Superconducting magnet system with refrigerator

Abstract

A cryostat (1) with a first helium tank (4) which contains helium at an operating temperature T1<3 K, and a second helium tank (2) which is connected to the first helium tank (4) and contains liquid helium at an operating temperature T2>3 K, wherein a cooling means (6) is provided in the first helium tank (4) which generates an operating temperature T1<3 K 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.

Dependencies are inferred from the claim text.