Abstract
A compact, cryogen-free 0.8T superconducting MRI magnet has been woundusing Nb 3Sn tape conductor and is maintained at 8K using a two-stage Gifford-McMahon refrigerator. The magnet is housed in a low eddy-current cryostat which incorporates a fiberglass-reinforced epoxy (FRE) vacuum enclosure with an integral stainless-steel permeation barrier, a composite copper/fiberglass thermal shield heat stationed to the first stage of the cryocooler, and a FRE magnet support structure heat stationed to the second stage of the cryocooler. The low eddy-current components eliminate the need to shield the gradient coils. The magnet components and the measured performance characteristics of the system are described in detail.
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