An Optical Cryostat with 3Не 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 with temperature 4.2K in vacuum volume of helium cryostat. It has both sorption steps: the first with working gas 4Не
is intended for condensation of 3Не, the second 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.
The refrigerator can be used together with the cryocoolers of Gifford-McMahon or pulse tube types with cooling power not less than 0.3W/4K, thus allowing operating without any liquid cryoagents.