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Adjoint methods for quasi-symmetry of vacuum fields on a surface
Published online by Cambridge University Press: 21 January 2022
Abstract
Adjoint methods can speed up stellarator optimisation by providing gradient information more efficiently compared with finite-difference evaluations. Adjoint methods are herein applied to vacuum magnetic fields, with objective functions targeting quasi-symmetry and a rotational transform value on a surface. To measure quasi-symmetry, a novel way of evaluating approximate flux coordinates on a single flux surface without the assumption of a neighbourhood of flux surfaces is proposed. The shape gradients obtained from the adjoint formalism are evaluated numerically and verified against finite-difference evaluations.
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- Copyright © The Author(s), 2022. Published by Cambridge University Press
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