| 摘要 |
A superconducting magnet assembly, or methods of filling a cryogen into the said assembly, comprises: a superconducting magnet structure 10 supported within a cryogenic vessel 12 with an access pipe 16 which extends from the exterior of the assembly to a lower region of the cryogen vessel where the end of the pipe 16 is at a desired maximum fill level 32 for the liquid cryogen when the magnet is in operation. The access pipe 16 may extend within the cryogen vessel 12. The assembly may have a horizontal bore 14a and the end 32 of the pipe may extend to a position below a lower extremity of the bore 14a of an outer vacuum container 14. The pipe 16 may be supported and retained in position by a turret 20 which includes a cryogenic refrigerator and sock 22. Cryogen venting may be provided which allows the cryogen level to be filled to a higher level than the maximum fill level set for normal operation. The methods of filling the assembly may include selecting a suitable vent level in the cryogen vessel at a desired cryogen level for transportation, ramping or normal operation, with no other vents above this level. The level of the turret position on the assembly may be adjusted. The assembly may be rotated to give different cryogen levels within the vessel 12. |
