Design and Analysis of the CCT Magnet with Slotless Former

The Canted-Cosine-Theta (CCT) magnet has the advantages of excellent field uniformity, no cumulative stress, flexible combination of multi-pole magnetic fields, and simple coil winding process, which have been used in the gantry of proton / heavy ion therapy and large particle colliders [1-3]. Usual...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2025-01, p.1-8
Main Authors: Li, Jiaxin, Lin, Zijie, Chu, Zhenyu, Liu, Yongsuo, Gao, Zhaoyao, Kan, Zhen, Zhang, Zhan, Wei, Shaoqing
Format: Article
Language:English
Subjects:
Canted-Cosine-Theta (CCT)
CCT with slotless former
Coils
Electromagnetics
Magnetic analysis
Magnetic separation
Magnetomechanical effects
Ribs
Stress
structural analysis
superconducting magnet
Superconducting magnets
Windings
Wire
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Summary:The Canted-Cosine-Theta (CCT) magnet has the advantages of excellent field uniformity, no cumulative stress, flexible combination of multi-pole magnetic fields, and simple coil winding process, which have been used in the gantry of proton / heavy ion therapy and large particle colliders [1-3]. Usually, CCT magnets are wound on the slotted former, in which the stress accumulation is prevented by the ribs. Due to the slotted former, the electromagnetic utilization of the superconducting wire is reduced. In this study, a slotless CCT magnet is proposed for further improving the electromagnetic efficiency and reducing the magnet size. The slotless CCT magnet eliminates the requirement to process the slotted former. Instead of the inner and outer slotted formers, the rib arrays are used to wind the CCT coils., and the magnet size is reduced in both axial and radial directions. In order to analyze and verify the feasibility of the slotless CCT magnet structure, this study optimized the magnet structure and compared the magnetic field and stress distribution between the CCT magnet with sloltess former and with slot former. Compared with the conventional CCT magnet, the central magnetic field of the slotless CCT magnet can be enhanced by 19.5% and the stresses are within an acceptable safe range in this study. The slotless CCT magnet contributes to the development of CCT magnets with greater magnetic fields and smaller volumes by both making the magnet construction more compact and reducing the magnet's weight.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2025.3531382