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An Efficient Damper of Thermal Oscillations for Two-Stage Pulse Tube Cryocoolers

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Abstract

We have developed a passive system to efficiently reduce the amplitude of temperature oscillations in low-frequency Pulse Tube (PT) cryocoolers. It consists of a small, well-insulated tank of liquid 4He, placed between the cold head of the PT and the user. As a result, we have been able to reduce the amplitude of thermal oscillations by a factor of 192, from 173 mK to 0.9 mK. The same damping efficiency can be obtained even if a thermal power of up to 100 mW is dissipated over it: the temperature oscillations remain consistently small as long as the Helium remains in its liquid phase. Even after its transition to the gas phase, the thermal oscillations continue to be stable, and despite increasing in amplitude by one order of magnitude, reaching 9 mK, they remain 19 times lower than those at the cold head of the PT. The advantage of this tool resides in the fact that it is a small, very compact sealed Helium reservoir, free of moving parts and external links.

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Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors thank Giorgio Dall’Oglio and Lorenzo Martinis for their help in assembling the instrument. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

  1. Science Department, Roma Tre University, 00146, Rome, Italy

    Gabriella Pizzo

  2. Department of Computer, Control and Management Engineering, Sapienza Rome University, 00185, Rome, Italy

    Valerio Dall’Oglio

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  1. Gabriella Pizzo
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  2. Valerio Dall’Oglio
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Correspondence to Gabriella Pizzo.

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Pizzo, G., Dall’Oglio, V. An Efficient Damper of Thermal Oscillations for Two-Stage Pulse Tube Cryocoolers. J Low Temp Phys 210, 506–513 (2023). https://doi.org/10.1007/s10909-022-02931-5

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  • DOI: https://doi.org/10.1007/s10909-022-02931-5

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