Quasi-coherent fluctuations limiting the pedestal growth on Alcator C-Mod: experiment and modelling

Quasi-coherent fluctuations limiting the pedestal growth on Alcator C-Mod: experiment and modelling

Performance predictions for future fusion devices rely on an accurate model of the pedestal structure. The candidate for predictive pedestal structure is EPED, and it is imperative to test the underlying hypotheses to further gain confidence for ITER projections. Here, we present experimental work t...

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Bibliographic Details
Main Authors: Diallo, A., Terry, J., Cziegler, I., Delgado-Aparicio, L., Churchill, R.M., Edlund, E.M., Canik, J., Snyder, P., Hughes Jr, Jerry, Baek, Seung Gyou, Labombard, Brian, Hubbard, Amanda E, Davis, Evan Michael, Walk Jr, John R, Reinke, Matthew Logan, Theiler, Christian, Churchill, Randy Michael, Greenwald, Martin J, White, Anne E.
Other Authors: Massachusetts Institute of Technology. Plasma Science and Fusion Center
Format: Article
Published: IOP Publishing 2018
Online Access:http://hdl.handle.net/1721.1/117111
https://orcid.org/0000-0003-4802-4944
https://orcid.org/0000-0001-8029-3525
https://orcid.org/0000-0002-7841-9261
https://orcid.org/0000-0003-1039-6902
https://orcid.org/0000-0001-8324-4227
https://orcid.org/0000-0002-4438-729X
https://orcid.org/0000-0003-2951-9749
Description
Summary:Performance predictions for future fusion devices rely on an accurate model of the pedestal structure. The candidate for predictive pedestal structure is EPED, and it is imperative to test the underlying hypotheses to further gain confidence for ITER projections. Here, we present experimental work testing one of the EPED hypotheses, namely the existence of a soft limit set by microinstabilities such as the kinetic ballooning mode. This work extends recent work on Alactor C-Mod (Diallo et al 2014 Phys. Rev. Lett. 112 115001), to include detailed measurements of the edge fluctuations and comparisons of edge simulation codes and experimental observations.

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