Omnigenous stellarators with improved ideal and kinetic ballooning stability

Gaur, R.; Conlin, R.; Dickinson, D.; Parisi, J. F.; Panici, D.; Dudt, D.; Kim, P.; Unalmis, K.; Dorland, W. D.; Kolemen, E.

doi:10.1088/1361-6587/ae1e9e

Title: Omnigenous stellarators with improved ideal and kinetic ballooning stability

Journal Article · Tue Dec 23 00:00:00 UTC 2025 · Plasma Physics and Controlled Fusion

DOI: https://doi.org/10.1088/1361-6587/ae1e9e · OSTI ID:3030193

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Princeton University, NJ (United States)
University of Maryland, College Park, MD (United States)
University of York (United Kingdom)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Thea Energy, Kearny Point, NJ (United States)
Princeton University, NJ (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Omnigenity is a property of a magnetic field which ensures confinement of trapped particles. It is a necessary requirement for any high-performance stellarator. After creating an omnigenous equilibrium, one must also ensure reduced transport resulting from kinetic and magnetohydrodynamic (MHD) instabilities. To this end, we leverage the GPU-accelerated DESC optimization suite, which is used to design stable, finite-β omnigenous equilibria with poloidal, toroidal, and helical symmetry, achieving Mercier, ideal ballooning, and as a consequence, improved kinetic ballooning stability. We discover stellarators with second stability, a regime of large pressure gradient where an equilibrium becomes ideal ballooning stable, and demonstrate and explore both using theory and gyrokinetic simulations the connection between ideal and kinetic ballooning stability.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: Simons Foundation; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 3030193

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 12 Vol. 67; ISSN 0741-3335; ISSN 1361-6587

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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