wherein said magnetic circuit comprises {HEAD ~ a magnetic field induction circuit} formed as {TAIL ~ a thin film} of the same superconducting material that is contained within said gap 
formed as
wherein said magnetic circuit comprises { HEAD ~ a magnetic field induction circuit } formed as { TAIL ~ a thin film } of the same superconducting material that is contained within said gap
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH