A ruthenium oxide thermometer for dilution refrigerators operating down to 5 mK
| Autor: | Sean A. Myers, Hongxi Li, Gabor Csathy |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics - Instrumentation and Detectors
Materials science business.industry Refrigerator car FOS: Physical sciences General Physics and Astronomy Physics - Applied Physics Applied Physics (physics.app-ph) Instrumentation and Detectors (physics.ins-det) Ruthenium oxide Dilution Thermometer Optoelectronics General Materials Science Black-body radiation Radio frequency Resistance thermometer Absorption (electromagnetic radiation) business |
| Zdroj: | Cryogenics. 119:103367 |
| ISSN: | 0011-2275 |
| DOI: | 10.1016/j.cryogenics.2021.103367 |
| Popis: | At the lowest temperatures achieved in dilution refrigerators, ruthenium oxide resistance thermometers often saturate and therefore lose their sensitivity. In an effort to extend the range of such temperature sensors, we built a thermometer which maintains sensitivity to 5 mK. A key component of this thermometer is an in situ radio frequency filter which is based on a modern rf absorption material. We show that the use of such a filter is only effective when it is encased in the same rf-tight enclosure as the ruthenium oxide sensor. Our design delivers an attenuation level that is necessary to mitigate the effects of parasitic heating of a fraction of pW present in our circuit. Furthermore, we show that the likely origin of this parasitic heating is the black body radiation present within the experimental space of the refrigerator. We found that the equilibration time of the thermometer increases rapidly as the temperature is lowered; below 5 mK this thermometer becomes impractical because of the prohibitively long equilibration times. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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