Abstract: 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.

Abstract: 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.

Abstract: In a coated high-temperature superconducting wire 1 in which a superconducting yttrium-based wire (high-temperature superconducting wire) 2 having a rectangular cross section is coated by an insulating layer 6, the insulating layer 6 is an electrodeposited film made of block copolymerized polyimide which contains siloxane bonds in a polyimide main chain and which has molecules with anionic groups. A coil formed from the superconducting yttrium-based wire 2 is impregnated with epoxy resin, and the epoxy resin is cured. The coil is configured such that the epoxy resin is completely separated from the superconducting yttrium-based wire 2 by the insulating layer 6.

Abstract: In a coated high-temperature superconducting wire 1 in which a superconducting yttrium-based wire (high-temperature superconducting wire) 2 having a rectangular cross section is coated by an insulating layer 6, the insulating layer 6 is an electrodeposited film made of block copolymerized polyimide which contains siloxane bonds in a polyimide main chain and which has molecules with anionic groups. A coil formed from the superconducting yttrium-based wire 2 is impregnated with epoxy resin, and the epoxy resin is cured. The coil is configured such that the epoxy resin is completely separated from the superconducting yttrium-based wire 2 by the insulating layer 6.

Abstract: In a cryogenic loop heat pipe, a working fluid for heat transport is contained in a loop capillary tube, and a portion of the loop capillary tube is used as a heat absorbing portion (A) while a portion other than the heat absorbing portion (A) is used as a heat dissipating portion (B). In this heat pipe, when the heat exchange length of the heat absorbing portion A of the capillary tube is represented by l, and the inner diameter of the capillary tube at the heat absorbing portion A is represented by d, l and d satisfy 15d<l<882d. When a Laplace constant L is given by L=[&sgr;/{(&rgr;1−&rgr;v)g}]0.5, the inner diameter d satisfies L<d<3L.

Abstract: A cold accumulating material for extremely low temperature cold 1 is formed by filling pores 3 of a porous carrier 2 with magnetic particles 4 containing a rare earth element. The porous carrier 2 is desired to be formed of a sheet-shaped porous metal. A refrigerator according to this invention contains a cold reserving unit 5 filled with the aforementioned cold accumulating material for extremely low temperature cold 1. The above described structure is capable of exerting a sufficient refrigerating capacity with a small pressure loss of refrigerant (operating medium) and providing a cold accumulating material for extremely low temperature cold easy to process to a shape reducing the pressure loss and a refrigerator using the same.

Abstract: In the adiabatic apparatus of the present invention, a vessel includes an adiabatic layer in which an object is taken. A plurality of thermal shield plates are located in the adiabatic layer. Each thermal shield plate concentrically surrounds the object. A temperature control section cools or heats the object and the plurality of thermal shield plates. A switch section thermally connects the temperature control section to the plurality of thermal shield plates and the object if temperature of the plurality of thermal shield plates and the object is controlled, and thermally separates the temperature control section from the plurality of thermal shield plates and the object if control of the temperature of the plurality of thermal shield plates and the object is completed.

Abstract: A cryogenic cooling apparatus is provided, wherein the degree of freedom of installation and use is increased without deteriorating the reliability or stability and the range of uses of the apparatus is also increased. A coil unit and a refrigeration unit are positioned such that a second heat conductive member disposed on an extendible wall of a vacuum container and a fourth heat conductive member disposed on an extendible wall of another vacuum container face each other coaxially. In this state, the coil unit and refrigeration unit are relatively moved to approach each other, and thus the second heat conductive member and fourth heat conductive member come in contact. If the coil unit and refrigeration unit are further moved, the extendible wall extends and consequently the second heat conductive member comes in contact with a first heat conductive member. In addition, the extendible wall contracts and consequently the fourth heat conductive member comes in contact with a third heat conductive member.

