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Optimized quasisymmetric stellarators are consistent with the Garren-Boozer construction
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abstract
Most quasisymmetric stellarators to date have been designed by numerically optimizing the plasma boundary shape to minimize symmetry-breaking Fourier modes of the magnetic field strength $B$. At high aspect ratio, a faster approach is to directly construct the plasma shape from the equations of quasisymmetry near the magnetic axis derived by Garren and Boozer [Phys Fluids B 3, 2805 (1991)]. Here we show that the core shape and rotational transform of many optimization-based configurations can be accurately described by this direct-construction approach. This consistency supports use of the near-axis construction as an accurate analytical model for modern stellarator configurations.
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Cited by 1 Pith paper
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Extending near-axis equilibria in DESC
The paper derives linear Fourier-Zernike constraints that make global DESC equilibria match a prescribed near-axis expansion through second order in the flux-surface radius.
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