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Observations of rotation in JET plasmas with electron heating by ion cyclotron resonance heating
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0002-7142-7103
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2012 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 54, no 7, 074007- p.Article in journal (Refereed) Published
Abstract [en]

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 harmonic He-3 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 (He-3)-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 of He-3 and with mode conversion at high concentrations of He-3. 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.

Place, publisher, year, edition, pages
2012. Vol. 54, no 7, 074007- p.
Keyword [en]
Cyclotron resonance, Electron temperature, Plasma simulation, Plasma waves, Rotation, Shear flow
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-99405DOI: 10.1088/0741-3335/54/7/074007ISI: 000305891500008Scopus ID: 2-s2.0-84863310853OAI: oai:DiVA.org:kth-99405DiVA: diva2:542171
Note
QC 20120730Available from: 2012-07-30 Created: 2012-07-30 Last updated: 2017-12-07Bibliographically approved

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