20 T Hybrid Nb3Sn-HTS Block-Coil Designs for a Future Particle Collider

Authors :: E. Rochepault
P. Ferracin
G. Vallone
Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU)
Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
Source :: IEEE Trans.Appl.Supercond., 27th International Conference on Magnet Technology, 27th International Conference on Magnet Technology, Nov 2021, Fukuoka, Japan. pp.4003505, ⟨10.1109/TASC.2022.3158643⟩
Publication Year :: 2022
Publisher :: Institute of Electrical and Electronics Engineers (IEEE), 2022.
Abstract: International audience; Future high energy particle colliders are under study, with a first goal of 16 T dipoles, which is believed to be the practical limit of Nb3Sn magnets. Another more ambitious goal is to aim for 20 T dipoles. This very high field would require High Temperature Superconductors (HTS), such as Bi2212 or REBCO. Their substantially higher cost necessitate anyways the use of Nb3Sn for an affordable accelerator application. Therefore, hybrid designs can be proposed, where the HTS are used in the high field (16–20 T) area, and Nb3Sn are used in the low field (3Sn-HTS design generating 20 T in the bore with margin, using a block-coil concept. Several conductor options are discussed. The design also proposes stress-management solutions to deal with the large stress developing in the coils.