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New type of high temperature superconducting magnet.(Toshiba Corporation, Sumitomo Electric Industries Ltd.)(Brief Article)
Toshiba Corporation, Sumitomo Electric Industries Ltd. and Shinetsu
Semiconductor Co. Ltd. have jointly developed a high temperature superconducting magnet featuring a storage energy of 1,100kJ and coil centre magnetic field of 1 .5T.
This supermagnet is a by-product of a program designed to develop superconducting magnets for use in silicon monocrystal draw-up systems and enables superconducting magnets to be conveniently used in cooling systems without having to employ a cryogenic refrigerator.
Compared with the conventional type of liquefied helium cooling systems, it is now possible to build a high temperature superconducting magnetic system that is workable with a power consumption of just 3 k W, one Third, with respect to what has previously been the norm.
The new magnet as a superconductor utilises a silver (Ag) sheathed bismuth-based Bi2223 wire material (Bi, Pb)2Sr2Ca2Cu3Ox.
A number of salient basic technologies were established in this R & D work:
1) An ultralong wire having a length of 1,900 metres was developed as a high temperature superconducting wire for fabricating large magnets.
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