https://doi.org/10.1140/epjs/s11734-025-01494-2
Regular Article
Numerical simulation of HTS butterfly lens based on H-
formulation
1
Institute of Electrical Engineering, Chinese Academy of Sciences, 100190, Beijing, China
2
University of Chinese Academy of Sciences, 100049, Beijing, China
3
Department of Automation, University of Science and Technology of China, 230026, Hefei, Anhui, China
4
Ganiiang, Innovation Academy, Chinese Academy of Sciences, 341000, Ganzhou, Jiangxi, China
Received:
12
September
2024
Accepted:
26
January
2025
Published online:
14
February
2025
As a novel passive magnetic field focusing device, the high-temperature superconducting (HTS) magnetic lens has great promise for various applications due to its compact structure and low losses. However, there is still insufficient experience in the material selection basis and operation control law for the magnetic lens. In this paper, a 2D finite element simulation model based on H- formulation is innovatively constructed, and the feasibility of the 2D finite element simulation model is proved by comparing it with the 3D simulation model and combining it with the experimental data of Z Y Zhang. Under the premise of guaranteeing calculation accuracy, calculation time is greatly reduced, which provides a new computational model for exploring the operation control law of the magnetic lens. In this paper, we innovatively take the critical current density characteristics of HTS bulks as an entry point to investigate the numerical relationship between the magnetic convergence characterization, magnetic remanet characterization of the magnetic lens, and the critical current density of the materials under different background magnetic field amplitude conditions. The research results show that: under different background magnetic field amplitudes, the steady-state convergence ratio increases with the increase of critical current density; the steady-state residual magnetism ratio increases first and then decreases with the increase of critical current density, and there is an extreme value. Therefore, this paper proposes reference critical current density based on the performance of the magnetic lens on magnetic fields focusing under different operating states, which provides a reasonable reference basis for the selection of magnetic lens materials and strong support for the development of the magnetic lens.
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Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
