Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 20: Cryotechnique & Measuring Devices: Poster Session
TT 20.2: Poster
Montag, 7. März 2016, 15:00–18:00, Poster D
Low-Noise Pulse Tube Cryocooler near 5 K: development of a system for operation of optical detectors — •Matthias Vorholzer1,2, Bernd Schmidt1,2, Jens Falter1, Marc Dietrich1,2, 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
Pulse tube cryocoolers (PTC) are, beside Gifford-McMahon and Stirling-cryocoolers, an option for "dry" cooling down to liquid helium temperatures. A unique feature of the PTC, the absence of a moving displacer in the cold head, reduces the required maintenance compared to other cryocoolers and allows a setup with low mechanical vibrations. While plenty of development aims towards high cooling powers, for many applications cooling powers below 100 mW near 4-5 K are already sufficient for operation.
In the framework of the BMBF joint project "SUSY" (SUperconducting optical sensors based on a compact cryogen-free SYstem platform) we are developing a low-noise 2-stage 5 K PTC for cooling of transition edge bolometers and single-photon detectors with an input power of 1 kW or less. Reducing the vibrations is critical for those sensors and can mainly be achieved by reducing the pressure oscillation and downsizing the cold head. With only 1 kW input power and a considerable reduction in size the oscillatory displacement of the cold head is significantly lowered compared to typical PTC.
Work supported by the German BMBF under grant no. 13N13444