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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
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
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...