Autonomous type cryostats
Series CRYOPT/vac (vacuum sample)
Cryostat series of combinations in which the sample is in vacuum ( 10-3 mm Hg. Cent.). Coolant (helium / nitrogen ) is located in the inner cryostat vessel and enters the mine through a capillary with the sample from the bottom of the mine. They are designed to operate in the temperature range from 5 (90) K to 300 K. The sample is located in a vacuum chamber inside the mine. Chamber temperature is regulated by a system of two-level control ( temperature control exchanger and a flow rate of cryogenic gas ). The sample is in thermal contact with the walls of the vacuum chamber. Low intake of cold agent (typically ‹0.1 liter/h) ensures long running time with one filling They can be used as a nitrogen cryostat with helium filling containers with liquid nitrogen.
Inside the cryostat are helium and nitrogen tanks. Nitrogen tank used for cooling heat shield. The liquid is fed through cryoagent kapylyar of the lower chamber prior zaholodzhennya and evaporated in the heat exchanger. The heat exchanger is located in the bottom of the chamber prior zaholodzhennya. Temperature gaseous helium/nitrogen regulated through the assignment of electric currents in the heat exchanger. The vacuum chamber is cylindrical in shape and is located inside the chamber prior zaholodzhennya. The walls of the vacuum chamber cooled by cryogenic gas stream which rehulyuyetsyaya dyfferentsiynym pressure regulator located in manostati. The combined system controlling the flow of gas and the temperature of the heat exchanger allows to obtain highly accurate temperature maintenance and low cost of liquid cryogen. Temperatures below 5 K is achieved cryogenic pumping gas. Replacing the sample through the upper flange shaft.
The main parameters and modifications cryostats series CRYOPT/vac| Design Features | À204 | À206 | À222 |
|---|---|---|---|
| Optical inputs, location: Direction axes in cross section, deg. |
00-1800-2250 | 00-1800 | 00-1800 |
| Material internal windows (optional) | Fused quartz, leykosapfir, ZnSe, CdTe. mylar | ||
| The diameter of the internal windows (light appertura), mm | ∅17 | ∅14 | ∅50 |
| Nitrogen tank capacity, l | 1,5 | 1,5 | 1,5 |
| Helium tank capacity, l | 3,0 | 2,7 | 2,0 |
| Refrigeration time, min | 70 | 70 | 70 |
| Maximum flow of liquid helium, l/h | |||
| 8 Ê | 0.1 | 0.1 | 0.1 |
| 80 Ê | 0.08 | 0.08 | 0.08 |
| Temperature sensor | Silicon thermal diode | ||
| The stability of the temperature, K | ±0,05 | ±0,05 | ±0,05 |
| When replacing the sample, h | 18 | 18 | 18 |
| The diameter of the sample, mm | ∅28 | ∅17 | ∅50 |
| Weight, kg | 12 | 14 | 9 |
| Type temperature controller | Ê43 | ||
| The regulation (helium), K | 8-350 | 8-350 | 8-350 |
| The regulation (nitrogen), K | 90-350 | 90-350 | 90-350 |
| Working time, hours, at 8 K (helium) | 30 | 30 | 30 |
| Working time, hours, at 80 (nitrogen) | 32 | 32 | 32 |
| Distance between opposing windows on clearance, mm. | 106 | 100 | 100 |
| The height of the axle boxes to the lower edge of the cryostat, mm. | 96 | 78 | 60 |
| Individual features | It is possible to rotate inside of the cryostat around the vertical axis | 1) It is possible to move inside of the cryostat around the vertical axis 2) There yustyruvalnyy table with just moving the cryostat on the 2nd horizontal axes ±10 mm |
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