@article{oai:nifs-repository.repo.nii.ac.jp:00011477,
 author = {LI, Yangbo and LIU, Haifeng and XU,  Yuhong and SHIMIZU,  Akihiro and KINOSHITA, Shigeyoshi and OKAMURA,  Shoichi and ISOBE,  Mitsutaka and XIONG, Guozhen and LUO, Yang and CHENG, Jun and LIU, Hai and WANG, Xianqu and HUANG, Jie and ZHANG, Xin and YIN, Dapeng and WAN, Yi and TANG, Changjian},
 issue = {12},
 journal = {Plasma Physics and Controlled Fusion},
 month = {Oct},
 note = {0000-0002-7635-2905, To date, almost all coil-design codes, e.g. NESCOIL, COILOPT, FOCUS codes, etc, have been primarily attributed to the optimization of filament coils for stellarators. However, evolving to a practical/finite-sized coil from a filament coil, the finite-size effect of coils significantly constrains the fabrication tolerances of a coil system. This paper presents a novel approach that emphasizes the optimization of practical modular coils to reduce sensitivity to fabrication tolerances and to achieve the expected magnetic configurations precisely. A new evaluation parameter, surface twist, is defined in this paper and applied to the optimization sequence in addition to the practical coil line torsion and curvature. The approach has been applied to the framework of the filament coil scheme in the Chinese first quasi-axisymmetric stellarator. This practical coil system without surface twists has been accomplished. Compared to the original finite-sized coil design, the new result is a more considerable simplification of coil shapes, such that in a certain direction view each finite-sized coil becomes a planar-like one. Moreover, this method can also be implemented for the estimation of stochastic deviations of practical coils during the fabrication and assembly of the coil system.},
 title = {Optimization of finite-sized modular coils for advanced stellarators},
 volume = {62},
 year = {2020}
}