Control of Internal Profiles via LHCD on Alcator C-Mod
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Author(s)
Wilson, J. R.
Parker, Ronald R.
Bonoli, Paul T.
Hubbard, Amanda E.
Hughes, Jerry W.
Ince-Cushman, Alexander
Kessel, C.
Ko, J. S.
Meneghini, Orso-Maria Cornelio
Porkolab, Miklos
Date Issued
November 2009
Journal
AIP Conference Proceedings
Publisher
American Institute of Physics
Citation
Wilson, J. R. et al. “Control of Internal Profiles via LHCD on Alcator C-Mod.” in Radio frequency power in plasmas, edited by V. Bobkov and J.-M. Noterdaeme. (AIP Conf. Proc. v.1187, issue 1, 2009, p. 327-330). ©2009 American Institute of Physics.
Version
Final published version
Abstract
LHCD on Alcator C-Mod is being used in plasmas with parameters similar to those expected on ITER for the purpose of tailoring the plasma current profile. LHCD experiments have also produced intriguing results related to momentum transport and edge pedestal physics that affect the toroidal rotation profile and the temperature and density profiles. Quantitative comparisons between local measurements and theory/simulation have been performed, confirming the off-axis localization of the current drive, as well as its magnitude and location dependence on the launched n|| spectrum and electron temperature. Applying LHCD during the current ramp saves volt-seconds and delays the peaking of the current profile. Counter current toroidal rotation during LHCD has been observed in both L and H-mode plasmas. In H-mode plasmas the edge pedestal collisionality is reduced while the overall pressure in the pedestal increases slightly.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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
https://doi.org/10.1063/1.3273759
