Structural Analysis of an 18 T Hybrid Canted–Cosine–Theta Superconducting Dipole

Abstract

The canted–cosine–theta (CCT) is an advantageous design for high-field superconducting dipoles because of its modular construction and significant reduction in Lorentz-force-induced conductor stress. This is accomplished by introducing layered structural elements within the coilpack to both position the conductor and prevent the accumulation of Lorentz forces. This paper presents 3-D structural analysis of a CCT dipole consisting of four inner layers of Bi2212 high-temperature superconductor (HTS) and eight outer layers of $\hbox{Nb}_{3}\hbox{Sn}$ . Finite-element calculations in ANSYS are shown for configurations with and without the HTS insert. The effectiveness of using mandrels as an internal structure is demonstrated by local conductor stress components of less than 75 MPa in Bi2212 and less than 100 MPa in $\hbox{Nb}_{3}\hbox{Sn}$ with minimal structure external to the coilpack.