Optimized quasisymmetric stellarators are consistent with the Garren-Boozer construction

TitleOptimized quasisymmetric stellarators are consistent with the Garren-Boozer construction
Publication TypeJournal Article
Year of Publication2019
AuthorsLandreman M
Journalarxiv.org
Date Published02/2019
Type of ArticlePlasma Physics (physics.plasm-ph)
Other Numbershttps://arxiv.org/abs/1902.01672
KeywordsPlasma Physics
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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