•Journal•ISSN: 1880-0408
Journal of Cryogenics and Superconductivity Society of Japan
Cryogenic Association of Japan
About: Journal of Cryogenics and Superconductivity Society of Japan is an academic journal published by Cryogenic Association of Japan. The journal publishes majorly in the area(s): Superconductivity & Electromagnetic coil. It has an ISSN identifier of 1880-0408. It is also open access. Over the lifetime, 1267 publications have been published receiving 2880 citations. The journal is also known as: Journal of Cryogenics and Superconductivity Society of Japan & Cryogenic engineering (Tokyo. 1966).
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67 citations
TL;DR: In this article, two three-way rotary valves of the rotary type are arranged in parallel in a high-pressure refrigerant gas passage (15) of a compressor and a flow regulating member is interposed in the sub-gas passage (20).
Abstract: Two three-way valves (12) (13) of the rotary type are arranged in parallel in a high-pressure refrigerant gas passage (15) of a compressor (7). A high-temperature end portion of a cold accumulator (2) is communicated with one three-way valve (12) of the rotary type through a main gas passage (19) as well as a high-temperature end of a pulse tube (1) is communicated with the other three-way valve (13) of the rotary type through a sub gas passage (20). A low-pressure port of each three-way valve (12)(13) is communicated with a low-pressure refrigerant gas return passage (17) of the compressor (7) respectively. A flow regulating member (21) is interposed in the sub gas passage (20). Both the three-way valves (12) (13) are synchronously rotated. A valve opening-closing timing of the one three-way valve (12) or (13) is adjustably changed relative to that of the other three-way valve (13) or (12).
32 citations
TL;DR: In this article, a current limiter having a plurality of current limiting units provided for electric paths constituting a plurality-of-phases is described. And the current limiting unit is constituted by a superconducting coil functioning as a first current limiting element formed in a non-inductive winding manner by connecting two super-conducting coils in series, which superconducted coils are wound in opposite directions and equal in size and number of turns.
Abstract: There is disclosed a current limiter having a plurality of current limiting units provided for electric paths constituting a plurality of phases, Each current limiting unit is constituted by a superconducting coil functioning as a first current limiting element formed in a non-inductive winding manner by connecting two superconducting coils in series, which superconducting coils are wound in opposite directions and equal in size and number of turns, and a superconducting coil functioning as a second current limiting element connected in parallel to the first current limiting element and having a predetermined impedance value. These current limiting units are contained within a cryostat and separated by a magnetic shield member for electromagnetically isolating the respective phases.
29 citations
TL;DR: In this article, a radial type superconducting magnetic bearings have been developed for a 10 kWh-class flywheel energy storage system, where the rotor is suspended without contact via the pinning forces of the bulk superconductors that are arranged such that the c-axis of each superconductor is aligned parallel to the radial direction of the cylinder.
Abstract: Radial type superconducting magnetic bearings have been developed for a 10 kWh-class flywheel energy storage system. The bearings consist of an inner-cylindrical stator of YBCO bulk superconductors and an outer-rotor of permanent magnets. The rotor is suspended without contact via the pinning forces of the bulk superconductors that are arranged such that the c-axis of each superconductor is aligned parallel to the radial direction of the cylinder. In this paper, we describe the implementation of the stator part and report the SMB test results, namely that the rotor was successfully rotated at up to 7,500 rpm. Thus we succeeded in energy storage of 2.24 kWh.
26 citations
TL;DR: In this article, the thermal and mechanical properties of advanced composite materials have been studied in order to examine their applicability to cryogenic use, including carbon, silicon carbide and alumina fiber unidirectionally reinforced epoxies.
Abstract: Thermal and mechanical properties of advanced composite materials have been studied in order to examine their applicability to cryogenic use. Carbon, silicon carbide and alumina fiber unidirectionally reinforced epoxies were prepared as advanced composite materials and were compared with glass fiber reinforced epoxy. Thermal conductivity and thermal contraction have been measured in both directions parallel and perpendicular to fibers down to liquid helium and liquid nitrogen temperatures, respectively. To investigate mechanical properties, a four-point flexural test was also performed at room, liquid nitrogen and liquid helium temperatures, and Young’s moduli and breaking stress were calculated. Considering the specific modulus and the ratio of breaking stress to thermal conductivity, the advanced composite materials are found to be suitable for cryogenic structural support members.
26 citations