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arXiv · 2605.16659

Non-linear diffusion and inhomogeneity of the magnetic field in single-turn coils: Insights from 3D multiphysics modeling

Hideaki Kobayashi·Yugaku Goyo·Yuto Ishii·Yasuhiro H. Matsuda·Kunio Takekoshi·Akihiko Ikeda
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Abstract

The single-turn coil method is a destructive pulsed magnet for generating over 100 T with a few $μ$-second pulse duration, and it inevitably causes the coil to explode. The temporal and spatial distributions of the electric current and magnetic field are highly inhomogeneous, arising from the skin effect, rapid temperature rise, and coil deformation. To grasp the dynamic phenomena in the single-turn coil, we conducted a finite element analysis using multiphysics simulation. We employed finite element method calculations using a fully 3D model of the single-turn coil with broken cylindrical symmetry. The calculated result revealed highly nonlinear diffusion of electric current, temperature, and magnetic fields, which are the sources of the inhomogeneous magnetic fields inside the single-turn coil in time and space.

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Hideaki Kobayashi, Yugaku Goyo, Yuto Ishii, Yasuhiro H. Matsuda, Kunio Takekoshi, Akihiko Ikeda. 2026-05-15. Non-linear diffusion and inhomogeneity of the magnetic field in single-turn coils: Insights from 3D multiphysics modeling. https://arxiv.org/abs/2605.16659

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