Dresden 2020 – wissenschaftliches Programm
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TT 16.47: Poster
Montag, 16. März 2020, 15:00–19:00, P2/EG
Development and characterization of a small scale two-stage pulse tube cryocooler — •Bernd Schmidt1,2, Jack-André Schmidt1,2, Jens Falter2, Günter Thummes1,2, and André Schirmeisen1,2 — 1Justus-Liebig Universität Gießen, Germany — 2TransMIT GmbH, Gießen, Germany
Small scale pulse tube cryocoolers with input powers < 2 kW are a valuable alternative for liquid Helium cryostats, especially for long time measurements. In this input power regime, Helium compressors with air cooling and single phase power supply are commercially available, lowering the requirements for the measuring environment. Also, since pulse tube cryocoolers are closed cycle systems, the refilling of cryogen is not needed, leading to long running intervals of up to several years and less usage of Helium gas, which is consistently suffering of shortages .
In this poster, we present the development process of a new 4 K two-stage pulse tube cryocooler with an input power of about 1 kW . The cryocooler reaches temperatures of < 2.5 K and provides a cooling power of > 70 mW at liquid Helium temperature. The cryocooler was simulated using Sage and Regen simulation environments. Afterwards it was fabricated, tested and optimized using a SHI CNA-11 Helium compressor with about 1 kW input power. A cooling load map was measured to characterize the system.
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 Schmidt, B., et al., Cryogenics 88 (2017): 129-131.