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Ferracin, P.; Ambrosio, G.; Anerella, M.; Arbelaez, D.; Brouwer, L.; Barzi, E.; Cooley, L. D.; Cozzolino, J.; Garcia Fajardo, L.; Gupta, R.; Juchno, M.; Kashikhin, V. V.; Kurian, F.; Marinozzi, V.; Novitski, I.; Rochepault, E.; Stern, J.; Vallone, G.; Yahia, B.; Zlobin, A.V.
IEEE transactions on applied superconductivity, 08/2023, Letnik: 33, Številka: 5Journal Article
Hybrid magnets are currently under consideration as an economically viable option towards 20 T dipole magnets for next generation of particle accelerators. In these magnets, High Temperature Superconducting (HTS) materials are used in the high field part of the coil with so-called "insert coils", and Low Temperature Superconductors (LTS) like Nb 3 Sn and Nb-Ti superconductors are used in the lower field region with so-called "outsert coils". The attractiveness of the hybrid option lays on the fact that, on the one hand, the 20 T field level is beyond the Nb 3 Sn practical limits of 15-16 T for accelerator magnets and can be achieved only via HTS materials; on the other hand, the high cost of HTS superconductors compared to LTS superconductors makes it advantageous exploring a hybrid approach, where the HTS portion of the coil is minimized. We present in this paper an overview of different design options aimed at generating 20 T field in a 50 mm clear aperture. The coil layouts investigated include the Cos-theta design (CT), with its variations to reduce the conductor peak stress, namely the Canted Cos-theta design (CCT) and the Stress Management Cos-theta design (SMCT), and, in addition, the Block-type design (BL) including a form of stress management and the Common-Coil design (CC). Results from a magnetic and mechanical analysis are discussed, with particular focus on the comparison between the different options regarding quantity of superconducting material, field quality, conductor peak stress, and quench protection.
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