Optimized quasisymmetric stellarators are consistent with the Garren–Boozer construction

Landreman, Matt

doi:10.1088/1361-6587/ab19f6

Optimized quasisymmetric stellarators are consistent with the Garren–Boozer construction

Journal Article · Thu May 23 04:00:00 EDT 2019 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/ab19f6· OSTI ID:1597702

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Univ. of Maryland, College Park, MD (United States); University of Maryland

The majority of 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 demonstrate 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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Maryland, College Park, MD (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); Simons Foundation

Grant/Contract Number:: FG02-93ER54197

OSTI ID:: 1597702

Alternate ID(s):: OSTI ID: 23002199

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 7 Vol. 61; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Magnetic well and Mercier stability of stellarators near the magnetic axis Landreman, Matt; Jorge, Rogerio Journal of Plasma Physics, Vol. 86, Issue 5 https://doi.org/10.1017/s002237782000121x	journal	October 2020
Figures of merit for stellarators near the magnetic axis Landreman, Matt Journal of Plasma Physics, Vol. 87, Issue 1 https://doi.org/10.1017/s0022377820001658	journal	February 2021
Constructing stellarators with quasisymmetry to high order Landreman, Matt; Sengupta, Wrick arXiv https://doi.org/10.48550/arxiv.1908.10253	text	January 2019
Near-Axis Expansion of Stellarator Equilibrium at Arbitrary Order in the Distance to the Axis Jorge, R.; Sengupta, W.; Landreman, M. arXiv https://doi.org/10.48550/arxiv.1911.02659	text	January 2019
Ion-temperature-gradient stability near the magnetic axis of quasisymmetric stellarators Jorge, R.; Landreman, M. arXiv https://doi.org/10.48550/arxiv.2102.12390	text	January 2021
Constructing stellarators with quasisymmetry to high order Landreman, Matt; Sengupta, Wrick Journal of Plasma Physics, Vol. 85, Issue 6 https://doi.org/10.1017/s0022377819000783	journal	November 2019
Near-axis expansion of stellarator equilibrium at arbitrary order in the distance to the axis Jorge, R.; Sengupta, W.; Landreman, M. Journal of Plasma Physics, Vol. 86, Issue 1 https://doi.org/10.1017/s0022377820000033	journal	January 2020

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