Abstract: A superconducting cable joint structure is a structure used to joint together superconducting cables used at cryogenic temperature or to joint together a terminal of the superconducting cable and a normal conducting cable, and it includes a joint insulation layer arranged radially outer than a portion connecting the superconducting cables' respective conductors together or the superconducting cable's conductor and the normal conducting cable's conductor together, and at least one coolant path provided at the joint insulation layer to cool the portion connecting the conductors together. The cable cores can have their connection prevented from generating heat to have an increased temperature.

Abstract: A joint structure of a superconducting cable having improved connection strength and preventing break of a superconducting layer is provided. A central conductor of an insulating spacer and a superconducting cable are connected via a conductor connecting member having a sleeve-shaped end. Specifically, the central conductor of the insulating spacer and the conductor connecting member are connected by multi-contact connection.

Abstract: A first flange and a second flange are superposed and fastened with a bolt and a nut in a fastening operation, to implement a fastening structure used at temperature lower than atmospheric temperature for the fastening operation. Assuming that the first flange has a thickness L1 and a coefficient of linear expansion &agr;1, the second flange has a thickness L2 and a coefficient of linear expansion &agr;2, superposed first flange and second flange have a thickness L, and the bolt has a coefficient of linear expansion &agr;, a relation of L·&agr;≧L1·&agr;1+L2·&agr;2 is satisfied, i.e. heat shrinkage of the bolt is not smaller than the total heat shrinkage of the first and second flanges. Thus, impairment of sealing property due to heat shrinkage is avoided at a flange junction used at low temperature.

Abstract: A phase split structure of a superconducting cable includes three cable cores each having a shield layer provided around a superconductor, a splitter box housing the three cable cores extending from an assembly portion where the three cable cores are assembled into the cable, in a state in which the cable cores are spaced apart from each other, and a shield connecting portion connecting respective shield layers of the cable cores to each other within the splitter box. The shield connecting portion allows the cable cores to have their respective shield layers connected together with low resistance and each shield layer can pass a current substantially equal in magnitude to that which each superconductor passes. Thus in each shield layer a magnetic field can be formed having a level that can cancel a magnetic field generated from each superconductor. The structure can thus effectively prevent a large magnetic field external to the cable core.

Abstract: A termination structure of a cryogenic cable has a cryogenic-cable end portion and a current-lead end portion that are coupled to each other with a flexible conductor. Accordingly, any displacement in three-dimensional directions of the end portions that could occur due to thermal expansion and thermal contraction of the cryogenic cable and the current lead can be absorbed, and a sufficient current capacity can be ensured.

Abstract: A baking method for heating an object (an inner pipe, an outer pipe) having a vacuum layer formed therein to remove gas molecules occluded in the object, wherein the object itself is made to be a heat production element for heating. By making the baking object a heat production element, the object can be heated directly and the heating can be energy-efficient. Moreover, additional heating means such as a heater or gas is unnecessary, which enables simplification of a configuration of a baking device. Therefore, a baking method is obtained which enables energy-efficient heating and, in particular, uniform heating of a long or large object.

Abstract: A phase separation jig (100) for a superconducting cable includes: a cable holder (10) maintaining each core (80) of a multi-core superconducting cable (2) in a predetermined tolerable bending manner; and a coupler (20, 30) holding the cable holder (10) for each core (80) at a predetermined spacing with each other. Each core (80) is spaced apart from each other and maintained in a tolerable bending manner by the holder (10). Accordingly, a phase separation structure can be obtained which can regulate deformation of the cable and prevent abnormal deformation even for a superconducting cable.

Abstract: A superconducting cable is manufactured by providing spacers 12 in a plurality of cores 2 at the time of stranding of the cores 2, and removing the spacers 12 before the stranded cores 2 are housed in a thermally insulated pipe and housing the cores into the thermally insulated pipe while the strands are held in a slacked state. By means of temporal interposition of the spacers, there is easily manufactured three cores having sufficient slack to manage thermal contraction which occurs when the cores are cooled in the thermally insulated pipe.

Abstract: A terminal structure of cryogenic equipment for leading a terminal of cryogenic equipment 100 from a very low temperature portion to a room temperature portion through a bushing, having a feature in that a connecting/heat-insulating portion 300 adiabatically connected with the aforementioned very low temperature portion 200 and the aforementioned room temperature portion 400 is provided along the outer circumference of the aforementioned bushing 30 between the aforementioned very low temperature portion 200 and the aforementioned room temperature portion 400.

Abstract: A superconducting cable includes a core material, conductor layers formed by means of helically winding superconducting wires around the core material, electrically insulating layers, and magnetic shielding layers formed by means of helically winding superconducting wires around each of the electrically shielding layers. The superconducting wire is wound at the shortest pitch on the outermost conductor layer and is wound at the longest pitch on the outermost magnetic shielding layer.

Abstract: A superconducting cable is manufactured by providing spacers 12 in a plurality of cores 2 at the time of stranding of the cores 2, and removing the spacers 12 before the stranded cores 2 are housed in a thermally insulated pipe and housing the cores into the thermally insulated pipe while the strands are held in a slacked state. By means of temporal interposition of the spacers, there is easily manufactured three cores having sufficient slack to manage thermal contraction which occurs when the cores are cooled in the thermally insulated pipe.

Abstract: A superconducting cable includes a core material, conductor layers formed by means of helically winding superconducting wires around the core material, electrically insulating layers, and magnetic shielding layers formed by means of helically winding superconducting wires around each of the electrically shielding layers. The superconducting wire is wound at the shortest pitch on the outermost conductor layer and is wound at the longest pitch on the outermost magnetic shielding layer.

Abstract: An oxide superconducting stranded wire having inter-strand insulation and high critical current is provided. A wire including an oxide superconducting material and a matrix covering the material and consisting essentially of silver or a silver alloy is coated with a paint containing, as a main component, an organometallic polymer such as a silicone polymer or aluminum primary phosphorus in a paint reservoir, and the paint is baked in a baking furnace via a drying furnace. A plurality of such wires with the baked paint are twined into a stranded wire, which is then heated up to a temperature necessary for sintering the oxide superconducting material. The stranded wire thus obtained through the step of sintering may have high critical current. A heat-resisting insulating coating layer may be formed by baking the paint.

Abstract: Disclosed is an AC oxide superconductor round wire including a metal matrix, and a plurality of superconductor filaments embedded in the metal matrix, wherein the superconductor filaments are twisted at a twist pitch L.sub.p satisfying the following relation.2L.sub.c1 <L.sub.p .ltoreq.2L.sub.c2L.sub.c1 =2{(2.rho..multidot.d.sub.f .multidot.J.sub.c)/(.mu..sub.o .multidot.dH/dt)}.sup.1/2L.sub.c2 =2{(2.rho..multidot.d.sub.b .multidot.J.sub.cb)/(.mu..sub.o .multidot.dH/dt)}.sup.