Speaker
Description
Accurately modeling the transient behavior of non-insulated (NI) ReBCO superconducting coils is crucial for fully assessing their potential for high-field magnet applications. 3D Finite Element (FE) models are among the most promising approaches for capturing the thermal-electrodynamics of these coils. However, most popular mathematical formulations of Maxwell’s equations for superconductors, such as the well-known H-φ formulation, are currently too computationally expensive to simulate large-scale systems like accelerator magnets.
To address this challenge, we present a novel mathematical formulation that couples a 3D FE magnetic module with a 1D FE + 2D Finite Difference (FD) electric module, implemented in COMSOL Multiphysics. The formulation has been used to develop a model that simulates the electrodynamics of large ReBCO NI pancake coils. Although still under development, the model has been validated against other models across various test cases, and preliminary results demonstrate its ability to efficiently capture critical phenomena such as persistent current effects while significantly reducing the computational time required for large-scale 3D FE transient simulations.
The formulation has then been applied to simulate the energization of the Muon Collider 40 T Solenoid, offering valuable insights into: (1) the relationship between energization time and turn-to-turn contact resistance, and (2) the impact of magnetization on the Lorentz forces acting on the conductor. These results highlight the potential of this 3D magnetic and electric coupling approach to advance the understanding of NI superconducting coils.
The incorporation of thermal behaviour into this model is currently underway to investigate quench phenomena and evaluate advanced protection strategies.
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