Abstract: A superconducting magnet apparatus comprises a superconducting coil unit, and a refrigerant-filled chamber type refrigerator having a plurality of cooling stages. At least a final cooling stage of the cooling stages includes a static-type refrigerant-filled chamber and is associated with the superconducting coil unit, and at least a first cooling stage of the cooling stages includes a movable-type refrigerant-filled chamber.

Abstract: A cryogenic refrigerator includes a first refrigerant filled in a final refrigerating force storage chamber on a high temperature side thereof and consisting essentially of a composition expressed by (a) (Er.sub.(x) R.sub.(1-x)).sub.3 Ni.sub.(y) Co.sub.(1-y), or (b) Er.sub.(x) R.sub.(1-x) Ni.sub.(y) Cu.sub.(1-y) wherein 0.ltoreq.x.ltoreq.1, 0.ltoreq.y.ltoreq.1, and R denotes a rare earth element selected from the group consisting of Y, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Tm, Yb and Sc, a second refrigerant filled in the final refrigerating force storage chamber on a low temperature side thereof and consisting essentially of a composition expressed by (f) Er.sub.(x) R.sub.(1-x) Ni.sub.(y) Co.sub.(1-y), or (g) (Er.sub.(x) R.sub.(1-x)).sub.3 AlC.sub.(y) wherein 0.ltoreq.x.ltoreq.1, 0.ltoreq.y.ltoreq.

Abstract: The present invention provides a pulse tube refrigerator, comprising a regenerator having an inlet port and an outlet port, a pulse tube having one end portion connected in series to the outlet port of the regenerator, a gas compressor connected to the inlet port of the regenerator, a first valve disposed between the discharge port of the gas compressor and the inlet port of the regenerator, a second valve disposed between the suction port of the gas compressor and the inlet port of the regenerator, a first valve controller for selectively opening/closing alternately the first and second valves to permit a high pressure coolant gas discharged from the discharge port of the gas compressor to be guided into the pulse tube through the regenerator and, then, to permit said coolant gas to be sucked into the gas compressor through the suction port thereof via the reverse passageway so as to generate coldness, a third valve disposed between the other end portion of the pulse tube and the discharge port of the gas co

Abstract: A cryostat housing an ultra-low temperature medium includes a container for storing the ultra-low temperature medium, a pipe for communication between the inner and outer sections of the container, at least one tubular member interposedly arranged inside the pipe between the pipe and an opening, a heat anchor section for cooling the pipe, and a plate-shaped member positioned so that a gas layer of the ultra-low temperature medium inside the tubular member divides the tubular member longitudinally.

Abstract: The present invention provides a pulse tube refrigerator, comprising a regenerator having an inlet port and an outlet port, a pulse tube having one end portion connected in series to the outlet port of the regenerator, a gas compressor connected to the inlet port of the regenerator, a first valve disposed between the discharge port of the gas compressor and the inlet port of the regenerator, a second valve disposed between the suction port of the gas compressor and the inlet port of the regenerator, a first valve controller for selectively opening/closing alternately the first and second valves to permit a high pressure coolant gas discharged from the discharge port of the gas compressor to be guided into the pulse tube through the regenerator and, then, to permit said coolant gas to be sucked into the gas compressor through the suction port thereof via the reverse passageway so as to generate coldness, a third valve disposed between the other end portion of the pulse tube and the discharge port of the gas co

Abstract: A cryogenic refrigerator comprising a closed cylinder provided with an inlet and an outlet for introducing and discharging a coolant gas into and out of the cylinder, a displacer slidably housed in the closed cylinder and housing a cooling member therein and having a passage through which the coolant gas flows, a device coaxially arranged in and along the passage of the displacer in which the cooling member is housed to divide the passage into outer and inner ones, a device for reciprocating the displacer in the cylinder, and a device for repeating the process of introducing the high pressure coolant gas into the cylinder through the inlet and discharging it out of the cylinder, synchronizing with the reciprocating displacer.

