Speaker
Description
This work provides an overview of the experimental and numerical simulation studies on the effects of cool down and external magnetic field-induced mechanical damage in epoxy-impregnated REBCO magnets. Firstly, a circumferential stress numerical model for an epoxy-impregnated REBCO no-insulation (NI) insert magnet was established. The simulation encompasses the cooling process, the influence of the external magnetic field, and the coil charging up to the operating current. Secondly, we fabricated and tested an epoxy-impregnated REBCO NI insert magnet, comparing the numerical model results with the experimental data. The magnet consists of six stacked double pancake (DP) coils, with a winding inner diameter of 17 mm and an outer diameter of 23 mm. The epoxy-impregnated REBCO NI insert magnet was tested under conditions of 4.2 K and an external magnetic field intensity of 12 T. Finally, when the operating current reached 217 A, the central magnetic field strength reached 15 T, allowing stable operation. Epoxy resin impregnation effectively enhances the mechanical environment of superconducting coils. The effects of structural parameters of interpolated magnet, epoxy impregnation, low temperature cooling and external field strength on the mechanical damage of the coil were further studied. This work can serve as a reference for the design and analysis of high-field epoxy-impregnated HTS insert magnets.
