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Spatially resolved toroidal plasma rotation with ICRF on JET
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2003 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 43, no 4, 274-289 p.Article in journal (Refereed) Published
Abstract [en]

Plasmas heated by ICRF only in the JET tokamak show distinct structures in the toroidal rotation profile, with regions where domega/dr > 0 when the minority cyclotron resonance layer is far off-axis. The rotation is dominantly co-current with a clear off-axis maximum. There is only a slight difference between a high-field side (HFS) or a low-field side position of this resonance layer: the off-axis maximum in the rotation profile is modestly higher for the HFS position. This is in contrast to the predictions of theories that rely mainly on the effects arising from ICRF-driven fast ions to account for ICRF-induced plasma rotation. The differences due to the direction of the antenna spectrum (co- or counter-) are small. A more central deposition of the ICRF power in L-mode and operation in H-mode both lead to more centrally peaked profiles, both in the co-direction. Strong MHD modes brake the rotation and lead to overall flat rotation profiles.

Place, publisher, year, edition, pages
2003. Vol. 43, no 4, 274-289 p.
Keyword [en]
alcator c-mod, fast alfven waves, ohmic h-mode, neoclassical transport, velocity distribution, ion temperature, heated plasmas, tokamak plasma, impurity, rf
URN: urn:nbn:se:kth:diva-22464DOI: 10.1088/0029-5515/43/4/309ISI: 000182570500009OAI: diva2:341162
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Hellsten, Torbjörn A. K.
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Alfvén Laboratory
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