Speaker
Description
To achieve the realization of a 10 TeV Muon Collider facility and reduce the ring dimension to minimize muon decay, the main bending dipole magnets must generate high magnetic fields up to 16 T. Additionally, the superconducting coil aperture must accommodate thick tungsten shielding to protect the magnet from muon decay products. These challenging requirements motivate the investigation of high temperature superconductor (HTS) technology as a possible solution for the coil structure, exploring operating temperatures above liquid helium to potentially reduce the cost of cryogenics.
However, a large magnetization effect is induced by the persistent currents flowing along the wide HTS REBCO tapes to screen the external field. This phenomenon produces non-negligible effects, such as field quality degradation, hysteretic losses, and additional mechanical stresses on the conductor. Simulating these screening currents is essential but computationally expensive when performed numerically by Finite Element Method (FEM) software, significantly slowing down the iterative optimization process of magnet design.
For this reason, an analytical routine based on the Brandt model, capable of rapidly simulating the non-uniform current distribution, has been developed in MATLAB and validated by comparison with the numerical T-A formulation implemented in COMSOL Multiphysics.
The analytical model is proposed as a complementary tool to expedite the initial geometry optimization, rather than as a replacement for numerical solvers, which remain essential for performing detailed analyses.
This contribution presents the conceptual electromagnetic and mechanical design of the cos-theta dipole for the Muon Collider ring, where analytical and numerical methods have been employed synergistically to leverage the strengths of both design approaches.
