Abstract
Second generation (2G) high-temperature superconductor (HTS) (RE)Ba2Cu3Ox (REBCO) shows a great potential in building high field magnets beyond 23.5 T. The electromagnetic modelling is vital for the design of HTS magnet, however, this always suffers the challenge of huge computation for high field magnets with large number of turns. This study presents a novel electromagnetic modelling based on T-A formulation for REBCO magnets with thousands of turns. An equivalent turn method is proposed to reduce the number of turns in calculation, so that the computation cost can be reduced significantly, and meanwhile the key electromagnetic behaviour of HTS magnet can be simulated with enough accuracy. The ramping operation of a fully HTS magnet with 12,000 turns are analysed using both the original T-A model with actual turns and improved T-A model with equivalent turns. The two models show a good agreement on the key electromagnetic behaviours of the magnet: distribution of current density, magnetic fields, screen current induced field and magnetisation loss, so that this improved T-A model using equivalent turns is validated. The T-A modelling of REBCO magnet is a powerful tool for the electromagnetic analysis of industry-scale high field magnets.
Highlights
Superconducting high field magnet plays an important role in scientific instruments, accelerator magnets, nuclear magnetic resonances and energy storage, which always prefer higher magnetic fields [1,2,3,4]
Same ramping operation is simulated by both original T-A model with actual turns and improved T-A model with equivalent turns
This is led by position difference between actual turns and equivalent turns, which induces a slight difference on the distribution of magnetic fields
Summary
Superconducting high field magnet plays an important role in scientific instruments, accelerator magnets, nuclear magnetic resonances and energy storage, which always prefer higher magnetic fields [1,2,3,4]. This paper presents an improved T-A model for REBCO high field magnets with large number of turns, which can significantly reduce computation cost, and make the electromagnetic simulation of high field magnets fast, easy and practical. This model is partly inspired by the conventional homogenous Hformulation model, and some techniques and fundamentals of homogenous H-formulation are introduced. To validate this model, case comparisons are conducted on a 15 T REBCO magnet with more than 10,000 turns, and key electromagnetic characteristics of these high field magnets are analysed
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