Abstract
The Pulsed Field Magnetization (PFM) is a compact and fast method to magnetize superconducting bulks compared to quasi-static magnetization methods like field- or zero-field-cooling. However, the heat generation induced by the strong applied variable magnetic field during the PFM makes high trapped magnetic field harder to achieve. In order to make the REBaCuO bulks easier to magnetize by PFM, superconducting bulks including a superconducting weld are studied by considering the electromagnetic properties of the weld different from those of the bulk body. This artificial grain boundary obtained by superconducting welding method might increase the trapped magnetic flux without increasing the applied magnetic field. In this paper, we are modelling the superconducting weld behavior during PFM using a 3D finite element model with the software COMSOL Multiphysics. The simulations are based on an H-formulation from Maxwell’s equations and the heat diffusion equation. We analyse the impact of the critical current Jc of the weld on the trapped magnetic field.
Highlights
The superconducting welding process for REBaCuO bulks consist of the use of a superconducting solder material with a low peritectic temperature to make an artificial grain boundary between two single grain bulks
The pulsed field magnetization (PFM) appears to be a more compact way to magnetize superconducting bulk compared to quasi-static magnetization methods like field- or zero-field-cooling
In order to increase the trapped flux obtained by PFM, a superconducting weld placed at the middle of the bulk is considered with a critical current Jc weaker than the bulk body
Summary
The superconducting welding process for REBaCuO bulks consist of the use of a superconducting solder material with a low peritectic temperature to make an artificial grain boundary between two single grain bulks. The superconducting process is similar to the multi seeded melt growth technique (MSMG) as the two welded bulks acts as the seeds giving their crystal orientation to the weld material. This process and its crystallization is well known in the literature [12] and it has been shown that the grain connection of superconducting welds is better than MSMG [13]. In order to increase the trapped flux obtained by PFM, a superconducting weld placed at the middle of the bulk is considered with a critical current Jc weaker than the bulk body. We are simulating by Finite Element Method (FEM) the PFM of a superconducting bulk including a junction with different critical currents on a 3D model implemented on the software COMSOL Multiphysics
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
