초록 ▼

A cryostat which is particularly useful for containing superconducting windings for a magnet to provide high strength magnetic fields for NMR imaging comprises a set of nested annular vessels in a suspension system which permits transport of the cryostat and magnet assembly with vacuum conditions in

A cryostat which is particularly useful for containing superconducting windings for a magnet to provide high strength magnetic fields for NMR imaging comprises a set of nested annular vessels in a suspension system which permits transport of the cryostat and magnet assembly with vacuum conditions intact. In particular, sets of transverse ties linking certain vessels to the next adjacent outer vessel are employed to prevent transverse motion of the cryostat assembly. Furthermore, during transport, a system of pins is employed to prevent axial motion, while at the same time minimizing thermal conductivity. During transport, the inner annular assemblies are locked in a fixed axial position which permits transport of the cryostat in a vertical position. A system of the present invention is therefore seen to satisfy the competing requirements for a strong internal support system for transport, but yet at the same time provides a suspension system which does not significantly impair the thermal insulation requirements of good cryostat design.

대표청구항 ▼

A cryostat comprising: a substantially rigid outer, evacuable vessel having an annular shape; a substantially rigid interior vessel having an annular shape and being wholly contained within said outer vessel so that the central axis of said interior vessel and said outer vessel lie substantially alo

A cryostat comprising: a substantially rigid outer, evacuable vessel having an annular shape; a substantially rigid interior vessel having an annular shape and being wholly contained within said outer vessel so that the central axis of said interior vessel and said outer vessel lie substantially along the same line; a first set of at least three supporting ties extending transversely from attachment positions on a first end of said interior vessel to said corresponding attachment points on the proximal end of said outer vessel, said attachment points on said first end of said interior vessel being substantially uniformly disposed about the periphery thereof and said corresponding attachment points on said outer vessel being substantially uniformly disposed about said outer vessel; and a second set of at least three supporting ties extending transversely from attachment points on a second end of said interior vessel to corresponding attachment points on the proximal end of said outer vessel, said attachment points on said second end of said interior vessel being substantially uniformly disposed about the periphery thereof and said corresponding attachment points on said outer vessel being substantially uniformly disposed about said outer vessel; said first set of ties being disposed so as to inhibit relative rotation of said outer and said interior vessels in a first rotational direction and said second set of ties being disposed so as to inhibit relative rotation of said vessels in the opposite rotational direction.