3D Modeling and Simulation of HTS Stacked Tapes Magnetic Lens Within Small HTS Coil

Magnetic lens, with its specific superconducting material structure, spatially concentrates magnetic flux, making it highly significant for the development of compact high-field systems. High-T_c superconducting bulk superconductors commonly used in magnetic lenses can trap high magnetic fields at low temperatures. However, a large Lorentz force developed during the magnetization process results in the formation and propagation of crack within bulk, eventually leading to mechanical failure. High-temperature superconducting tapes (HTS tapes) with excellent mechanical and flux pinning properties, have become the ideal material for magnetic lens. In this study, we designed and simulated magnetic lens using HTS stacked tapes with different shapes within a small coil to analyze the central magnetic flux density. This reflects the magnetic flux concentration in the central region. The results show that the stacked tapes with the specified dimensions can increase an external magnetic field of 16.80 T to 17.46 T. The finite element simulation model provides valuable references for the shape and size of the magnetic lens in compact small-scale magnets throughout the optimization design process.