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ABSTRACT: A 10 K refrigerator cooled superconducting magnet with an
open-ended, C-shaped iron core was developed and tested for the special
purpose of magnetic resonance imaging. The magnet employs a single Nb3Sn
tape superconducting coil and an open-ended iron loop. The
superconducting coil Is cooled and maintained at the 10 K operational
temperature by a Gifford-McMahon (G-M) cryocooler. The magnetic field in
the iron open gap is used for magnetic resonance imaging. The field
homogeneity is achieved by contoured iron pole faces and specially
developed passive shimming procedures. We have achieved less than 1
ppm/hour field stability and a 29 ppm field homogeneity over a 10 cm
diameter spherical volume. High quality images have been produced using
this magnet
IEEE Transactions on Magnetics 08/1996; · 1.36 Impact Factor
