Abstract: A power lead for a cryostat has high temperature superconducting (HTSC) conductors extending inward toward a pool of liquid cryogen in the cryostat in series with normal conductors extending from the HTSC conductors to outside the cryostat. Tubular shrouds vented to atmosphere direct a flow of cryogen vapor along the HTSC conductors to maintain them superconducting, and along the normal conductors to remove Joule heat and heat leakage along the normal conductors. In one embodiment, a pool of liquid nitrogen maintained within a tubular inner shroud is the principal coolant for the normal conductors. Helium vapor is circulated over the HTSC conductors and is then directed by an outer tubular shroud around the inner tubular shroud to provide additional cooling for the normal conductors. Flexible connectors at one end of each of the HTSC conductors accommodate for individual thermal contractions of these conductors.

Abstract: An apparatus for holding a superconducting cable comprising a support structure having grooves and a slot that receives the cable. The apparatus is also comprised of at least one cable retaining clip. The clip is fitted into the grooves and held thereby such that the clip retains the cable in the slot and in contact with the support structure. In a preferred embodiment, the clip and the support structure are made out of different materials with the clip made of a material that has a lower coefficient of thermal expansion that the material of which the support structure is made.

Abstract: In an installation including a superconducting solenoid coil in the form of an annulus having a vertical axis, a first vessel having an annular form and enclosing the coil for containing a primary cryogen at a temperature sufficient to maintain the coil superconductive, and at least one second vessel having an annular form and enclosing the first vessel for containing a secondary cryogen at a selected temperature, there are provided: cryogen storage containers spaced horizontally from the coil and the vessels for receiving the cryogens contained in the vessels; and conduit systems coupled between the vessels and the storage containers for permitting the flow of cryogens therebetween.

Abstract: In a superconducting solenoid disposed in a cryogenic bath, the solenoid being in the form of a cylindrical annulus having a vertical axis and being composed of: two conductors (2,4) each containing superconductive material and each wound into a single layer helical coil; first and second support units (6) each supporting a respective conductor (2,4); and insulation members (8,12,14) composed of horizontal insulating layers (12) interposed between successive turns of each of the conductors (2,4), and vertical insulating layers (10) interposed between the first support unit (6) and the second support unit (6), the insulation members (8,12,14) being constructed such that variations in the current flowing through the conductors (2,4) produce varying magnetic fields which cause the insulation members (8,12,14) to experience heat-generating frictional movements, the support units (6) and the insulation members (8,12,14) are provided with a network of interconnected flow channels (22,24,26) communicating with the b