Optimization of quasisymmetric stellarators with self-consistent bootstrap current and energetic particle confinement

Landreman, Matt; Buller, Stefan; Drevlak, Michael

doi:10.48550/arxiv.2205.02914

Cited by 1 publication

(1 citation statement)

References 41 publications

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“…The first is the onaxis ι of the original NCSX design [4], while the second and third are substantially larger noble irrationals. It is known that QA becomes progressively more difficult to achieve as ι grows [23,24,25], so choosing two large ι target values serves as a challenging test for our methods, especially since we only consider the vacuum field. We initialize the optimization using the modular coil design parameters of NCSX [4,26], but add two planar coils per half field period.…”

Section: Optimization For Flexible Qa Configurationmentioning

confidence: 99%

Stellarator coil optimization supporting multiple magnetic configurations

Lee,

Paul,

Stadler

et al. 2022

Preprint

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We present a technique that can be used to design stellarators with a high degree of experimental flexibility. For our purposes, flexibility is defined by the range of values the rotational transform can take on the magnetic axis of the vacuum field while maintaining satisfactory quasisymmetry. We show that accounting for configuration flexibility during the modular coil design improves flexibility beyond that attained by previous methods. Careful placement of planar control coils and the incorporation of an integrability objective enhance the quasisymmetry and nested flux surface volume of each configuration. We show that it is possible to achieve flexibility, quasisymmetry, and nested flux surface volume to reasonable degrees with a relatively simple coil set through an NCSXlike example. This preliminary coil design is optimized to achieve three rotational transform targets and nested flux surface volumes in each magnetic configuration larger than the NCSX design plasma volume. Our work suggests that there is a tradeoff between flexibility, quasisymmetry, and volume of nested flux surfaces.

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