Deformation Calculation and Optimal Design of the Compact Magnet for CYCIAE-100

The compact main magnet structure of CYCIAE-100, the 100 MeV high intensity cyclotron, causes the magnetic filed on the median plane to be highly sensitive to the deformation of the main magnet. The major factors that determine the structural deformation of the magnet are attributed to the mechanical properties of the pure iron, the magnet structure and the external force load. The work presented in this paper adopts the virtual work method and the Maxwell stress tensor method to precisely calculate the electromagnetic force exerted on the main magnet by the code developed by CIAE in combination with other existing codes, e.g., TOSCA and ANSYS. An in-depth analysis and comparison on the force are carried out. On that basis, five different solutions of the main magnet structure are put forward. Then numerical simulation of the magnetic field and the mechanical stress are conducted and the adoption of uneven-height top/bottom yokes is nailed down in the optimal design.