AC loss calculation for multi pancakes of (Re)BCO coated conductor using   line front
  We aim to demonstrate an efficient method to calculate the AC losses in multi-pancake coils. This method extends Yuan front-track model into several pancake application and investigates the detail parameters in comparison with established H-formula implemented in COMSOL and minimization of energy method. We use the front-track idea to analyze stacked pancakes assuming the current fronts are straight lines and using the critical state model. The current distribution is solved by two means: minimization of the perpendicular magnetic field in the subcritical region, as Clem and Yuan proposed; minimization of total magnetic energy. We also investigate the impacts of applied current and different gaps between multi pancakes on loss calculation. Our model provides a fast calculation method of AC loss in stacked (Re)BCO pancakes and is useful to HTS applications in high field magnets, energy storage devices and electric machines. 
Huiming Zhang, Min Zhang and Weijia Yuan
cond-mat.supr-con