Minimum magnetic curvature for resilient divertors using Compact Toroidal Hybrid geometry

Bader, Aaron; Hegna, C. C.; Cianciosa, Mark R.; Hartwell, G. J.

doi:10.1088/1361-6587/aab1ea

Title: Minimum magnetic curvature for resilient divertors using Compact Toroidal Hybrid geometry

Journal Article · Fri Mar 16 00:00:00 EDT 2018 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/aab1ea· OSTI ID:1426567

^[1]; Hegna, C. C. ^[1];

^[2]; Hartwell, G. J. ^[3]

Univ. of Wisconsin, Madison, WI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Auburn Univ., AL (United States)

The properties of resilient divertors are explored using equilibria derived from Compact Toroidal Hybrid (CTH) geometries. Resilience is defined here as the robustness of the strike point patterns as the plasma geometry and/or plasma profiles are changed. The addition of plasma current in the CTH configurations significantly alters the shape of the last closed flux surface and the rotational transform profile, however, it does not alter the strike point pattern on the target plates, and hence has resilient divertor features. The limits of when a configuration transforms to a resilient configuration is then explored. New CTH-like configurations are generated that vary from a perfectly circular cross section to configurations with increasing amounts of toroidal shaping. It is found that even small amounts of toroidal shaping lead to strike point localization that is similar to the standard CTH configuration. Lastly, these results show that only a small degree of three-dimensional shaping is necessary to produce a resilient divertor, implying that any highly shaped optimized stellarator will possess the resilient divertor property.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725; FG02-93ER54222

OSTI ID:: 1426567

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 60, Issue 5; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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