An Optical Cryostat with helium-3 Sorption Refrigerator

An Optical Cryostat with helium-3 Sorption Refrigerator.

Trofimov V.N., Chernikov A.N.

An optical cryostat with ³Не sorption refrigerator is proposed. The refrigerator is mounted on a copper plate cooled by pulse tube cryorefrigerator SUMITOMO SRP-052A. It has both sorption steps: the first one with working gas ⁴Не is intended for condensation of ³Не, the second one with ³Не for cooling down to 0.3K. The cryostat is an independent device that does not contain the external gas communications aimed at reaching low temperatures, and working gases are stored in cans integrated with the cryostat at 50atm. Lowest temperature 0.3K is kept during 30 hours. Time of recondensation is about 0.5 hour.

optical cryostat with Helium 3 sorption refrigerator

³Не and ⁴Не pots are placed on one level and connected together by coper bridge.

⁴Не is condensing to ⁴Не pot then pumping to 2.2.K, at this time ³Не is condensing to own pot and colling to 2.2K. As soon as liquid ⁴Не is finished the sorption pump ³Не on. After 15 minutes temperature 0.3K is reached.

Неlium 3 and Helium 4 pots dilution

³Не and ⁴Не pots is closed by thermal shield.

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An Optical Cryostat with helium-3 Sorption Refrigerator.

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