Observation of Edge Instability Limiting the Pedestal Growth in Tokamak Plasmas

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.


Published in:
Physical Review Letters, 112, 115001
Year:
2014
Publisher:
American Physical Society
ISSN:
0031-9007
Laboratories:




 Record created 2017-09-30, last modified 2018-01-28


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