Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 33: Superconductivity: Cryodedetectors & Cryotechnique
TT 33.6: Vortrag
Dienstag, 8. März 2016, 15:15–15:30, H19
Simulation of a new Compact Low-Noise Pulse Tube Cryocooler for Operation of Superconducting Optical Detectors near 5 K — •Bernd Schmidt1,2, Matthias Vorholzer1,2, Jens Falter1, André Schirmeisen1,2, and Günter Thummes1,2 — 1TransMIT-Center for Adaptive Cryotechnology and Sensors, Giessen, Germany — 2Institute of Applied Physics, Justus-Liebig-University Giessen, Germany
The operation of superconducting optical sensors requires low-noise cooling techniques at temperatures down to 4-5 K, but only needs cooling powers well below 100 mW. Because of the rising l-He prices and even temporary shortage, cryogen-free cooling systems become more and more attractive. Among such dry cooling systems, PTCs, when compared to Stirling- and GM-cryocoolers, have an advantage due to 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. While there are 4 K GM-type PTCs today that operate with a 2 kW helium-compressor and deliver a cooling power of about 250 mW at 4.2 K, we are developing an even smaller two-stage PTC within the framework of the BMBF joint project SUSY for cooling of bolometers and SNSPDs at temperatures near 5 K. The new PTC has an input power of less than 1 kW to reduce the intrinsic vibrations and improve the temperature stability. Numerical simulations of this new PTC show that it will, despite its small size and input power, still provide enough cooling power to operate the sensors.
Work supported by the German BMBF under grant no. 13N13444