Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 28: Cryotechnique: Refrigeration and Thermometry
TT 28.2: Vortrag
Dienstag, 2. April 2019, 11:30–11:45, H23
Analysis of intrinsic variations of a small scale low input power 4 K pulse tube cryocooler driven by smart Helium compressor — •Jack-Andre Schmidt1,2, Bernd Schmidt1,2, Jens Falter2, Stefano Spagna3, Günter Thummes1,2, and André Schirmeisen1,2 — 1Justus-Liebig-Universität Gießen — 2TransMIT GmbH — 3Quantum Design, inc.
Today’s research often exceed the available measurement time with liquid helium cryostats. Closed cycle cryocooler offer the possibility of almost nonstop cooling around 4 Kelvin, but suffer from intrinsic temperature and mechanical variations due to their working principle with high and low pressure phases. Among the regenerative cryocoolers, pulse tube cold heads stand out because of the absence of moving parts at the cooled parts, which is a preferable choice for sensitive applications. Here we present an experimental study of the intrinsic effects of a minimized 4 K pulse tube [1]. For the first time a broad parameter set can be studied by using a smart energy compressor [2]. The results show potential aspects that should be considered to reduce intrinsic effects in future cryostat designs.
Schmidt B., et al., Cryogenics 88 (2017) 129-131.
Chialvo, C., et al., Proceedings of Cryocoolers 18 (2014).