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In a cryostat composed of a first liquefied gas reservoir containing therein a first liquefied gas, a second liquefied gas reservoir containing therein a second liquefied gas, which has a boiling point higher than that of the first liquefied gas, the second liquefied gas reservoir being provided aro

In a cryostat composed of a first liquefied gas reservoir containing therein a first liquefied gas, a second liquefied gas reservoir containing therein a second liquefied gas, which has a boiling point higher than that of the first liquefied gas, the second liquefied gas reservoir being provided around the first liquefied reservoir in order to reduce the heat leak into the first liquefied gas reservoir, and an outer wall surrounding the second liquefied gas reservoir through a vacuum space, a refrigerating machine is arranged in the space within the outer wall and cools the second liquefied gas in the second and first liquefied gas reservoirs and the first liquefied gas whereby the cryostat may be used continuously for a long period of time without periodically supplying the second and third gases.

대표청구항 ▼

A cryostat with a refrigerating machine, comprising a first liquefied gas reservoir containing therein a first liquefied gas, a second liquefied gas reservoir containing therein a second liquefied gas, said second liquefied gas having a boiling point higher than that of the first liquiefied gas and

A cryostat with a refrigerating machine, comprising a first liquefied gas reservoir containing therein a first liquefied gas, a second liquefied gas reservoir containing therein a second liquefied gas, said second liquefied gas having a boiling point higher than that of the first liquiefied gas and said second liquefied gas reservoir being provided around the first liquefied gas reservoir, an outer wall adapted to surround the second liquefied gas reservoir through a vacuum space, said refrigerating machine including a heat exchanger and an expansion device and having a first section which is kept at a temperature higher that that of said second liquiefied gas reservoir, said first section being provided between the second liquefied gas reservoir and said outer wall; said refrigerating machine having a second section which is kept at a temperature lower than that of said second liquefied gas reservoir, said second section being provided between said first liquefied gas reservoir and said second liquefied gas reservoir, and said cryostat further comprising at least one condenser heat exchanger for recondensing the evaporated gas with a cooled coolant generated in the refrigerating machine, said at least one heat exchanger being provided at least in said first liquefied gas reservoir, and thermal contact means in contact with the refrigerating machine for cooling the second liquefied gas reservoir.