11:59 Jun 21, 2009 

This type of conductor comprises a multi-strand cable of superconducting wires within a tube-like conduit, with single-phase supercritical helium filling the cable voids within the conduit. With this geometry, all the helium in the system is contained within the conductor conduit, eliminating the need for a helium cryostat, and effectively mitigating many of the operational problems associated with the more common two-phase helium systems.

http://psfcwww2.psfc.mit.edu/technology_engineering/cicc.htm...