Electrically conductive shield for refrigerator

A conductive shielding and refrigerator technology, which is applied in refrigerators, refrigeration and liquefaction, circuits, etc., can solve the problems of expensive bismuth alloys and lack of thermal conductivity.

Active Publication Date: 2007-05-02
SIEMENS HEALTHCARE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of such a shield is that the bismuth alloy shield itself can be permanently magneti

Method used

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  • Electrically conductive shield for refrigerator
  • Electrically conductive shield for refrigerator
  • Electrically conductive shield for refrigerator

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Embodiment Construction

[0014] FIG. 1 shows a schematic diagram of a cryogenic magnet system equipped with a refrigerator 4 in a connection sleeve 5 . The particular cryogenic magnet system shown is an MRI magnet system. A liquid cryogen container 1 containing a superconducting magnet (not shown) is surrounded by one or more heat shields 2 which in turn are completely surrounded by a vacuum jacket 3 . Refrigerator 4 is detachably assembled to the magnet system, and is thermally and mechanically connected by connection sleeve 5, so as to cool the heat shield 2 through thermal connection 5a, which may be copper braided wire or Any other suitable known thermal connection. Although not required by the present invention, the interior of the connecting sleeve 5 may communicate with the interior of the cryogen container 1 , for example via a tube 6 . The refrigerator 4 can then recondense the evaporated refrigerant gas and convey it back to the refrigerant container 1 via the line 6 . During operation of...

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Abstract

A cryogenic magnet system, comprising a cryogenic vessel (1) housing a magnet winding, a vacuum jacket (3) enclosing the cryogenic vessel and a refrigerator (4) at least partially housed within the vacuum jacket and thermally linked (6) to the cryogenic vessel. In particular, the system further comprises an electromagnetic shield.

Description

technical field [0001] The invention relates to a cryogenic magnet arrangement for generating a uniform magnetic field. In particular, the present invention relates to a shield disposed around a cryogenic refrigerator to reduce the effect of the cryogenic refrigerator on the stability of a synthetic magnetic field. Background technique [0002] MRI magnet systems typically include cryogenic magnet arrangements and are used for medical diagnosis. MRI magnets require a stable, uniform magnetic field. To achieve stability, superconducting magnet systems are typically employed that operate at very low temperatures, which are typically maintained by cooling the superconductor by immersing it in a cryogenic fluid, usually liquid helium. Cryogenic fluids, especially helium, are expensive and it is desirable that the magnet system be designed and operated in such a way that the use of this cryogenic fluid is minimized. [0003] The superconducting magnet system generally includes...

Claims

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Application Information

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IPC IPC(8): H01F6/04F25B9/14G01R33/3815F17C3/08F17C13/00
CPCF17C2270/0536H01F6/04F17C2203/0312F17C2227/0353F17C2203/0629F17C2227/0381F17C3/085F17C13/007F17C2227/0379F17C2223/0161F17C2260/031F17C2227/0372F17C2203/0391F17C2221/017F17C2227/0337F17C2203/0687
Inventor T·J·休斯K·怀特S·J·S·利斯特
Owner SIEMENS HEALTHCARE GMBH
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