Abstract: A cooling system (RS) includes a vacuum insulation container (4), an object to be cooled (3), a cryogenic refrigerator (CR), a thermal conduction connector (TC), a temperature sensor (TS), current leads (D1, D2), and a controller. The temperature sensor detects the temperature of one of the object to be cooled, a cold stage, the thermal conduction connector, and the current leads. The controller performs an operation stop process to stop operation of the cryogenic refrigerator in a case in which, while the cryogenic refrigerator is operating, the temperature detected by the temperature sensors drops to a predetermined target cooling temperature, and an operation start process to start operation of the cryogenic refrigerator in a case in which, while operation of the cryogenic refrigerator is stopped, the temperature detected by the temperature sensor rises to a predetermined operation start temperature that is higher than the predetermined target cooling temperature.

Abstract: A magnetic field generating device 1 comprises: an iron core 2; a pair of superconducting coils 3; and one or a pair of vacuum heat-insulation containers 4, wherein the iron core includes: a yoke 21; and a pair of split iron core portions 22 that are formed separately from the yoke, are located inside the yoke, and face each other with a work space therebetween, each of the pair of superconducting coils is wound around a different one of the pair of split iron core portions in a circumferential direction about an axis that is parallel to a direction in which the pair of split iron core portions face each other, a pair of split iron core coil assemblies 5 are stored in the one or pair of vacuum heat-insulation containers, and the yoke is located outside the one or pair of vacuum heat-insulation containers.

Abstract: Provided is a DC magnetic field superconducting coil power supply device using a superconducting coil at low cost. A DC magnetic field superconducting coil power supply device 1 comprises: a superconducting coil 17; a power supply device 11 configured to supply a DC voltage; a plurality of chopper circuits 13 connected in parallel between one end of the power supply device 11 and one end of the superconducting coil 17; and a controller 18 configured to control the plurality of chopper circuits 13, wherein the controller 18 is configured to operate the plurality of chopper circuits 13 in a time-division manner when charging the superconducting coil 17.

Abstract: Provided is a DC magnetic field superconducting coil power supply device using a superconducting coil at low cost. A DC magnetic field superconducting coil power supply device 1 comprises: a superconducting coil 17; a power supply device 11 configured to supply a DC voltage; a plurality of chopper circuits 13 connected in parallel between one end of the power supply device 11 and one end of the superconducting coil 17; and a controller 18 configured to control the plurality of chopper circuits 13, wherein the 10 controller 18 is configured to operate the plurality of chopper circuits 13 in a time-division manner when charging the superconducting coil 17.

Abstract: A magnetic field generating device 1 comprises: an iron core 2; a pair of superconducting coils 3; and one or a pair of vacuum heat-insulation containers 4, wherein the iron core includes: a yoke 21; and a pair of split iron core portions 22 that are formed separately from the yoke, are located inside the yoke, and face each other with a work space therebetween, each of the pair of superconducting coils is wound around a different one of the pair of split iron core portions in a circumferential direction about an axis that is parallel to a direction in which the pair of split iron core portions face each other, a pair of split iron core coil assemblies 5 are stored in the one or pair of vacuum heat-insulation containers, and the yoke is located outside the one or pair of vacuum heat-insulation containers.

Abstract: The stability of power generation efficiency against variation of fluid speed and direction can be improved. The disclosed rotor 1 for a wind or water power machine includes a hub 10, supported by a main shaft, and blades 20, each having a root end 21 connected to the hub. In a projection plane perpendicular to a rotational center axis O of the rotor, a leading edge 31 of the blade has leading edge bulge portions 36 and 37 protruding forward in the rotor rotational direction only at two different locations in the rotor radial direction.

Abstract: A rotor for a wind/water power machine that can reduce fluid resistance. A rotor provided with a hub and blades. A projected plane perpendicular to a rotational center axis line of the rotor, front edges of the blades protrude, in at least one part, forward in the rotational direction of the rotor relative to a first line segment; front edge protruding tips thereof are disposed in positions separated outward in the radial direction of the rotor from the outer peripheral edge of the hub by a length 0.4 to 0.6 times the length of the blade; and portions of the front edges of the blades that extend from the ends on the inside in the radial direction of the rotor to the front edge protruding tips are curved or bent convexly, in at least one part, rearward in the rotational direction of the rotor relative to a second line segment.

Abstract: The stability of power generation efficiency against variation of fluid speed and direction can be improved. The disclosed rotor 1 for a wind or water power machine includes a hub 10, supported by a main shaft, and blades 20, each having a root end 21 connected to the hub. In a projection plane perpendicular to a rotational center axis O of the rotor, a leading edge 31 of the blade has leading edge bulge portions 36 and 37 protruding forward in the rotor rotational direction only at two different locations in the rotor radial direction.