Observation of Self-Generated Flows in Tokamak Plasmas with Lower-Hybrid-Driven Current
Name
Ince-Cushman-2009-Observation of Self-.pdf
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Author(s)
Rice, John E.
Ince-Cushman, Alexander
Reinke, Matthew Logan
Greenwald, Martin J.
Wallace, Gregory Marriner
Bonoli, Paul T.
Shiraiwa, Shunichi
Marmar, Earl S.
Bitter, M.
Wilson, J.
Date Issued
January 2009
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Ince-Cushman, A. et al. “Observation of Self-Generated Flows in Tokamak Plasmas with Lower-Hybrid-Driven Current.” Physical Review Letters 102.3 (2009): 035002. © 2009 The American Physical Society
Version
Final published version
Abstract
In Alcator C-Mod discharges lower hybrid waves have been shown to induce a countercurrent change in toroidal rotation of up to 60 km/s in the central region of the plasma (r/a~<0.4). This modification of the toroidal rotation profile develops on a time scale comparable to the current redistribution time (~100 ms) but longer than the energy and momentum confinement times (~20 ms). A comparison of the co- and countercurrent injected waves indicates that current drive (as opposed to heating) is responsible for the rotation profile modifications. Furthermore, the changes in central rotation velocity induced by lower hybrid current drive (LHCD) are well correlated with changes in normalized internal inductance. The application of LHCD has been shown to generate sheared rotation profiles and a negative increment in the radial electric field profile consistent with a fast electron pinch.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.102.035002
