Abstract
Several distinct types of cryocable have emerged from research in the US and in Europe. All rely on vacuum for thermal insulation from the environment. Some also depend on vacuum for thermal isolation of opposing coolant streams in the same cryogenic envelope to save the installation of an external vacuum insulated coolant return pipe. In one case it is proposed to use the same evacuated space for thermal insulation of the cable, thermal isolation of opposing coolant streams, and high voltage electrical insulation of the conductors. This greatly simplifies the construction of the cryocable and reduces its overall diameter. Practical experience with quite a few miles of rigid and semiflexible vacuum insulated cryogenic transfer lines is indicating that vacuum integrity can be maintained on long cryocable installations.
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