AC loss of second-generation high-temperature superconducting pancake coils

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Date/Time:Thursday, 09 Sep 2010 from 4:10 pm to 5:00 pm
Location:RM 5 Physics
Phone:515-294-5630
Channel:Condensed Matter Physics
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Dr. Weijia Yuan
Electronic, Power and Energy Conversion Group, Engineering Department, University of Cambridge

Second-generation high-temperature superconducting pancake coils can be used in a range of large scale applications - for example, Superconducting Magnetic Energy Storage (SMES), Superconducting Fault Current Limiter (SFCL), MRI, and so on. Therefore predicting AC losses and critical currents are very important for the applications of superconducting coils.

Based on Clem's original anisotropic homogeneous medium approximation model the pancake coils, a new model taking into account both Jc dependency on B and different penetration depths in different tapes was developed. Compared to the method using commercial FEM software, this numerical method is able to calculate AC losses much faster. In addition, an experimental rig was set up to validate the computation model.