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000206266 005__ 20190228220036.0
000206266 037__ $$aPOST_TALK
000206266 245__ $$aScalings of nonlinearity in the edge plasma and its connection to transition thresholds
000206266 269__ $$a2014
000206266 260__ $$c2014
000206266 336__ $$aPosters
000206266 520__ $$aNonlinear 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 scalings of nonlinear transfer must be studied. Since the expected flow damping terms depend on ion collision rates and local safety factor, recent experiments on Alcator C-Mod explored the nonlinear drive at various values of the plasma current, density and auxiliary heating power. Nonlinear interactions of zonal flows in L-mode and both zonal flows and geodesic-acoustic modes in I-mode are estimated using bispectral as well as time-resolved methods based on gas-puff-imaging. Experiments were run in both H-mode-favorable and unfavorable geometries to compare threshold physics in L-H and L-I-H transitions.
000206266 700__ $$aCziegler, I.
000206266 700__ $$aEdlund, E.
000206266 700__ $$aHubbard, A.
000206266 700__ $$aHughes, J.W.
000206266 700__ $$aIrby, J.
000206266 700__ $$aTerry, J.
000206266 700__ $$0240123$$aTheiler, Christian Gabriel$$g176719
000206266 700__ $$aTynan, G.
000206266 7112_ $$a56th Annual Meeting of the APS Division of Plasma Physics$$cNew Orleans, Louisiana$$dOctober 27–31, 2014
000206266 909C0 $$pCRPP
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000206266 909CO $$ooai:infoscience.tind.io:206266$$pSB$$pposter
000206266 917Z8 $$x176719
000206266 937__ $$aEPFL-POSTER-206266
000206266 973__ $$aOTHER
000206266 980__ $$aPOSTER