Observation of Edge Instability Limiting the Pedestal Growth in Tokamak Plasmas
Author(s)
Diallo, A.; Davis, E.; Theiler, C.; Snyder, P.; Canik, J.; Walk, J.; Churchill, M.; Delgado-Aparicio, Luis; White, A.; Hughes, Jerry W., Jr.; Greenwald, Martin J.; Labombard, Brian; Baek, Seung Gyou; Walk, J.; Golfinopoulos, Theodore; Terry, James L.; Hubbard, Amanda E.; Porkolab, Miklos; Reinke, Matthew Logan; ... Show more Show less
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Show full item recordAbstract
With fusion device performance hinging on the edge pedestal pressure, it is imperative to experimentally understand the physical mechanism dictating the pedestal characteristics and to validate and improve pedestal predictive models. This Letter reports direct evidence of density and magnetic fluctuations showing the stiff onset of an edge instability leading to the saturation of the pedestal on the Alcator C-Mod tokamak. Edge stability analyses indicate that the pedestal is unstable to both ballooning mode and kinetic ballooning mode in agreement with observations.
Date issued
2014-03Department
Massachusetts Institute of Technology. Plasma Science and Fusion CenterJournal
Physical Review Letters
Publisher
American Physical Society
Citation
Diallo, A., J. W. Hughes, M. Greenwald, B. LaBombard, E. Davis, S-G. Baek, C. Theiler, et al. “Observation of Edge Instability Limiting the Pedestal Growth in Tokamak Plasmas.” Physical Review Letters 112, no. 11 (March 2014). © 2014 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114