Training ML models on 12.4M VMEC stellarator equilibria shows that two boundary coefficients, RBC1,0 and ZBS1,0, have little effect on quasisymmetry and quasi-isodynamicity, and provides surrogate predictors for these omnigenity metrics.
Constructing precisely quasi-isodynamic magnetic fields
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abstract
We present a novel method for numerically finding quasi-isodynamic stellarator magnetic fields with excellent fast-particle confinement and extremely small neoclassical transport. The method works particularly well in configurations with only one field period. We examine the properties of these newfound quasi-isodynamic configurations, including their bootstrap currents, particle confinement, and available energy for trapped-electron driven turbulence, as well as the degree to which they change when a finite pressure profile is added. We finally discuss the differences between the magnetic axes of the optimized solutions and their respective initial conditions, and conclude with the prospects for future quasi-isodynamic optimization.
fields
physics.plasm-ph 1years
2025 1verdicts
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Data-Driven Approach to Model the Influence of Magnetic Geometry in the Confinement of Fusion Devices
Training ML models on 12.4M VMEC stellarator equilibria shows that two boundary coefficients, RBC1,0 and ZBS1,0, have little effect on quasisymmetry and quasi-isodynamicity, and provides surrogate predictors for these omnigenity metrics.