Design and construction of the MUSE permanent magnet stellarator

Qian, T. M.; Chu, X.; Pagano, C.; Patch, D.; Zarnstorff, M. C.; Berlinger, B.; Bishop, D.; Chambliss, A.; Haque, M.; Seidita, D.; Zhu, C.

doi:10.1017/S0022377823000880

Design and construction of the MUSE permanent magnet stellarator

Journal Article · Tue Oct 31 00:00:00 EDT 2023 · Journal of Plasma Physics

DOI:https://doi.org/10.1017/S0022377823000880· OSTI ID:2204299

; Chu, X.; Pagano, C.; Patch, D.; Zarnstorff, M. C.; Berlinger, B.; Bishop, D.; Chambliss, A.; Haque, M.; ;

This paper documents the design and construction of MUSE, the world's first permanent magnet (PM) stellarator and the first quasi-axisymmetric experiment. The purpose of MUSE is to develop and assess a new way of building optimised stellarators that uses simple planar coils PMs. Our PM optimisation algorithm consists of initialising a geometry to pack dipoles densely, running the FAMUS code to minimise surface field error subject to PM constraints and applying discrete jumps to reach a physically realisable solution. FAMUS treats the PM system as a set of ideal point dipoles. From there we construct finite-volume magnet towers to be housed in 3D-printed PM holders. We describe the design of the PM holders, which were validated by laser metrology. We analyse the effects of finite permeability, sensitivity to perturbations and magnetostatic forces. An exact analytic formula for the magnetic field from a finite-volume PM tower is presented to compute PM–PM forces and stress on the PM holder. Stellarator construction is complete and experiments are underway.

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Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 2204299

Alternate ID(s):: OSTI ID: 2248045

Journal Information:: Journal of Plasma Physics, Journal Name: Journal of Plasma Physics Journal Issue: 5 Vol. 89; ISSN 0022-3778

Publisher:: Cambridge University Press (CUP)Copyright Statement

Country of Publication:: United Kingdom

Language:: English

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