Title :
Conductively cooled Nb3Sn magnet system for a magnetic refrigerator
Author :
Rowe, J.R. ; Hertel, J.A. ; Barclay, J.A. ; Cross, C.R. ; Trueblood, J.R. ; Hill, D.D.
Author_Institution :
Astronaut. Technol. Center, Madison, WI, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
A Nb3Sn magnet system for use in a magnetic refrigerator has been developed and tested. The system incorporates four asymmetric windings arranged as two Helmholtz pairs to produce two profiled field regions, required for a Carnot cycle. System components are cooled by conductive heat transfer to enable eventual operation in vacuum without liquid helium. Design features include low-resistance joints and superconducting interconnecting buses for low-ohmic losses in the persistent mode. The magnets are produced by the wind-and-react method on iron forms, followed by epoxy impregnation. The system requirements and design are described in further detail, and test results are presented
Keywords :
magnetic cooling; niobium alloys; refrigeration; superconducting magnets; tin alloys; type II superconductors; Carnot cycle; Helmholtz pairs; Nb3Sn magnet system; asymmetric windings; conductive heat transfer; conductively cooled magnet; epoxy impregnation; iron forms; low-ohmic losses; low-resistance joints; magnetic refrigerator; persistent mode; profiled field regions; superconducting interconnecting buses; vacuum; Cooling; Helium; Lead; Magnetic flux; Magnetic separation; Niobium; Refrigeration; Superconducting magnets; Temperature; Tin;
Journal_Title :
Magnetics, IEEE Transactions on
