Stress Analysis of 13 T Split Superconducting Magnet for Neutron Scattering

The stress and strain analysis is indispensable for the design and development of high field superconducting magnet. In this paper, a stress analysis with elastic and plastic theory for high magnetic field split superconducting magnet was introduced. By the stress analysis theory, the stress of 13 T split superconducting magnet for neutron scattering was simulated and discussed. Based on the analysis results, the structure of coils was modified by three ways including reduce the maximum magnetic field, applied pre-stress and increased thermal stress. After modified, the peak stress is 165 MPa appeared on the third Nb3Sn coils when the magnet is charged to operating current of 114 A. The peak value of radial stress on superconducting coils is 11.4 MPa appeared on the inner Nb3Sn coils reduced from 21.3 MPa. The stress along axis on the coils is less than 80.7 MPa reduced from 90.6 MPa. The hoop stress on the superconducting coils is 154 MPa which effected on the inner side of the third Nb3Sn coils reduced from 171 MPa. The developing risk of 13 T split superconducting magnet for neutron scattering is reduced significantly.