellsten, T.J. Johnson, D Van Eester, E. Lerche, Y. Lin, M.-L. Mayoral, J. Ongena, G. Calabro, K. Crombé, D. Frigione, C. Giroud, M. Lennholm, P. Mantica, M.F.F. Nave, V. Naulin, C. Sozzi, W. Studholme, T. Tala, T. Versloot

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Abstract

The rotation of L-mode plasmas in the JET tokamak heated by waves in the ion cyclotron range of frequencies (ICRF) damped on electrons, is reported. The plasma in the core is found to rotate in the counter-current direction with a high shear and in the outer part of the plasma with an almost constant angular rotation. The core rotation is stronger in magnitude than observed for scenarios with dominating ion cyclotron absorption. Two scenarios are considered: the inverted mode conversion scenarios and heating at the second harmonic3He cyclotron resonance in H plasmas. In the latter case, electron absorption of the fast magnetosonic wave by transit time magnetic pumping and electron Landau damping (TTMP/ELD) is the dominating absorption mechanism. Inverted mode conversion is done in (3He)-H plasmas where the mode converted waves are essentially absorbed by electron Landau damping. Similar rotation profiles are seen when heating at the second harmonic cyclotron frequency of3He and with mode conversion at high concentrations of3He. The magnitude of the counter-rotation is found to decrease with an increasing plasma current. The correlation of the rotation with the electron temperature is better than with coupled power, indicating that for these types of discharges the dominating mechanism for the rotation is related to indirect effects of electron heat transport, rather than to direct effects of ICRF heating. There is no conclusive evidence that mode conversion in itself affects rotation for these discharges. © 2012 IOP Publishing Ltd.
Original languageEnglish
Article number074007
Pages (from-to)-
JournalPlasma Physics and Controlled Fusion
Volume54
Issue number7
DOIs
Publication statusPublished - Jul 2012
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Hellsten, T., Johnson, T. J., Eester, D. V., Lerche, E., Lin, Y., Mayoral, M-L., ... Versloot, T. (2012). Observations of rotation in JET plasmas with electron heating by ion cyclotron resonance heating. Plasma Physics and Controlled Fusion, 54(7), -. [074007]. https://doi.org/10.1088/0741-3335/54/7/074007