Explaining Cold-Pulse Dynamics in Tokamak Plasmas Using Local Turbulent Transport Models
Author(s)
Grierson, B. A.; Staebler, G. M.; Yuan, X.; Creely, A. J.; Greenwald, M. J.; Rodriguez Fernandez, Pablo; White, Anne E.; Howard, Nathaniel Thomas; Cao, Norman; Creely, Alexander James; Hubbard, Amanda E; Hughes Jr, Jerry; Irby, James Henderson; Sciortino, Francesco; Rice, John E.; Greenwald, Martin J.; ... Show more Show less
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Show full item recordAbstract
A long-standing enigma in plasma transport has been resolved by modeling of cold-pulse experiments conducted on the Alcator C-Mod tokamak. Controlled edge cooling of fusion plasmas triggers core electron heating on time scales faster than an energy confinement time, which has long been interpreted as strong evidence of nonlocal transport. This Letter shows that the steady-state profiles, the cold-pulse rise time, and disappearance at higher density as measured in these experiments are successfully captured by a recent local quasilinear turbulent transport model, demonstrating that the existence of nonlocal transport phenomena is not necessary for explaining the behavior and time scales of cold-pulse experiments in tokamak plasmas.
Date issued
2018-02Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Plasma Science and Fusion CenterJournal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Rodriguez-Fernandez, P. et al. “Explaining Cold-Pulse Dynamics in Tokamak Plasmas Using Local Turbulent Transport Models.” Physical Review Letters 120, 7 (February 2018) © 2018 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114