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Superconducting magnet apparatus

By independently cooling the high-temperature and low-temperature superconducting coils in the superconducting magnet device, using a combined Gifford-McMahon and Joule-Thomson refrigerator system, the problem of high-temperature superconductivity during excitation or demagnetization of the superconducting magnet device is solved The heating problem caused by coil hysteresis loss achieves efficient cooling performance and maintenance of high magnetic field.

Active Publication Date: 2014-12-31
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Low-temperature superconducting coils have reduced hysteresis loss through the development of low-loss conductors such as ultra-fine multi-core wires, but high-temperature superconducting coils have relatively large hysteresis losses
[0011] On the other hand, in order to achieve a high magnetic field, there is a need to increase the size of the high-temperature superconducting coil, and there is a problem that it is necessary to greatly increase the cooling capacity

Method used

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no. 1 approach

[0018] Embodiments of the present invention will be described below with reference to the drawings.

[0019] Such as figure 1 As shown, the superconducting magnet device 30 of the first embodiment includes: a first superconducting coil 11, which is cylindrical, and is disposed in a vacuum vessel 31; a second superconducting coil 12, which is cylindrical, and is surrounded by the first superconducting coil. The outer side of a superconducting coil 11, and is arranged coaxially with the first superconducting coil 11; the first cooling part 10, cools the first superconducting coil 11; and the second cooling part 12, and the first cooling part 10 are controlled separately and independently to cool the second superconducting coil 12 .

[0020] In each embodiment, the first superconducting coil 11 is a high temperature superconducting coil 11 .

[0021] On one side end face of the high temperature superconducting coil 11 (in figure 1 A first cooling stage (stage) 14 is connected ...

no. 2 approach

[0066] Next, refer to figure 2 A second embodiment of the present invention will be described. In addition, in figure 2 with figure 1 Common configurations or functions are denoted by the same symbols, and repeated explanations are omitted. In addition, in figure 2 omitted figure 1 The description of the second cooling unit 20 is shown in the figure.

[0067] In this second embodiment, cooling stages 14 a and 14 b are connected to both ends of the high temperature superconducting coil (first superconducting coil 11 ), and cooling is performed from both ends of the high temperature superconducting coil 11 .

[0068] Pipes 43a, 43b extending from the gas circulation heat transfer circuit 40 are passed through these cooling stages 14a, 14b so that heat exchange can be performed.

[0069] Furthermore, these pipes 43a, 43b are provided to reciprocate multiple times between the superconducting coil 11 to be cooled so that the refrigerant passes through the GM refrigerator 3...

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Abstract

The invention provides a superconducting magnet apparatus effectively cooling great amount of heat. According to one embodiment, a superconducting magnet apparatus includes: a first superconducting coil arranged in a vacuum container and a second superconducting coil outside the first superconducting coil; a first cooling unit which is configured to cool the first superconducting coil; and a second cooling unit 20 which is configured to be controlled independent of the first cooling unit 10. The second superconducting coil is cooled with a different method from that for cooling the first cooling unit cooling.

Description

technical field [0001] The present invention relates to a superconducting magnet device for generating a high magnetic field. Background technique [0002] Utilizing the property that the electrical resistance becomes zero when cooled to an ultra-low temperature, a superconducting coil (coil) can increase the current density without generating Joule heat, and is suitable for generating a high magnetic field. A superconducting magnet device composed of such a superconducting coil is widely used as a high magnetic field generating device in the field of research on physical properties. [0003] Here, the superconducting coil needs to be cooled to an ultralow temperature of about 4K, and liquid helium (helium) or the like is used as a refrigerant. [0004] This liquid helium is difficult to directly handle and is not abundant in resources, so a method of cooling a superconducting coil using a cryogenic refrigerator has been popularized in recent years. [0005] In particular,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F6/00H01F6/06H01F6/04
CPCF25D19/00F25B2400/06H01F6/04H01F6/06
Owner KK TOSHIBA
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