Optimized quasisymmetric stellarators are consistent with the Garren–Boozer construction

Publication Year
2019
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.

Journal
Plasma Physics and Controlled Fusion
Volume
61
Issue
7
Date Published
05/2019
ISSN Number
1361-6587
Other Numbers
https://arxiv.org/abs/1902.01672
Category