Stellarator coil optimization supporting multiple magnetic configurations

Nuclear Fushion

article

Brandon F. Lee¹  Elizabeth J. Paul¹  Georg Stadler⁵  Matt Landreman⁶ 

[1] Princeton Plasma Physics Laboratory, 100 Stellarator Road, Princeton;Department of Biomedical, Biological, and Chemical Engineering, University of Missouri;Department of Physics and Astronomy, University of Missouri, 701 South College Avenue;Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton;Courant Institute of Mathematical Sciences, New York University;Institute for Research in Electronics and Applied Physics, University of Maryland, 8223 Paint Branch Drive, College Park

关键词: stellarator;    optimization;    flexibility;    coil design;   

DOI  :  10.1088/1741-4326/aca10d

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

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 NCSX-like example. This example 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.

【 授权许可】

Unknown