16 Result(s)
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Chapter
O. Motojima
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Chapter
Feasibility Study of Cooling System of New Superconducting Large Helical Fusion Reactor
The Ministry of Education has started a project of constructing a new superconducting fusion reactor as the main experimental apparatus of an Inter-university National Institute for Fusion Science which is est...
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Chapter
Analysis of Anomalous Resistivity in an Aluminium Stabilized Superconductor for the Large Helical Device
The helical coils of the Large Helical Device are pool-cooled superconducting coils. The conductor consists of Nb-Ti/Cu monoliths, pure aluminium stabilizer and a copper sheath. The copper sheath is necessary ...
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Chapter
Structural Analysis of the Large Helical Device
Structural analysis by finite element method has been carried out for the supporting structures of the Large Helical Device (LHD). The LHD has one pair of helical coils and three pairs of poloidal coils, all o...
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Chapter
Experimental Observation of Anomalous Magneto-Resistivity in 10–20 kA Class Aluminum-Stabilized Superconductors for the Large Helical Device
Degradation of recovery current due to the unexpected enhancement of resistivity of aluminum stabilizers has been observed in pool-boiling-type superconductors that have been developed for the helical coils of...
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Chapter
Construction and Commissioning Tests of a 10 kW Class Helium Refrigerator for the Large Helical Device
The Large Helical Device is a heliotron fusion experimental device in which magnetic fields are controlled exclusively by superconducting coils: a pair of helical coils and three pairs of poloidal coils1. The hel...
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Chapter
Fracture Toughness of Partially Welded Joints of SUS316 in High Magnetic Field at 4K
Two kinds of partially welded austenitic stainless steel joints were prepared using SUS 316, 75 mm thick. One joint was fabricated using tungsten inert gas welding and metal arc gas welding, and the other was ...
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Chapter
Design and Construction of Coil Supporting Structure and Cryostat Vessel for LHD
The Large Helical Device is a fusion experimental machine with all superconducting coils. Electromagnetic force generated by the coils is supported by the torus shaped “supporting structure” of 100 mm thick 31...
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Chapter
Completion of Helical Coils for LHD
Helical coils of LHD are large scale pool-cooled superconducting coils. In order to produce a fine magnetic surface, the accuracy of the coil position is very important. The required tolerance for manufacturin...
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Chapter
Development of a Cryogenic System for the Large Helical Device
The construction and the cooling schemes of the cryogenic system for the Large Helical Device (LHD) are reported. The LHD is the first fully superconducting heliotron type experimental fusion device, which is ...
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Chapter
Operation Characteristics of the Helium Refrigerator for the Large Helical Device with a Dummy Load Apparatus
The helium refrigerator/liquefier operation for the Large Helical Device (LHD) with a dummy load apparatus (DLA) has been conducted under four different refrigeration conditions: no heat load mode; precooling ...
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Chapter and Conference Paper
Performances of the Superconducting Coils for the Large Helical Device
The Large Helical Device (LHD) is a plasma physics experimental device with two superconducting helical coils and three pairs of poloidal coils. All assembly and attachment works of LHD were completed, and the...
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Chapter
LHD Cryogenic-Control System Performance Under Various Operating Conditions
The Large Helical Device (LHD), an experimental fusion apparatus, has conducted a second experiment cycle. The infrastructure of the LHD cryogenic control system (TESS) is a combination of a distributed contro...
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Chapter
Hydraulic Characteristics of Cable-in-Conduit Conductors for Large Helical Device
Poloidal field coils for the Large Helical Device (LHD) consist of Nb-Ti cable-in-conduit conductors. The first cool-down of LHD started in February of 1998, and the LHD experienced the cool-down three times u...
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Chapter
Overall Operating Characteristics of Superconducting Current-Feeder System for the LHD
A superconducting (SC) current-feeder system is used as the cuirait transmission lines fon the LHD. It consists of nine SC bus lines with total length of 497 m and nine pairs of gas-cooled current leads. The c...
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Chapter
Reliable Long-Term Operation of the Cryogenic System for the Large Helical Device
Reliability is discussed during long-term operations of the cryogenic system for the Large Helical Device (LHD). The cooled objects of LHD are the helical coils, the poloidal coils, the supporting structure an...
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Chapter
Spatial Distribution Measurement of High Energy Particle using Time-Of-Flight Neutral Particle Energy Analyzer in Large Helical Device
The time-of-flight neutral particle measurement system1 has been installed on the 10-O port at the 2nd campaign. It has the capability of two-dimensional measurement with a larger viewing angle by using the pivot...
