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TT: Fachverband Tiefe Temperaturen
TT 60: Cryogenic Detectors and Sensors, Refrigeration and Thermometry
TT 60.5: Talk
Wednesday, March 20, 2024, 17:00–17:15, H 3025
Tilting of a small scale 4 K pulse tube cryocooler driven by a low input power oil-free Helium compressor — •Jack-Andre Schmidt1,2, Bernd Schmidt1,2, Jens Falter2, Jens Höhne3, Sebastian Schaile4, and André Schirmeisen1,2 — 1Justus-Liebig-Universität Giessen, Giessen, Germany — 2TransMIT GmbH, Giessen, Germany — 3Pressure Wave Systems GmbH — 4attocube systems AG
Among the family of regenerative cryocoolers, GM-type pulse tubes (PTC) in particular stand out because they have no moving mechanical parts at cryogenic temperatures. The working principle of PTCs relies on the cyclic pressure waves of Helium gas at relatively high pressure differences around 1 MPa. These pressure levels are commonly provided by dedicated Helium gas compressors, which represent the main unit of energy consumption in the cryo system with input powers ranging from 1 kW to above 10 kW. Here we present a combination of the smallest so far reported 4 K PTC Susy driven by an oil-free low power compressor technology IGLU achieving cooling powers necessary for typical optical quantum components below 4.2 K. The IGLU compressor is based on a mechanism with hydraulically driven metal bellows, providing minimum maintenance and maximum mobility. This combination reaches the physical minimum temperature of 2.2 K at no load, and a cooling capacity of 240 mW at 4.2K, with the compressor operating at maximum speed at 1.3 kW input power. Additionally we present the results of tilted operation of the whole setup.
Keywords: pulse tube cryocooler; compressor; cooling power; Susy; IGLU