Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 36: Nanotubes, BEC, Cryocoolers: Poster
TT 36.9: Poster
Mittwoch, 19. März 2025, 15:00–18:00, P3
Optimisation of Rotary Valve Size and Timing for High Massflow GM-Type Pulse Tube Cryocoolers — •Xaver Herrmann1, Jack-André Schmidt1,2, Bernd Schmidt1,2, Jens Falter2, and André Schirmeisen1,2 — 1Instiute of Applied Physics, Justus-Liebig University, Giessen, Germany — 2TransMIT-Center for Adaptive Cryotechnology and Sensors, Giessen, Germany
Closed-cycle cryocoolers have become a reliable and important tool for low temperature scientific research, such as IR astronomy, SNSPDs or surface science[1]. Here we focus on Gifford-McMahon (GM) type pulse tube cryocoolers (PTC), which offer low maintenance and long measurement periods[2]. A crucial component of a GM type PTC is the rotary valve. Losses in the rotary valve are a sizable fraction of overall losses in a GM type PTC [3,4]. This poster will focus on the effects of valve size and timing for a two stage high input power system(11 kW).
Both valve size and timing show a strong effect on cooling performance of the first cooling stage. An increase of up to 90
[1] R. Güsten et al., Nature 568 (2019) 357.
[2] R. Radebaugh, J. Phys.: Condens. Matter 21 (2009) 164219.
[3] D. Liu et al., Cryogenics 81 (2017) 100.
[4] L.M. Qiu et al., Cryogenics 42 (2002) 327.
Keywords: Pulse Tube Cryocooler; Rotary valve; Coolingpower