1 K cryostat with sub-millikelvin stability based on a pulse-tube cryocooler
| Autor: | Sara M. Mueller, Stuart B. Field, August DeMann |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Cryostat Materials science Liquid helium Capillary action General Physics and Astronomy chemistry.chemical_element Thermodynamics Mechanics Cryocooler 01 natural sciences law.invention chemistry law 0103 physical sciences Heat exchanger General Materials Science Physics::Atomic Physics 010306 general physics Lambda point refrigerator Pulse tube refrigerator Helium |
| Zdroj: | Cryogenics. 73:60-67 |
| ISSN: | 0011-2275 |
| DOI: | 10.1016/j.cryogenics.2015.11.008 |
| Popis: | A cryogenic system has been designed and tested that reaches a temperature below 1.1 K, with an rms temperature stability of 25 μ K. In this system a commercial pulse-tube cryocooler is used to liquify helium gas supplied from an external source. This liquid helium enters a 1 K pot through a large-impedance capillary tube, similar to a conventional 1 K system operated from a liquid helium bath. Unlike a conventional system, however, the molar flow rate of the system can be varied by changing the pressure of the incoming helium. This allows for a trade-off between helium usage and cooling power, which has a maximum value of 27 mW. The measured cooling power and fraction of helium exiting the capillary as liquid agree well with predictions based on an isenthalpic model of helium flow through the capillary. The system is simple to use and inexpensive to operate: The system can be cooled to base temperature in about 3 h and, with a flow rate giving a cooling power of 13 mW, the helium cost is around $6 per day. |
| Databáze: | OpenAIRE |
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