Modeling and analysis of 5 T superconducting magnet during winding,cooling and excitation
Superconducting solenoids can produce steady and uniform magnetic fields and then combination of several sole-noids can achieve the desired large area,high field strength,and high uniformity of the magnetic field.The split magnet in the study is made up of a coil assembly nested from two groups of solenoids.The winding,cooling and excitation processes of the coil assembly were modeled and calculated,the mechanical behavior of the coil assembly under different loads was analyzed.The out-comes indicate that the hoop stress is significantly greater than radial stress of coils set because of pre-tension,and the coils ex-trusion cause a small deformation of the"Semi-I"skeleton.The magnetic induction intensity at the center of the coil assembly reaches 5 T with good uniformity after excitation,and the coil sets are mainly affected by the axial component of electromagnetic force which causes a tendency to deform close to each other.Besides,nice stability of the magnet structure is shown by the de-formations and strains caused by cooling and electromagnetic forces in the coil assembly,which do not surpass the load-bearing limit and do not significantly affect its electromagnetic performance.The results give valuable guidance for the manufacturing of the split magnet,and offer a path for the future investigation and construction of more intricate superconducting magnets.
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