Investigation of RF-enhanced plasma potentials on Alcator C-Mod
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Whyte_Investigation of RF-enhanced.pdf
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Author(s)
Cziegler, I.
Myra, J.
Ochoukov, Roman Igorevitch
Whyte, Dennis G.
Brunner, Daniel Frederic
Labombard, Brian
Lipschultz, Bruce
Terry, James L.
Wukitch, Stephen James
Date Issued
January 2013
Journal
Journal of Nuclear Materials
Publisher
Elsevier
Citation
Ochoukov, R., D.G. Whyte, D. Brunner, I. Cziegler, B. LaBombard, B. Lipschultz, J. Myra, J. Terry, and S. Wukitch. “Investigation of RF-Enhanced Plasma Potentials on Alcator C-Mod.” Journal of Nuclear Materials 438 (July 2013): S875–S878.
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Author's final manuscript
Abstract
Radio frequency (RF) sheath rectification is a leading mechanism suspected of causing anomalously high erosion of plasma facing materials in RF-heated plasmas on Alcator C-Mod. An extensive experimental survey of the plasma potential (Φ[subscript P]) in RF-heated discharges on C-Mod reveals that significant Φ[subscript P] enhancement (>100 V) is found on outboard limiter surfaces, both mapped and not mapped to active RF antennas. Surfaces that magnetically map to active RF antennas show Φ[subscript P] enhancement that is, in part, consistent with the recently proposed slow wave rectification mechanism. Surfaces that do not map to active RF antennas also experience significant Φ[subscript P] enhancement, which strongly correlates with the local fast wave intensity. In this case, fast wave rectification is a leading candidate mechanism responsible for the observed enhancement.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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DOI of Published Version
https://doi.org/10.1016/j.jnucmat.2013.01.189
