Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 60: Cryotechnique: Refrigeration and Thermometry

TT 60.1: Vortrag

Donnerstag, 19. März 2020, 15:00–15:15, HSZ 103

Characterization of mechanical vibrations and temperature oscillations on a low input power small scale 4 K pulse tube cryocooler — •Jack-Andre Schmidt1,2, Bernd Schmidt1,2, Jens Falter1,2, Günter Thummes1,2, and André Schirmeisen1,21Justus-Liebig-University Giessen — 2TransMIT GmbH

Closed-cycle cryocoolers have become an important cooling concept tool for scientific research at low temperatures [1]. We here focus on Gifford-McMahon (GM) type pulse tube cryocoolers (PTC), which offer long measurement periods and low maintenance, but they exhibit undesired intrinsic effects due to the working principle.

The presentation will be about the study of these effects on a small scale 4 K PTC [2] driven by a helium compressor with adjustable input power between 0.9 and 2.3 kW [3]. The compressor makes it possible to characterize mechanical vibrations and temperature oscillations as a function of helium pressure level inside the cold head. Furthermore, the adjustment of the compressor has also influence on the cooling performance. On the basis of the attained results it is possible to propose new cooling procedures for future applications with pulse tube cryocoolers.

[1] R. Güsten, et al., Nature 568 (2019) 357-359

[2] B. Schmidt, et al., Cryogenics 88 (2017) 129-131

[3] C. Chialvo, et al., Cryocoolers 18 (2014)

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