Conceptual Design of 20 T Hybrid Accelerator Dipole Magnets

• Published in: IEEE transactions on applied superconductivity Vol. 33; no. 5; pp. 1 - 7
• Main Authors: 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.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Coils; Conceptual design; Conductors; dipole magnets; Dipoles; High temperature; High-temperature superconductors; HTS; hybrid magnet; hybrid magnets; Low temperature; Magnetic analysis; Magnetic tunneling; Magnetomechanical effects; Magnets; Mechanical analysis; Nb3Sn magnets; Nb<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> _3</tex-math> </inline-formula> </named-content>Sn magnets; PARTICLE ACCELERATORS; Stress; Superconducting magnets; Superconductivity; Superconductors
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2023.3250382

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.