초록 ▼

A refrigeration system includes a dewar and a refrigerator/liquefier which meets the variable demands of a superconducting magnet within the dewar. The system is sized to meet average loads over a defined duty cycle, and is variably operable to meed demands. In the preferred embodiment, a first supp

A refrigeration system includes a dewar and a refrigerator/liquefier which meets the variable demands of a superconducting magnet within the dewar. The system is sized to meet average loads over a defined duty cycle, and is variably operable to meed demands. In the preferred embodiment, a first supply of fluid circulates through a “condenser”element positioned in a dewar ullage to liquefy a separate supply of fluid in the dewar, and to refrigerate a pulsed cryogenic load therein, such as a superconducting magnet. A portion of the first supply of fluid may be diverted to refrigerate a second pulsed cryogenic load, such as magnet current leads permanently connected to the magnet. The dewar includes a cold gas vapor storage chamber separate from the dewar ullage, and the chamber is preferably located within the inner core of a solenoid superconducting magnet for compact and thermally efficient design. Responsive, independent adjustment of refrigeration to pulsed cryogenic loads is made possible.

대표청구항 ▼

A dewar for storage of cryogenic fluid refrigerating a load, said dewar comprising: an outer vessel; an inner vessel defining a volume suitable for storage of a liquid cryogen including ullage thereabove, said volume further including a separately defined cold vapor storage chamber generally positio

A dewar for storage of cryogenic fluid refrigerating a load, said dewar comprising: an outer vessel; an inner vessel defining a volume suitable for storage of a liquid cryogen including ullage thereabove, said volume further including a separately defined cold vapor storage chamber generally positioned therein; a cold vapor line extending from said ullage to said cold vapor storage chamber, whereby vapor may be conveyed between said ullage and said chamber, and stored in said chamber at cryogenic temperatures; and a load comprising at least one superconducting magnet, said magnet substantially positioned within said inner vessel to receive cryogenic fluid, and at least partially surrounding a portion of said cold vapor storage chamber.