Magnetic and mechanical analysis of Bi-2212 Rutherford cable in a cos-theta sub-scale dipole coil

• Published in: Superconductor science & technology Vol. 38; no. 3; pp. 35021 - 35028
• Main Authors: D’ Agliano, A, Zlobin, A V, Novitski, I, Turrioni, D, Barzi, E, Donati, S, Giusti, V
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.03.2025
• Subjects: Bi-2212; cosine-theta; finite-element analysis; Rutherford cable; superconducting accelerator magnet
• ISSN: 0953-2048; 1361-6668
• DOI: 10.1088/1361-6668/adb340

The U.S. Magnet Development Program (US-MDP) explores high-field accelerator magnets compatible with operational conditions beyond the limits of Nb 3 Sn technology. The ongoing R&D High-Temperature Superconductors (HTS) suggests using Bi 2 Sr 2 CaCu 2 O 8 − x (Bi-2212) as superconducting element. Bi-2212 Rutherford cables maintain a high critical current ( I C ) when exposed to a large external magnetic field. However, Bi-2212 exhibits an oversensitive stress–strain response when subject to large Lorentz forces. This paper reports on the magnetic and mechanical analysis of the Bi-2212 cosine-theta insert being developed at Fermilab for a hybrid magnet composed of two external layers of Nb 3 Sn and two internal layers of Bi-2212. We performed a FEM analysis of the insert to estimate the HTS stress state in the coil’s strands under magnetic and mechanical loads.