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2D and 3D FEM Modelling of high torque CCT magnet structures
Description
Recently, a revival of Canted Cosine Theta (CCT) magnet designs have resulted in several accelerator type magnets being developed. With the CCT design promising low-cost with good field quality for the accelerator type magnets, an in-depth understanding of the internal stresses is needed. The complexity of calculating the coil internal behaviour during assembly, cool down, and powering are a significant new challenge to magnet designers. The subject of this paper covers a new FEA approach and studies a multilayer CCT magnet design that incorporates large and complex internal forces. This approach could be used for any of the CCT magnets currently in progress for: proton therapy, nested coils, septum magnets, down to simple dipole, quadrupole and sextuple plus many more designs.
A full parametric 3D model of a 4-layer CCT magnet was developed using the APDL scripting in the ANSYS software. A 2D model was developed to check the possibility of describing the behaviour of the straight section of the magnet with reasonable agreement w.r.t. the 3D model. This 2D model has a potential for further developments to include the strands and even the filaments, which will be the subject of future work.
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