Nonlinear transfer in heated L-modes approaching the L–H transition threshold in Alcator C-Mod
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 o...
| Main Authors: | , , , , , , |
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| Format: | Article |
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IOP Publishing
2018
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| Online Access: | http://hdl.handle.net/1721.1/113227 |
| _version_ | 1826211013425364992 |
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| author | Cziegler, I. Tynan, G.R. Diamond, P.H. Hughes, J.W. Hubbard, Amanda E Irby, James Henderson Terry, James L |
| author2 | Massachusetts Institute of Technology. Plasma Science and Fusion Center |
| author_facet | Massachusetts Institute of Technology. Plasma Science and Fusion Center Cziegler, I. Tynan, G.R. Diamond, P.H. Hughes, J.W. Hubbard, Amanda E Irby, James Henderson Terry, James L |
| author_sort | Cziegler, I. |
| collection | MIT |
| description | 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]. |
| first_indexed | 2024-09-23T14:59:02Z |
| format | Article |
| id | mit-1721.1/113227 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T14:59:02Z |
| publishDate | 2018 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1132272022-09-29T11:53:33Z Nonlinear transfer in heated L-modes approaching the L–H transition threshold in Alcator C-Mod Cziegler, I. Tynan, G.R. Diamond, P.H. Hughes, J.W. Hubbard, Amanda E Irby, James Henderson Terry, James L Massachusetts Institute of Technology. Plasma Science and Fusion Center Hubbard, Amanda E Irby, James Henderson Terry, James L 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]. 2018-01-19T14:37:14Z 2018-01-19T14:37:14Z 2015-06 2015-05 2018-01-19T13:19:25Z Article http://purl.org/eprint/type/JournalArticle 0029-5515 1741-4326 http://hdl.handle.net/1721.1/113227 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 http://dx.doi.org/10.1088/0029-5515/55/8/083007 Nuclear Fusion 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. application/pdf IOP Publishing MIT Plasma Science & Fusion Center |
| spellingShingle | Cziegler, I. Tynan, G.R. Diamond, P.H. Hughes, J.W. Hubbard, Amanda E Irby, James Henderson Terry, James L Nonlinear transfer in heated L-modes approaching the L–H transition threshold in Alcator C-Mod |
| title | Nonlinear transfer in heated L-modes approaching the L–H transition threshold in Alcator C-Mod |
| title_full | Nonlinear transfer in heated L-modes approaching the L–H transition threshold in Alcator C-Mod |
| title_fullStr | Nonlinear transfer in heated L-modes approaching the L–H transition threshold in Alcator C-Mod |
| title_full_unstemmed | Nonlinear transfer in heated L-modes approaching the L–H transition threshold in Alcator C-Mod |
| title_short | Nonlinear transfer in heated L-modes approaching the L–H transition threshold in Alcator C-Mod |
| title_sort | nonlinear transfer in heated l modes approaching the l h transition threshold in alcator c mod |
| url | http://hdl.handle.net/1721.1/113227 |
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