Applications of superconducting permanent magnets driven by static and pulsed fields

摘要

By making full use of an excellent trapped fieldperformance of the c-axis oriented single-domain Ag-bearing5m123 superconductors with a diameter of 36 mm, we havedeveloped several superconducting permanent magnet systemsdriven by static and pulsed fields. The Sm123 superconductorcan trap a magnetic field of 2.1 at 77 K and can increase itsmaximum trapped field to 9 T at 25 K in the static field coolingmagnetization. A Nd-Fe-B plate (50 x 50 x 5 mm~3) can bemagnetized to the same level as that due to the uniform staticmagnetization by scanning it over the Sm123 superconductingpermanent magnet. The construction of a pulse field-drivenface-to-face-type magnetic field generator capable of producing1.8 T in an open space with a gap of 12 mm is also presented.We also suggest hollowed Sm123 superconductors to serve as apermanent magnet providing a uniform magnetic fieldexceeding 2 T over the range up to 10 mm.