Magnet-Sorting Algorithm for an Elliptically Polarized Undulator at TPS

• Published in: IEEE transactions on applied superconductivity Vol. 24; no. 3; pp. 1 - 5
• Main Authors: Chung, Ting-Yi, Chen, Sei-Da, Hwang, Ching-Shiang, Chang, Cheng-Hsing, Lin, Fu-Yuan, Huang, Jui-Che, Jan, Jyh-Chyuan, Chang, Cheng-Hsiang
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2014; Institute of Electrical and Electronics Engineers
• Subjects: Amorphous magnetic materials; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cost function; Domain effects, magnetization curves, and hysteresis; Exact sciences and technology; Inhomogeneity; magnet sorting; Magnetic properties and materials; Magnetization; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects; non unit effect; Permanent magnets; Physics; Sorting; Studies of specific magnetic materials; Superconducting magnets; undulator; Undulators; Performance evaluation; Magnetization; undulator; Elliptic polarization; Ferromagnetic materials; magnet sorting; Permanent magnets; Implementation; Optimization; Multipole field; Algorithms; Calcium nitride; non unit effect; Simulated annealing; Multipoles; Inhomogeneity; Phase error
• DOI: 10.1109/TASC.2013.2292941
• ISSN: 1051-8223

An effective initial sorting of permanent magnets can decrease the adverse effects of magnetic inhomogeneities and the imperfect geometry of blocks on the performance of an undulator. A sorting algorithm, based on simulated annealing, for the TPS EPU is implemented. The algorithm takes into account the magnetization of the blocks and the interactions between magnets. The field quality, including multipole, phase error, and particle trajectory, was optimized to within the specified tolerance. In this paper, we describe the sorting procedure and demonstrate the optimization results.