Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Superconductivity: Cryodetectors
TT 6.9: Vortrag
Montag, 16. März 2015, 11:45–12:00, H 2053
Development of a Compact Low-Noise Pulse Tube Cryocooler for Operation of Superconducting Optical Detectors near 5 K — •Bernd Schmidt1,2, Jens Falter1, André Schirmeisen1,2, and Günter Thummes1,2 — 1TransMIT-Center for Adaptive Cryotechnology and Sensors, Giessen, Germany — 2Institute of Applied Physics (IAP), Justus-Liebig-University Giessen, Germany
The advantage of pulse tube cryocoolers (PTCs), when compared to Stirling- and Gifford-McMahon-coolers, is the absence of a cold moving displacer. This unique feature leads to a low level of mechanical vibrations, lower EMI, and increased reliability of the cold head. Therefore, two-stage PTCs are becoming more and more attractive for cryogen-free cooling at liquid-helium temperatures. The trend in the development of PTCs is towards high cooling powers, which reach up to more than 1 W at 4.2 K. However, the operation of many cryoelectronic devices requires only cooling powers well below 100 mW near 4-5 K. To date, the smallest 4 K PTC on the market operates with a 2 kW helium-compressor and delivers a cooling power of 250 mW at 4.2 K (TransMIT GmbH, model PTD4200). Within the new BMBF joint project "SUSY", we started the development of an even smaller two-stage PTC for cooling of superconducting IR-detectors at temperatures near 5 K. The compressor input power of this new cooler will be approx. 1 kW, significantly reducing the intrinsic residual vibrations of the cold head that result from the pressure-induced "breathing". The lower pressure oscillation will also improve the temperature stability. Work supported by the German BMBF under grant no. 13N13444