Superconducting magnet system with refrigerator

Details Superconducting magnet system with refrigerator Superconducting magnet system with refrigerator

2005-02-11

2008-01-15

Doerrler, William C (Department: 3744)

Refrigeration

Gas compression, heat regeneration and expansion, e.g.,...

C062S051100, C062S051200

Reexamination Certificate

active

07318318

ABSTRACT:
A cryostat (1) with a first helium tank (4) which contains helium at an operating temperature T1<3K, and a second helium tank (2) which is connected to the first helium tank (4) and contains liquid helium at an operating temperature T2>3K, wherein a cooling means (6) is provided in the first helium tank (4) which generates an operating temperature T1<3K in the first helium tank (4), wherein the cooling means (6) is designed as a Joule-Thomson valve with downstream heat exchanger from which pumped helium is transported to a room temperature region outside of the cryostat (1) is characterized in that a refrigerator (11) is provided whose cold end (19) projects into the second helium tank (2) and the supplied helium is returned during normal operation in a closed loop along the refrigerator (11) and into the second helium tank (2), thereby being pre-cooled and liquefied at the cold end (19) of the refrigerator (11). The inventive cryostat minimizes helium consumption, thereby permitting continuous measuring operation.

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