Non-resonant destabilization of (1/1) internal kink mode by suprathermal electron pressure
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Non-resonant.pdf
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1.35 MB
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Author(s)
Delgado-Aparicio, L.
Sugiyama, L.
Gates, D. A.
Gorelenkov, N.
Scott, S.
Bertelli, N.
Phillips, P. E.
Rowan, W. L.
Wilson, R.
Wukitch, S.
Date Issued
May 2015
Journal
Physics of Plasmas
Publisher
American Institute of Physics (AIP)
Citation
Delgado-Aparicio, L. et al. “Non-Resonant Destabilization of (1/1) Internal Kink Mode by Suprathermal Electron Pressure.” Physics of Plasmas 22, 5 (May 2015): 050701 © 2015 AIP Publishing LLC
Version
Author's final manuscript
Abstract
New experimental observations are reported on the structure and dynamics of short-lived periodic (1, 1) "fishbone"-like oscillations that appear during radio frequency heating and current-drive experiments in tokamak plasmas. For the first time, measurements can directly relate changes in the high energy electrons to the mode onset, saturation, and damping. In the relatively high collisionality of Alcator C-Mod with lower hybrid current drive, the instability appears to be destabilized by the non-resonant suprathermal electro n pressure - rather than by wave-particle resonance, rotates toroidally with the plasma and grows independently of the (1, 1) sawtooth crash driven by the thermal plasma pressure.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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/10.1063/1.4919964
