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AssigneeSiemens Magnet Technology Ltd.
InventorsTimothy John Hughes, Stephen Paul Trowell, Keith White
Estimating the term…
In order to minimize the loss of cryogen during transportation of superconductive magnet systems, or indeed at any time that the refrigerator is turned off, part of the boil-off gas is directed from the cryogen vessel through the refrigerator interface and past the refrigerator to cool the refrigerator. Some of the heat conducted along the refrigerator into the system is intercepted and removed by that part of the boil-off gas. The heat load onto the cryogenic vessel is thereby reduced, which in turn reduces the boil-off of cryogen from the cryogenic vessel. This part of the boil-off gas is then vented from the system along with the remainder of the boil-off gas, for example to leave the cryogenic liquid vessel via the access neck.
A cryostat comprising a cryogenic vessel provided with an access neck and a refrigerator located in an interface sock, being a chamber extending from the exterior of the cryostat to be in thermal connection with the cryogen vessel, wherein a passageway is provided from the interior of the cryogenic vessel, through the interface sock to atmosphere, such that a proportion of cryogen gas escaping from the cryogenic vessel flows through the passageway, thereby to cool the refrigerator, and another proportion of cryogen gas escaping from the cryogenic vessel flows through the access neck, the cryostat further comprising a means for regulating the flow of gas through the passageway, thereby to regulate the cooling of the refrigerator by escaping cryogen gas.
A cryostat comprising a cryogenic vessel provided with a thermal shield wherein a passageway is provided from the interior of the cryogenic vessel to atmosphere, such passageway being in thermal contact with a thermal shield which surrounds the cryogenic vessel, such that a proportion of cryogen gas escaping from the cryogenic vessel flows through the passageway, thereby to cool the thermal shield, and another proportion of cryogen gas escaping from the cryogenic vessel flows through the access neck.
(canceled)
Dependencies are inferred from the claim text.