Two-dimensional mechanical analysis of superconducting double-aperture quadrupole magnet prototype for CEPC

Introduction The circular electron-positron collider(CEPC)with a circumference about 100 km,a beam energy up to 120 GeV is proposed by the Institute of High Energy Physics.The heart of the CEPC is a double-ring collider with two interaction points.In each side of the collision point,superconducting double-aperture quadrupole magnets based on cos2θdesign which is named QD0 and QF1 separately are required.Such kind of superconducting magnet is designed first time in domestic.Mechanical stability analysis is very important for superconducting magnet before manufacture.This paper mainly focused on the mechanical analysis of the prototype for QD0.Materials and methods A 2D 2-layers model was developed using ANSYS to simulate the stress distribution in the coil from collaring process at room temperature to low temperature excitation.Conclusion As part of the CEPC project,a 40 mm bore diameter superconducting double-aperture quadrupole magnet named QD0 is being designed and the physical calculation has been completed.This paper introduces the mechanical design,simulation model of prototype for QD0,and mainly expounds on stress analysis.The stress distribution during 4 stages including collaring(load application),collaring(inserting keys),cooling down and excitation is described in detail.