Modeling Study and Comparison of Hybrid MgB₂—Ferromagnetic Shielding Designs

Superconducting materials find valuable application in the fabrication of magnetic shields [1]. In this regard, MgB₂ has been proved to be a very promising option [2]. Moreover, it has been shown how suitable simulation tools guiding the optimization process can be a successful approach to produce devices with high shielding ability [3].<br/>This work focuses on the exploitation of a 3D modeling procedure based on a vector potential formulation [4] implemented by means of the finite-element software COMSOL Multiphysics® [5]. By this approach, we calculated the shielding properties of tube- and cup-shaped MgB₂ samples with a height/diameter aspect ratio close to unity.<br/>The shielding efficiency of these layouts was analysed in both the axial-field (AF) and the transverse-field (TF) orientations, studying the effect of superimposing ferromagnetic vessels of different sizes around the superconductor [3, 6]. Then, focusing on the most efficient hybrid arrangements, we investigated their shielding performances for different angles of the applied magnetic field and compared the results obtained on the hybrid layouts with the corresponding superconducting configuration.<br/>Finally, a multiphysics analysis is presented as a preliminary modelling approach to predict the flux jumps phenomena that were observed during the experimental measurements [7].<br/><b>References</b><br/>[1] K.Hogan et al., Supercond. Sci. Technol., 31, 015001 (2018).<br/>[2] D.Barna et al., IEEE Trans. Appl. Supercond., 29, 4101310 (2019).<br/>[3] COMSOL Multiphysics®5.4 software (http://www.comsol.com).<br/>[4] L. Gozzelino, M. Fracasso et al., Supercond. Sci. Technol. Accepted (2021).<br/>[5] L. Gozzelino et al., Supercond. Sci. Technol., 33, 044018 (2020).<br/>[6] L. Gozzelino, M. Fracasso et al., Supercond. Sci. Technol. Accepted (2021).<br/>[7] L. Gozzelino et al., Supercond. Sci. Technol., 33, 044018 (2020).