Comparison of private flux region instability in conventional and super-X divertor configurations

Baver, D. A.; Myra, J. R.; Militello, F.; Moulton, D.

doi:10.1063/5.0063766

Comparison of private flux region instability in conventional and super-X divertor configurations

Journal Article · Tue Nov 23 00:00:00 EST 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0063766· OSTI ID:1832123

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Lodestar Research Corp., Boulder, CO (United States); Lodestar Research Corporation
Lodestar Research Corp., Boulder, CO (United States)
CCFE, Culham Science Centre, Abingdon (United Kingdom)

Understanding turbulence in the divertor leg of tokamaks is essential to predicting the heat deposition profile on the divertor plate. This in turn is important for evaluating advanced divertor configurations, such as the super-X divertor. Within the divertor region, the private flux region is of interest because it is relatively unaffected by turbulence extending from the outboard midplane, so instabilities in this region could have a particularly pronounced effect on transport. These instabilities are modeled using the Arbitrary Topology Equation Reader (ArbiTER) eigenvalue code. Eigenmodes are examined further by comparing physics models to determine the fundamental mechanisms behind their formation, and quantifying the effect of individual terms. This analysis is conducted on both conventional and super-X divertors to compare these effects. Here, the resulting analysis reveals the presence of a geodesic curvature driven instability that is significantly more pronounced in the super-X configuration.

View Accepted Manuscript (DOE)

Research Organization:: Lodestar Research Corp., Boulder, CO (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: SC0019270

OSTI ID:: 1832123

Alternate ID(s):: OSTI ID: 1832265

Report Number(s):: LRC-21-189; SC/0019270-2; EP/T012250/1

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 28; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Comparison of private flux region instability in conventional and super-X divertor configurations

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