Japan International Superconductivity Technology Center

Tokyo, Japan

Japan International Superconductivity Technology Center

Tokyo, Japan
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Patent
Japan International Superconductivity Technology Center and Fujikura Ltd | Date: 2015-11-04

An RE123-based superconducting wire (10) of the invention includes: a substrate (11); an intermediate layer (12) provided above the substrate (11); and an oxide superconducting layer (14) that is provided above the intermediate layer (12) and is made of an oxide superconductor expressed by a composition formula of RE_(1)Ba_(2)Cu_(3)O_(7-) where RE represents one kind of or two or more kinds of rare earth elements in the formula, wherein an Hf-containing compound of 0.5 to 10 mol% is introduced into the oxide superconducting layer (14), a different phase containing Hf is dispersed in the oxide superconducting layer (14) as a flux pinning center, and the a-axial-ratio of the oxide superconducting layer (14) is less than or equal to 1.5%.


Patent
Japan International Superconductivity Technology Center, Fujikura Ltd, Swcc Showa Cable Systems Co. and Furukawa Electric Group | Date: 2016-04-13

An oxide superconductor includes: a substrate made of a metal; an insulating intermediate layer provided on the substrate; an oxide superconducting layer provided on the intermediate layer; a metal stabilizing layer provided on the oxide superconducting layer; and a plurality of dividing grooves which divide the metal stabilizing layer and the oxide superconducting layer along a longitudinal direction of the substrate, reach the inside of the intermediate layer through the oxide superconducting layer from the metal stabilizing layer, and do not reach the substrate. The metal stabilizing layer and the oxide superconducting layer are divided to form a plurality of filament conductors by the plurality of dividing grooves, and in each dividing groove of the plurality of dividing grooves, a width of a groove opening portion of the dividing groove is equal to or greater than a width of a groove bottom portion of the dividing groove.


Patent
Japan International Superconductivity Technology Center, Fujikura Ltd, Swcc Showa Cable Systems Co. and Furukawa Electric Group | Date: 2014-05-28

An oxide superconductor includes: a substrate made of a metal; an insulating intermediate layer provided on the substrate; an oxide superconducting layer provided on the intermediate layer; a metal stabilizing layer provided on the oxide superconducting layer; and a plurality of dividing grooves which divide the metal stabilizing layer and the oxide superconducting layer along a longitudinal direction of the substrate, reach the inside of the intermediate layer through the oxide superconducting layer from the metal stabilizing layer, and do not reach the substrate. The metal stabilizing layer and the oxide superconducting layer are divided to form a plurality of filament conductors by the plurality of dividing grooves, and in each dividing groove of the plurality of dividing grooves, a width of a groove opening portion of the dividing groove is equal to or greater than a width of a groove bottom portion of the dividing groove.


Patent
Japan International Superconductivity Technology Center and Fujikura Ltd | Date: 2014-05-07

An RE123-based superconducting wire includes a base material, an intermediate layer formed on the base material, and an oxide superconducting layer which is formed on the intermediate layer and includes an oxide superconductor having a composition formula represented by RE_(1)Ba_(2)Cu_(3)O_(7-) (RE represents one or two or more rare earth elements), in which the oxide superconducting layer includes 0.5 to 10 mol% of a Hf-including compound dispersed in the oxide superconducting layer as an artificial pinning center, a film thickness d of the oxide superconducting layer is d>1 m, and a current characteristic of J_(cd)/J_(cl)0.9 (J_(cl) represents a critical current density when the thickness of the oxide superconducting layer is 1 m, and J_(cd) represents the critical current density when the thickness of the oxide superconducting layer is d m) is satisfied.


A superconducting wire material connection structure is adopted in which a recessed portion formed by removing the superconducting layer (3) at the terminal (10a) of the superconducting wire material is filled with a filling material (9), and, in a section where the terminals (10a) of the first superconducting wire material (11) and the superconducting wire material (12) are arranged opposite of each other, a third superconducting wire material (13) spans and connects the first superconducting wire material (11) and the second superconducting wire material (12) along the longitudinal direction of the first superconducting wire material (11) and the second superconducting wire material (12). Thereby, it is possible to prevent peeling and damage of the superconducting layer (3) at the terminal (10a) of the superconducting wire material, and troublesome decreases in semiconductor performance in the connection portion of the superconductor wire material are avoided.


