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

Cziegler, I.; Tynan, G. R.; Diamond, P. H.; Hubbard, A. E.; Hughes, J. W.; Irby, J.; Terry, J. L.

doi:10.1088/0029-5515/55/8/083007

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

Journal Article · Tue Jun 30 00:00:00 EDT 2015 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/55/8/083007· OSTI ID:1557847

Cziegler, I. ^[1]; Tynan, G. R. ^[1]; Diamond, P. H. ^[1]; Hubbard, A. E. ^[2]; Hughes, J. W. ^[2]; Irby, J. ^[2]; Terry, J. L. ^[2]

Univ. of California, San Diego, CA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

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].

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FC02-99ER54512; SC-0008689

OSTI ID:: 1557847

Alternate ID(s):: OSTI ID: 1238949

Journal Information:: Nuclear Fusion, Vol. 55, Issue 8; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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References (25)

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Invited Review Article: Gas puff imaging diagnostics of edge plasma turbulence in magnetic fusion devices Zweben, S. J.; Terry, J. L.; Stotler, D. P. Review of Scientific Instruments, Vol. 88, Issue 4 https://doi.org/10.1063/1.4981873	journal	April 2017
Magnetic configuration effects on the Reynolds stress in the plasma edge Manz, P.; Stegmeir, A.; Schmid, B. Physics of Plasmas, Vol. 25, Issue 7 https://doi.org/10.1063/1.5037511	journal	July 2018
Small amplitude oscillations before the L-H transition in EAST Shao, L. M.; Xu, G. S.; Chen, R. Plasma Physics and Controlled Fusion, Vol. 60, Issue 3 https://doi.org/10.1088/1361-6587/aaa57a	journal	February 2018
ECRH effect on the electric potential and turbulence in the TJ-II stellarator and T-10 tokamak plasmas Melnikov, A. V.; Krupnik, L. I.; Ascasibar, E. Plasma Physics and Controlled Fusion, Vol. 60, Issue 8 https://doi.org/10.1088/1361-6587/aac97f	journal	June 2018

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