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Patent
Kobe Steel and Japan Superconductor Technology Inc. | Date: 2016-03-04

Liquefier includes first compression section which is driven by a superconducting motor and which compresses a substance in a gaseous state. Cooling circuit includes: second compression section which is driven by the motor when first compression section is being driven by the motor and which compresses a refrigerant; first heat exchange section which cools the refrigerant by causing heat exchange between a substance in a tank and the compressed refrigerant; second expansion section which brings the refrigerant down to or below a critical temperature of a superconducting material by expanding the cooled refrigerant; and second heat exchange section which imparts cold heat of the refrigerant to the substance by causing heat exchange between the substance in the tank and the refrigerant after cooling a superconducting magnet, and supplies the refrigerant brought down to or below the critical temperature by second expansion section to the motor and cools the superconducting magnet.


Patent
Kobe Steel and Japan Superconductor Technology Inc. | Date: 2016-06-21

Provided is a multilayer magnetic shield 21 formed of magnetic materials and disposed on the outer side of a superconducting magnet 11, the multilayer magnetic shield 21 including a first magnetic shield 1 disposed on the outer side of the superconducting magnet 11 and a second magnetic shield 2 disposed on the outer side of the first magnetic shield 1. The first magnetic shield 1 includes a first cylinder section 1a enclosing the superconducting magnet 11 and a pair of first flange sections 1b connected to the first cylinder section 1a. The second magnetic shield 2 includes a second cylinder section 2a enclosing the first cylinder section 1a and a pair of second flange sections 2b connected to the second cylinder section 2a. The second cylinder section 2a is disposed in a position with a predetermined space S from the first cylinder section 1a in the radial direction of the first cylinder section 1a. The pair of second flange sections 2b is disposed in positions with the predetermined space S from the pair of first flange sections 1b in the axial direction of the first cylinder section 1a.


Patent
Japan Superconductor Technology Inc. | Date: 2016-05-04

In order to reduce pressure fluctuations originating in a refrigerating machine, a gas-phase volume changing means (20), which communicates with a gas-phase space (10) above the liquid surface of liquid helium in a helium tank (2), is used to change the gas-phase volume of the gas-phase space (10) so as to cancel out pressure fluctuations in the helium tank (2).


Patent
Japan Superconductor Technology Inc. | Date: 2014-06-24

A cryostat includes a coolant tank, a refrigerator, a cylindrical member, and a gas phase volume-varying unit. The coolant tank houses a liquid coolant. The refrigerator is provided above the coolant tank and recondenses the coolant evaporated in the coolant tank. The cylindrical member houses a lower part of the refrigerator and forms a recondensing chamber that communicates with the coolant tank. The gas phase volume-varying unit communicates with a gas-phase space above a liquid surface of the liquid coolant in the coolant tank and varies a gas phase volume in the gas-phase space to cancel out a pressure fluctuation in the coolant tank.


Patent
Japan Superconductor Technology Inc. | Date: 2016-01-20

An improved critical current density and a high n value are achieved by allowing Nb filaments to be processed in a good shape. A precursor includes a plurality of primary assemblies. Each of the primary assemblies includes a bronze region and a plurality of Nb filaments embedded in the bronze region. The bronze region has a Sn concentration of 15% or more by weight. The primary assemblies satisfy 0.10 ds/df 0.35, wherein ds denotes a space between adjacent Nb filaments aligned in a direction toward a central portion of a cross section of each of the primary assemblies viewed in an axial direction of the corresponding primary assembly, and df denotes the diameter of the Nb filaments.


Patent
Japan Superconductor Technology Inc. | Date: 2014-06-10

A magnetic field generation apparatus includes a main coil and a variable-current correction coil. The main coil is formed by winding a ReBCO-based superconductive wire rod and generates a magnetic field in a measurement space. The variable-current correction coil is variable in a value of a current, coaxial with the main coil and disposed inside the main coil, and generates a magnetic field which corrects a uniformity of the magnetic field generated by the main coil.


Patent
Japan Superconductor Technology Inc. | Date: 2016-02-03

The purpose of the present invention is to reduce vibration derived from a refrigeration machine. A cryostat comprises: a helium tank (2) which stores liquid helium; a refrigeration machine (5) which is provided above the helium tank (2) and reliquefies the vaporized liquid helium in the helium tank (2); a cylindrical member (15) which houses the lower part of the refrigeration machine (5) and forms a liquefaction chamber (8) communicating with the helium tank (2); and a buffer tank (10) which stores helium gas and communicates with at least either the space above the surface of the liquid helium in the helium tank (2) or the liquefaction chamber (8). The gas-phase volumes of the helium tank (2) and the liquefaction chamber (8) increase by having the buffer tank (10) communicate with the helium tank (2) and the liquefaction chamber (8).


Patent
Japan Superconductor Technology Inc. | Date: 2014-03-07

The purpose of the present invention is to reduce vibration derived from a refrigeration machine. A cryostat comprises: a helium tank (2) which stores liquid helium; a refrigeration machine (5) which is provided above the helium tank (2) and re-liquefies the vaporized liquid helium in the helium tank (2); a cylindrical member (15) which houses the lower part of the refrigeration machine (5) and forms a liquefaction chamber (8) communicating with the helium tank (2); and a buffer tank (10) which stores helium gas and communicates with at least either the space above the surface of the liquid helium in the helium tank (2) or the liquefaction chamber (8). The gas-phase volumes of the helium tank (2) and the liquefaction chamber (8) increase by having the buffer tank (10) communicate with the helium tank (2) and the liquefaction chamber (8).


Patent
Japan Superconductor Technology Inc. | Date: 2016-01-20

The present invention is such that a main body neither drops out nor is destroyed. A plurality of brackets (4), provided on a side surface of a main body (2) in which a superconducting magnet is mounted internally in a state in which each protrudes therefrom, are each supported by a stand (3) from the bottom, and enclosing members (5) are attached to the side surface of the main body (2) with a prescribed space (a) opened from the bottom of the brackets (4). At least part of the inside surface of an enclosing member (5) surrounds a stand (3) in a non-contact state.


Patent
Japan Superconductor Technology Inc. | Date: 2016-04-20

In order to make it possible to improve the homogeneity of a magnetic field and suppress upsizing of a device as a whole, a current-variable correction coil (4) which generates a magnetic field for correcting the homogeneity of a magnetic field generated by a main coil (2) formed by winding an ReBCO based superconducting wire rod is provided inside the main coil (2). The magnetic field generated by the current-variable correction coil (4) is little affected by a shield current flowing through a superconducting layer of the ReBCO based superconducting wire rod.

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