Greifswald 2024 – scientific programme

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P: Fachverband Plasmaphysik

P 5: Magnetic Confinement II/HEPP II

P 5.1: Talk

Monday, February 26, 2024, 16:30–16:55, ELP 6: HS 3

Searching for SQuIDs:*Stable Quasi-Isodynamic Designs for Stellarators — •Alan Goodman, Pavlos Xanthopoulos, Gabriel Plunk, Sophia Henneberg, Carolin Nuhremburg, Hakan Smith, Craig Beidler, Gareth Roberg-Clark, and Per Helander — Max-Planck-Institut fur Plasmaphysik, D-17491 Greifswald, Germany

Quasi-isodynamic (QI) stellarators are a uniquely attractive fusion reactor candidate due to their low neoclassical transport, excellent confinement of fusion-borne alpha particles, and vanishingly small bootstrap currents [1]. Due to the complexity of their geometries, QI stellarators must generally be designed through numerical optimization, which requires an objective metric that quantifies the degree to which a given design is QI. While once thought impossible, we recently showed that nearly-perfectly QI geometries can be found using an appropriately-designed objective function [2]. We have since built upon this approach, now finding QI geometries with reduced turbulence, improved MHD stability, and lower surface area-to-volume ratios, which are potential candidates for future stellarator experiments and reactors.

References:

[1] P Helander and J Nührenberg. Bootstrap current and neoclassical transport in quasi-isodynamic stellarators. PPCF (2009).

[2] A Goodman et al. Constructing precisely quasi-isodynamic magnetic fields, JPP (2023).

Keywords: optimization; stellarators; quasi-isodynamic; turbulence; plasma