New method to design stellarator coils without the winding surface

Nuclear Fushion

article

Caoxiang Zhu¹  Stuart R. Hudson²  Yuntao Song³  Yuanxi Wan¹ 

[1] School of Nuclear Science & Technology and Department of Nuclear Science & Technology, University of Science and Technology of China;Princeton Plasma Physics Laboratory, Princeton University, PO Box 451, Princeton;Institute of Plasma Physics, Chinese Academy of Sciences

关键词: stellarator;    coil design;    nonlinear optimization;   

DOI  :  10.1088/1741-4326/aa8e0a

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

Finding an easy-to-build coils set has been a critical issue for stellarator design for decades. Conventional approaches assume a toroidal 'winding' surface, but a poorly chosen winding surface can unnecessarily constrain the coil optimization algorithm, This article presents a new method to design coils for stellarators. Each discrete coil is represented as an arbitrary, closed, one-dimensional curve embedded in three-dimensional space. A target function to be minimized that includes both physical requirements and engineering constraints is constructed. The derivatives of the target function with respect to the parameters describing the coil geometries and currents are calculated analytically. A numerical code, named flexible optimized coils using space curves (FOCUS), has been developed. Applications to a simple stellarator configuration, W7-X and LHD vacuum fields are presented.

【 授权许可】

Unknown