Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 28: Cryotechnique: Refrigeration and Thermometry
TT 28.1: Vortrag
Dienstag, 2. April 2019, 11:15–11:30, H23
A small scale 4 K pulse tube cryocooler suitable for geophysical measurements — •Bernd Schmidt1,2, Jack Schmidt1,2, Jens Falter1, Günter Thummes1,2, and André Schirmeisen1,2 — 1TransMIT-Center for Adaptive Cryotechnology and Sensors, Giessen, Germany — 2Institute of Applied Physics, Justus-Liebig-University Giessen, Germany
Although pulse tube cryocoolers (PTCs) reaching liquid Helium temperature were already presented in the 1990s [1], they are still subject to vivid development in many directions. For instance, PTCs with cooling powers up to 2 W, capable of competing with large LHe cryostats, have been presented recently [2]. For such high cooling power, an input power of > 11 kW is needed. We here present a development in miniaturization of a small PTC providing 70 mW @ 4.2 K with low input power [3]. This PTC works with an air-cooled, single phase 1 kW Helium compressor and is suitable for sensitive low-temperature applications, such as SQUIDs, SNSPDs or TES. The working principle and design challanges of this cold head are discussed. The performance of cooling sensitive measurements is demonstrated with a proof-of-concept experiment of a dc SQUID in a geophysical setup [4].
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