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Nonlinear transfer in heated L-modes approaching the L–H transition threshold in Alcator C-Mod

Author(s)
Cziegler, I.; Tynan, G.R.; Diamond, P.H.; Hughes, J.W.; Hubbard, Amanda E; Irby, James Henderson; Terry, James L; ... Show more Show less
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Abstract
Nonlinear transfer processes between large-scale edge flows and the ambient broadband fluctuations have been shown to play a significant role in the dynamics of edge turbulence, including spreading power from coherent modes and suppressing turbulence at the formation of edge transport barriers. In order to predict thresholds of confinement regimes, both the transition dynamics and the parametric dependence of the nonlinear energy transfer must be studied. Since the expected flow damping terms depend on ion collision rates and local safety factors, recent experiments aimed also to explore the nonlinear drive at various values of the plasma current, density and amount of auxiliary heating. Nonlinear interactions between zonal flows and turbulence in L-mode are estimated using bispectral as well as time-resolved methods based on gas-puff-imaging in Alcator C-Mod [1].
Date issued
2015-06
URI
http://hdl.handle.net/1721.1/113227
Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Journal
Nuclear Fusion
Publisher
IOP Publishing
Citation
Cziegler, I. et al. “Nonlinear Transfer in Heated L-Modes Approaching the L–H Transition Threshold in Alcator C-Mod.” Nuclear Fusion 55, 8 (June 2015): 083007. © 2015 IAEA, Vienna
Version: Author's final manuscript
ISSN
0029-5515
1741-4326

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