AC Loss Investigation in MgB2 Multifilamentary Wires: A Numerical Study

The discovery of superconductivity in magnesium diboride (
$\text{Mg}\text{B}_{{\text{2}}}$
) in 2001 generated significant interest due to its relatively high critical temperature and cost-effectiveness. While
$\text{Mg}\text{B}_{{\text{2}}}$
has shown promise in direct current (DC) applications, its utilization in alternating current (AC) devices is hindered by dissipative phenomena. Consequently, research and development efforts have been devoted to understanding the factors influencing losses in
$\text{Mg}\text{B}_{{\text{2}}}$
conductors and exploring novel designs aimed at reducing AC losses. This study presents an efficient computational tool based on a three-dimensional integral formulation of Maxwell's equations, enabling the calculation of losses in multi-filamentary
$\text{Mg}\text{B}_{{\text{2}}}$
wires. By employing numerical simulations under various operating conditions and comparing the results with existing analytical formulæ, the study primarily focuses on simplified scenarios. Essential design criteria are identified, providing insights on how to effectively minimize coupling losses for specific operating conditions.