Magnetization of 2-G Coils and Artificial Bulks

The use of (Re) BCO is limited by the problems of magnetization/demagnetization. (Re) BCO is available in many forms, but two of the most interesting for high magnetic field applications are 2-G tape and bulks (either or as grown or manufactured artificially using 2-G tapes). The minimum joint resistance that can be achieved between YBCO tapes is on the order of 100 n Omega, but this is still too large to operate coils in persistent mode. Bulks have potential to act as very high field magnets, but in order to do this, they need to be magnetized. This paper describes flux pumping methods, which can be used to charge either coils or bulks.