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