SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: Poster: Superconductivity II
TT 58.22: Poster
Donnerstag, 30. März 2023, 15:00–18:00, P2/OG3
Characterization of the cooling power on a two stage 4 K pulse tube cooler operated with solenoid valves — •Xaver Herrmann1, Jack-André Schmidt1,2, Bernd Schmidt1,2, Jens Falter2, and André Schirmeisen1,2 — 1Institute of Applied Physics, Justus-Liebig-University Giessen, Germany — 2TansMIT-Center for Adaptive Cryotechnology and Sensors, Giessen, Germany
Closed-cycle cryocoolers have become an important tool for low temperature scientific research[1]. Here we focus on Gifford-McMahon (GM) type pulse tube coolers (PTC), which offer low maintenance and long measurement periods. In order to create a temperature difference between the cold and hot end of the cooler, Helium is periodically compressed an expanded within the cooler. In order to do so a valve - commonly a rotary valve - allows high pressure Helium to enter the cooler or to relieve the pressure within. The high and low pressure levels are supplied by a Helium compressor[2].
In order to reduce complexity and improve flexibility of the system[3], this poster will look into the operation of a two stage 4 K PTC with solenoid valves. This removes the rotary valve from the system and therefore allows for easy access and change of parameters like high- and low-pressure duration, quiet times after high- and low-pressure pulse or frequency.
[1] R. Güsten et al., Nature 568, 357 (2019)
[2] R. Radebaugh, J. Phys.: Condens. Matter 21, 164219 (2009)
[3] S. Wild, Fortschr.-Ber. VDI Reihe 19 Nr. 105, Düsseldorf 1997