Magnetic field generating assembly

摘要

A magnetic field generating assembly comprises a superconducting magnet (6) located in a cryostat (1) and defining a bore (7) accessible from outside the cryostat. A mechanical refrigerator (10) having at least two cooling stages (11-13) is provided for at least partly cooling the cryostat (1). A coolant path extends from the refrigerator (10) into the magnet bore (7), the coolant path being coupled for heat exchange with a cooling stage (11) of the refrigerator (1) other than the coldest cooling stage so that the refrigerator is adapted also to cool coolant in the coolant path. <IMAGE>