A Method to Improve the Field Quality of the Curved Canted-Cosine-Theta Dipole

• Published in: IEEE transactions on applied superconductivity 2023-11, Vol.33 (8), p.1-6
• Main Authors: Wei, Shaoqing, Huang, Xingmeng, Li, Jiaxin, Zhang, Zhan, Liu, Fang, Liu, Huajun, Zheng, Jinxing, Song, Yuntao
• Format: Article
• Language: English
• Subjects: Bend radius; Bending; curved CCT dipole; Dipoles; Filing; Harmonic analysis; harmonic components; Higher harmonics; Magnetomechanical effects; Optimization; Plasma physics; Power cables; proton therapy gantry; Protons; Radiation therapy; Superconducting magnet; Superconducting magnets; Superconductivity; Symmetry; Toroidal magnetic fields; Windings
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2023.3309631

A proton therapy equipment named SC200 is developing in the Institute of Plasma Physics Chinese Academy of Sciences (IPP, CAS) and Hefei CAS Ion Medical and Technical Devices Co., Ltd. In order to develop a light weight gantry for proton therapy, the Canted Cosine theta (CCT) superconducting magnet was considered to apply in the superconducting gantry development. In this study, the magnetic field, and harmonic components of the curved CCT dipole were analyzed. As the curved CCT coil is no longer symmetric, there exist great high order harmonics. An optimization method to improve the field quality of the curved CCT dipole was presented. A symmetry curved CCT dipole, which was called S-curved CCT dipole, was approached in this study. With the S-curved CCT, all the integral high order harmonics can reach the requirement of 10 -4 . The design of the curved CCT dipole magnet with 2.67 T dipole field and 870 mm bending radius was introduced and analyzed in this study.