Quasi-Coherent Fluctuations Limiting the Pedestal Growth on Alcator C-Mod: Experiment and Modeling

Dataset · Tue Mar 16 04:00:00 EDT 2021

DOI:https://doi.org/10.7910/DVN/1KHJ9H· OSTI ID:1881839

Diallo, A. ^[1]; Hughes, J. W.; Baek, S-G.; LaBombard, B.; Terry, J.; Cziegler, I.; Hubbard, A.; Davis, E.; Walk, J.; Delgado-Aparicio, L.; Reinke, M. L.; Theiler, C.; Churchill, R. M.; Edlund, E. M.; Canik, J.; Snyder, P.; Greenwald, M.; White, A.

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1. OSTI

Performance predictions for future fusion devices rely on an accurate model of the pedestal structure. The leading 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 (KBM). This work extends recent work on Alcator C-Mod [Diallo, et al., Phys. Rev. Lett., , (2014), 115001], to include detailed measurements of the edge fluctuations and comparisons of edge simulation codes and experimental observations.

• Research Organization: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Fusion Energy Sciences (FES)
• Contributing Organization: Alcator C-Mod Team
• DOE Contract Number: FC02-99ER54512; AC02-09CH11466
• OSTI ID: 1881839
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY