Title:
REFRIGERATOR COOLING-TYPE SUPERCONDUCTING MAGNET
Document Type and Number:
WIPO Patent Application WO/2010/140398
Kind Code:
A1
Abstract:
The attenuation of a magnetic field during a permanent current mode operation is prevented, the generation of heat at a coupling portion between a permanent current switch and a superconducting coil is suppressed, and the increase of a superconducting coil cooling temperature in a current supply mode is minimized.
A refrigerator cooling-type superconducting magnet (J) is comprised of a superconducting coil (2); a permanent current switch (1) which switches from a permanent current mode to a current supply mode; first and second extremely-low temperature refrigerators (3, 4) which cool the superconducting coil (2) and the permanent current switch (1), respectively; and a vacuum container (10) which stores cooling stages (31, 32, 41, 42) for the superconducting coil (2), the permanent current switch (1), and the first and second extremely-low temperature refrigerators (3, 4). The refrigerator cooling-type superconducting magnet (J) is comprised of a superconducting wire (5) for coupling the superconducting coil (2) to the permanent current switch (1), and a superconducting bypass wire (6) electrically connected in parallel to the superconducting wire (5) in the longitudinal direction. The superconducting critical temperature of the superconducting bypass wire (6) is higher than the superconducting critical temperature of the permanent current switch (1).
Inventors:
TANAKA HIROYUKI (JP)
OKADA MICHIYA (JP)
TAKAHASHI MASAYA (JP)
ICHIKI YOTA (JP)
OKADA MICHIYA (JP)
TAKAHASHI MASAYA (JP)
ICHIKI YOTA (JP)
Application Number:
PCT/JP2010/053047
Publication Date:
December 09, 2010
Filing Date:
February 26, 2010
Export Citation:
Assignee:
HITACHI LTD (JP)
TANAKA HIROYUKI (JP)
OKADA MICHIYA (JP)
TAKAHASHI MASAYA (JP)
ICHIKI YOTA (JP)
TANAKA HIROYUKI (JP)
OKADA MICHIYA (JP)
TAKAHASHI MASAYA (JP)
ICHIKI YOTA (JP)
International Classes:
H01F6/04; H01F6/00; H01L39/04
Domestic Patent References:
| WO1997011472A1 | 1997-03-27 |
Foreign References:
| JPH10294213A | 1998-11-04 | |||
| JP2004179413A | 2004-06-24 | |||
| JPH10107333A | 1998-04-24 | |||
| JPH08130112A | 1996-05-21 |
Other References:
None
Attorney, Agent or Firm:
ISONO Michizo (JP)
Michizo Isono (JP)
Michizo Isono (JP)
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