Claims
- 1. In a superconducting magnet cooling device including a helium tank, radiation heat shields, a vacuum tank, and a helium refrigerator, the improvement wherein said helium refrigerator is a multi-stage cold accumulation type refrigerator comprising a compressor disposed at an ordinary temperature, a helium gas as a common operating fluid to be compressed by said compressor, and one or more expansion chambers and cold accumulators of different temperature levels and employing an alloy or a compound of rare earth metals as a cold accumulating material of at least one cold accumulator; wherein thermal stages other than a final stage of the multi-stage cold accumulation type refrigerator are connected to the radiation heat stages in vacuum and the final stage of the multi-state cold accumulation type refrigerator is exposed inside the helium tank.
- 2. In a superconducting magnet cooling device including a helium tank, radiation heat shields, a vacuum tank, and a helium refrigerator, the improvement wherein said helium refrigerator is a multi-stage cold accumulation type refrigerator comprising a compressor disposed at an ordinary temperature, a helium gas as a common operating fluid to be compressed by said compressor, and one or more expansion chambers and cold accumulators of different temperature levels and employing an alloy or a compound of rare earth metals as a cold accumulating material of at least one cold accumulator; wherein a cylinder is provided which penetrates the vacuum tank from a normal temperature portion to the helium tank and in which the multi-stage cold accumulation type refrigerator is installed.
- 3. In a superconducting magnet cooling device including a helium tank, radiation heat shields, a vacuum tank, and a helium refrigerator, the improvement wherein said helium refrigerator is a multi-stage cold accumulation type refrigerator comprising a compressor disposed at an ordinary temperature, a helium gas as a common operating fluid to be compressed by said compressor, and one or more expansion chambers and cold accumulators of different temperature levels and employing an alloy or a compound of rare earth metals as a cold accumulating material of at least one cold accumulator; wherein a multi-stepped cylinder is provided in compliance with an outer configuration of the multi-stage cold accumulation type refrigerator which penetrates the vacuum tank from a normal temperature portion to the helium tank and which is installed in the multi-step cylinder.
Priority Claims (6)
Number |
Date |
Country |
Kind |
63-284450 |
Nov 1988 |
JPX |
|
63-284452 |
Nov 1988 |
JPX |
|
63-284453 |
Nov 1988 |
JPX |
|
63-284454 |
Nov 1988 |
JPX |
|
63-284455 |
Nov 1988 |
JPX |
|
63-285991 |
Nov 1988 |
JPX |
|
Parent Case Info
The present application is a continuation of application Ser. No. 07/890,265, filed May 29, 1992, now U.S. Pat. No. 5,293,749, which is a divisional of (1) application Ser. No. 07/722,547, filed Jun. 26, 1991, now U.S. Pat. No. 5,154,063, (2) of application Ser. No. 07/721,816, filed Jun. 26, 1991, now U.S. Pat. No. 5,144,805, and (3) of application Ser. No. 07/721,135, filed Jun. 26, 1991, now U.S. Pat. No. 5,144,810, each of which is, in turn, a divisional of application Ser. No. 07/430,582, filed Nov. 1, 1989, now U.S. Pat. No. 5,092,130.
US Referenced Citations (4)
Related Publications (2)
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Number |
Date |
Country |
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721816 |
Jun 1991 |
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721135 |
Jun 1991 |
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Divisions (2)
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Number |
Date |
Country |
Parent |
722547 |
Jun 1991 |
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Parent |
430582 |
Nov 1989 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
890265 |
May 1992 |
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