| 摘要 |
A cylindrical superconducting magnet with inner 10 and outer 12 shield coils is housed within a cylindrical outer vacuum container 14. A thermosyphon cooling arrangement, with cryogen tank 22 smaller than the coils, is positioned within the vacuum container 14, reducing the height of the superconducting magnet. A heat exchanger 32, optionally in a recondensing chamber 40, is exposed to the interior of tank 22, and cooled by a cryogenic refrigerator 30. A thermosyphon tube 44 extends around, and in thermal contact with, outer coil 12 and has a bore connected to tank 22 above maximum cryogen level 28 and below minimum cryogen level 26. A portion of the outer coil is not in thermal contact with the thermosyphon tube containing liquid cryogen. Thermally conductive material 50 may be applied over this portion. Multiple thermosyphon tubes may be used with outer and inner coils, connected to tank 22 through manifolds. |