Patent
Furukawa Electric Group and Japan International Superconductivity Technology Center | Date: 2014-05-07

A connection structure for connecting hollow formers (140) provided inside a superconducting cable (10), wherein the connection structure is characterized in that one end section and another end section of a hollow connecting conduit (145) are inserted into an open section (144) leading to a hollow interior section formed in a connection end section of each of the formers, the opposed connection end sections of the formers being welded together. The connection conduit (145) thereby ensures circulation of a refrigerant. Also, there is no incidence of the cooling medium circulation path being blocked when welding is performed in the connection conduit, allowing formers to be more easily connected.


Patent
Furukawa Electric Group and Japan International Superconductivity Technology Center | Date: 2014-05-07

A connection structure for superconducting cables includes: superconducting cables that are connected to each other and include cable cores containing formers and superconducting conductor layers, and each cable core is housed in a thermal insulation tube with a cooling medium, wherein the cable cores include electric insulating layers obtained by winding insulating sheets around the superconducting conductor layers, the electric insulating layers on both sides of a conductor connecting part, in which the formers and the superconducting conductor layers are connected to each other, include taper shape portions each having a diameter reducing towards the conductor connecting part, each taper shape portion is formed so as to have an inclination angle changing in a stepwise fashion by a plurality of tapered portions among which a tapered portion nearer the conductor connecting part has smaller inclination angle, and a reinforcing insulating layer is provided between the taper shape portions.


Patent
Japan Oil, Gas, Metals National Corporation and Japan International Superconductivity Technology Center | Date: 2014-10-29

The invention relates to a liquid nitrogen cooling sensor device container and liquid nitrogen cooling sensor equipment, and effectively reduces low-frequency noise while maintaining the ease with which a probe can be inserted in and removed from liquid nitrogen. Said invention comprises: a liquid nitrogen containing insulating container that contains liquid nitrogen; a sensor fixing member which has a distal end portion to which a sensor operating at a temperature of the liquid nitrogen is attached; and a fixing buffer member which is for fixing the sensor fixing member to the liquid nitrogen containing insulating container, wherein the fixing buffer member exerts a buffering effect in the liquid nitrogen.


Patent
Japan International Superconductivity Technology Center and Swcc Showa Cable Systems Co. | Date: 2014-02-27

Provided is an oxide superconductor composition that makes it possible to increase film thickness, increase production speed, and decrease costs when producing a REBaCuO-type oxide superconductor wire (wherein RE is at least one element selected from the group consisting of Y, Nd, Sm, Gd, Dy, Eu, Er, Yb, Pr, and Ho). The oxide superconductor comprises, as essential components thereof, an RE salt of a carboxylic acid that serves as an RE component, that does not contain a ketone group, and that has 3-8 carbon atoms, barium trifluoroacetate that serves as a Ba component, one or more copper salts that serve as a Cu component and that are selected from the group consisting of copper salts of branched saturated aliphatic carboxylic acids having 6-16 carbon atoms and copper salts of alicyclic carboxylic acids having 6-16 carbon atoms, and an organic solvent that dissolves the aforementioned metal salt components.


Patent
Japan International Superconductivity Technology Center | Date: 2014-02-27

The present invention relates to a superconducting single flux quantum integrated circuit device, and eliminates the return current from a bias current and the effect the bias current itself has on SFQ logic circuits in a chip. A bias power source line for supplying a DC bias current for the superconducting single flux quantum integrated circuit in a chip and a bias drawing power source line for drawing said DC bias current to the outside of the chip are provided, the end of the bias drawing power source line is connected to the ground plane of the chip via a thin-film resistor having a plurality of resistance values of 0.1 milliohm to I milliohm near the superconducting single flux quantum integrated circuit laid out in the chip, and the DC bias current is drawn from a connection point with the ground plane.

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