Abstract: A helium cooling apparatus according to the present invention comprises a refrigerator for cooling a refrigerant. The refrigerator is connected with the proximal end of a transfer line, which is used to transport the refrigerant. A port with a predetermined diameter is formed in a liquid-helium container which contains liquid helium. A condensation-heat exchanger, which is connected to the distal end of the transfer line, is inserted into the liquid-helium container through the port. A heat-transfer surface of the heat exchanger is formed with a plurality of grooves extending in the gravitational direction. The refrigerant is evaporated in the heat exchanger, and condensed liquid helium, adhering to the heat-transfer surface, drops along the grooves when helium gas in the liquid-helium container is cooled to be recondensed. Accordingly, the heat-transfer surface cannot be covered with the condensed liquid helium, so that a wide heat-transfer area can be secured.

Abstract: Disclosed is a superconducting apparatus comprising a superconducting coil and a cooling apparatus for cooling this superconducting coil. The cooling apparatus is constituted by a cooling medium circulating path for subjecting a cooling medium to a vaporization/liquefication cycle, and a temperature equalizing plate for effecting a uniform cooling of the superconducting coil by the cooling medium. The cooling medium circulating path is constituted by a pair of flowing-down parts through which a liquid cooling medium flows downwards by gravity, and a pair of vaporization parts through which the liquid cooling medium flows upwards while it is being vaporized. The temperature-equalizing plate covers the peripheral surface making one entire round of the superconducting coil around the axis of the coil. It is divided into at least two parts at its lower end, which are electrically insulated from each other.

Abstract: A magnetic refrigerating apparatus comprises a working substance adapted to produce heat when magnetized, and cool down when demagnetized, a superconductive coil for applying a predetermined magnetic field to the working substance, a regenerating pipe having a high-temperature portion and a low-temperature portion and being movable between a first position, where the high-temperature portion is located far away from the coil, and the low-temperature portion is located close to the coil, and a second position where the high-temperature portion is located close to the coil, and the low-temperature portion is located inside a vessel. The working substance and the regenerating pipe are respectively, so moved that the regenerating pipe is in the second position when the working substance is in the magnetization position, and that the regenerating pipe is in the first position when the working substance is in the demagnetization position.

Abstract: A magnetic refrigerator includes a plurality of working substances each of which, when it is within a magnetic field, generates heat and, when it is outside the magnetic field, absorbs the heat to permit a gas to be condensed on the outer surface of the working substance. The working substance has even surfaces and an uneven surface formed on said outer surface thereof. A heat elimination system which, only when the working substance is within the magnetic field, contacts the even surfaces of the working substance to take the heat from the working substance, is provided.

Abstract: A working material used in a magnetic refrigerator radiates heat when it is magnetized and absorbs heat when it is demagnetized. The working material is cylindrical and extends vertically. A heat pipe has a cylindrical internal space directly surrounding the peripheral surface of the working material and containing helium gas as a heat medium. The peripheral surface of the working material in contact with the internal space functions as a condensing surface of the heat pipe. A superconductive coil surrounds the working material and intermittently applies a magnetic field thereto. A refrigerator unit supplies a cooling space with helium gas at 20.degree. K. or below. The helium gas from the refrigerator unit removes heat produced from the working material when it is adiabatically magnetized by the coil. When the working material is adiabatically demagnetized, it rapidly absorbs heat to cool the helium gas in the internal space of the heat pipe.

Abstract: A magnetic refrigerating apparatus comprises two pairs of superconductive coils for generating magnetic fields, a tank for receiving helium to be cooled, and a pair of heat absorbers each including a working substance adapted to generate heat when located inside the magnetic field generated by the coils and to absorb heat when located outside the magnetic field. The heat absorbers are alternately transferred between a first position where either of the heat absorbers is located inside the magnetic field and a second position where the heat absorber is located outside the magnetic field so that one of the heat absorbers is in the first position when the other is in the second position, whereby helium is cooled by either of the heat absorbers when the heat absorber is in the second position.