Some Consequences of Screening Currents in Solenoids Constructed from REBCO Double-Pancakes

It is well known that screening currents are induced in high temperature superconducting (HTS) tapes when they are located in a magnetic field that is changing with time. In recent years the consequences of these screening currents have become better understood in the context of solenoids built from REBCO double pancakes; specifically, the impact that can occur to the magnetic field distribution and the stress distribution. Pursuing this line of research further, a revisit of the 32 T prototype magnet in terms of order of energizing to the quench event has been investigated. A theoretical method and a finite element simulation have also been performed to study the stress/strain distribution, enthalpy margin, and AC losses affecting the quench of the superconducting solenoids. The analytical derivations of the hoop strain presented in this paper are based solely on screening currents, excluding the general radial expansion caused by the transport currents.