Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Superconductive type
Patent
1998-01-16
2000-03-14
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Superconductive type
324320, H01F 100
Patent
active
060378506
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a superconducting magnet apparatus used in various technical fields utilizing static magnetic fields and, more particularly, to a superconducting magnet apparatus that utilizes a superconducting composite element as a source for generating a static magnetic field, and to a method of regulating the magnetization thereof.
BACKGROUND ART
As is well known, superconducting magnet apparatuses are used in various fields. Generally known superconducting magnet apparatus is adapted so that superconducting wires are wound like a coil and is then dipped into liquid helium, which is contained in a refrigerant container and serves as a refrigerant for cooling superconducting materials, to thereby generate a magnetic flux, namely, a magnetic field in a previously set space, as disclosed in Japanese Unexamined Patent Publication No. 4-49948.
FIG. 68 illustrates an example of such a superconducting magnet apparatus. In a refrigerant container 11, a static-magnetic-field generating source 13 consisting of superconducting wire wound around a support 14 like coils is placed. Wire made of Nb3Sn or NbTi is used as the superconducting wire. Magnetic field generated by the aforesaid static-magnetic-field generating source 13 is formed in a static-magnetic-field space 18 along the central axis 19 thereof. Incidentally, the static-magnetic-field generating source 13 composed of a plurality of coils. Further, the magnetic filed formed in the static-magnetic-field-space 18 can be regulated by changing the number of turns of each of the coils. Moreover, a refrigerant, such as liquid helium, 12 for cooling superconducting materials is output from a refrigerant source 17 and is injected from a refrigerant injecting port 15 through cock 16 into the refrigerant container 11. Further, a magnetizing electric current to be supplied to the coils of the aforesaid static-magnetic-field generating source 13 is introduced thereto through a connector portion 21 and a persistent current circuit switch circuit 24 from an exciting power supply 20. The aforementioned persistent current circuit switch 24 is used when operating the static-magnetic-field generating source 13 in a persistent current mode. FIG. 69 shows an example of the persistent current circuit switch 24. Namely, the persistent current switch 24 is contained in the refrigerant container 11 together with the static- magnetic-field generating source 13 and is cooled by using the refrigerant 12 for cooling superconducting materials. Further, the aforesaid persistent current circuit switch 24 is obtained by winding a superconducting wire 28 together with a heater wire 29 like coils and by heat-insulating the wires by epoxy resin or the like. Superconducting wire made by using CuNi alloy as a base metal material is used as this superconducting wire 28. Further, a manganin heater wire is usually used as the heater wire 29. Static-magnetic-field generating source 13 is connected with the superconducting wire 28 and the exciting power supply 20 at persistent current joints P and Q, respectively. The switch 26 is provided at the side of the exciting power supply 20. The heater wire 29 is connected with a heater power supply 22 through a connector portion 23 (see FIG. 68), and a switch 27 is provided at the side of the heater power supply 22. When the heater wire 29 is heated, the temperature of the superconducting wire 28 becomes equal to or higher than a critical temperature Tc and thus the persistent current circuit switch 24 is brought into OFF-state. In contrast, when the heater wire 29 is not heated, the superconducting wire 28 is in a superconducting state, and thus the persistent current circuit switch 24 is put into ON-state.
To operate the static-magnetic-field generating source 13 in the persistent current mode, the following steps are performed.
(1) The static-magnetic-field generating source 13 and the persistent current circuit switch 24 are cooled by using the refrigerant 12 for cooling superconducting materials, and are put int
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Hara Nobuhiro
Hino Noriaki
Honmei Takao
Kakugawa Shigeru
Kawano Hajime
Donovan Lincoln
Hitachi Medical Corporation
Nguyen Tuyen T.
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