Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 61: Superconductivity: Superconducting Electronics II and Cryotechnique
TT 61.6: Vortrag
Mittwoch, 14. März 2018, 16:30–16:45, H 2053
A small two-stage PTC operating at liquid Helium temperature with 1 kW input power — •Bernd Schmidt1,2, Matthias Vorholzer2, Marc Dietrich1, Jens Falter1, Günter Thummes1,2, and André Schirmeisen1,2 — 1TransMIT-Center for Adaptive Cryotechnology and Sensors, Giessen, Germany — 2Institute of Applied Physics, Justus-Liebig-University Giessen, Germany
Cryocoolers provide temperatures of less than 4 K without the need of liquid Helium. Additionally, the Pulse Tube Cryocooler (PTC) has has no moving parts in the cold part, which leads to lower disturbances.
Many developments of PTCs aim for higher cooling power at 4.2 K (> 1.5 W). However, some applications only need small cooling powers (< 100 mW), but suffer from the intrinsic disturbances of cryocoolers.
In this talk we present a new two-stage GM-type PTC, driven by a commercial Helium compressor with only 1 kW input power. The PTC reaches a minimum temperature of 2.36 K and provides a cooling power of 72 mW at 4.2 K. (1) It was initially designed to cool down SNSPDs and transition-edge bolometers. First measurements with low-noise Nb-SQUIDs were already made. Since the PTC can be easily driven by a portable generator, it is also suitable e.g. for in-field measurements like geophysical studies.
Funding via the BMBF joint project "SUSY" (grant No 13N13444) is gratefully acknowledged.
Cryogenics 88 (2017) 129