Refrigerator Interface for Cryostat

Abstract

A substantially cylindrical cryostat defining an axial imaging region, the cryostat housing a magnet which, in use, provides a substantially homogeneous magnetic field in the imaging region, further comprising a refrigerator arranged to cool certain elements of the cryostat, said refrigerator comprising a magnetic material which, in use, oscillates along an axis of the refrigerator. The cryostat is arranged such that the axis of the refrigerator is substantially tangential to a circle centred on the axis of the cylindrical cryostat.

1 . A substantially cylindrical cryostat defining an axial imaging regions the cryostat housing a magnet which, in use, provides a substantially homogeneous magnetic field in the imaging region,
 further comprising a refrigerator arranged to cool certain elements of the cryostat, said refrigerator comprising a magnetic material which, in use, oscillates along an axis of the refrigerator, wherein   the axis of the refrigerator is substantially tangential, within the length of the refrigerator, to a circle perpendicular to, and centred on, the axis of the cylindrical cryostat,   characterised in that the circle is located approximately midway along the axis of the cylindrical cryostat, and the refrigerator is placed at the side of the cryostat.   
     
     
         2 . A cryostat according to  claim 1  wherein the axis of the refrigerator is substantially in the plane of the circle. 
     
     
         3 . A cryostat according to  claim 1 , wherein the axis of the refrigerator is within 20° of vertical. 
     
     
         4 . A cryostat according to  claim 3  wherein the axis of the refrigerator is substantially vertical. 
     
     
         5 . (canceled)