| 摘要 |
An apparatus for transferring liquid helium between axially spaced first and second endpieces, being fixed thereto at opposite ends and having an intermediate insulative portion. An outer conduit of larger diameter concentrically surrounds the internal cryogen delivery conduit and also extends between and is fixed at opposite ends to the two endpieces. The outer conduit has an insulative portion, with the insulative portions of the internal cryogen delivery conduit and the outer conduit electrically insulating the first endpiece from the second endpiece. An annular space between the internal cryogen delivery conduit and the coaxial outer conduit is subject to vacuum pressure via a pumping passage within one of the endpieces which connects to that annular space and which may be connected to a pump for providing the vacuum within that space. Fins are disposed about the periphery of the coaxial outer conduit. As a result, the second endpiece may be connected to a device at a second voltage significantly different from a first voltage connected to the first endpiece. |
