Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 29: Poster Session: Cryogenic Particle Detectors and Cyotechnique
TT 29.12: Poster
Montag, 12. März 2018, 15:00–19:00, Poster B
Applications for "Dry" Cooling with damped two-stage Pulse Tube Cryocoolers at their low temperature limit — •Jack-André Schmidt1,2, Jens Falter1, Bernd Schmidt1,2, Günther Thummes1,2, and André Schirmeisen1,2 — 1TransMIT-Center for Adaptive Cryotechnology and Sensors, Giessen, Germany, — 2Institute of Applied Physics (IAP), Justus-Liebig-University Giessen, Germany
Today’s scientific research often requires cooling systems that provide low background noise and high cooling performance. Pulse Tube Cryocoolers (PTC) [1] fulfill these requirements and combine them with a regenerative system for long time measurements. PTCs are a preferable choice of "dry" cryostats because of the absence of moving parts inside the cold head.
PTCs are filled with a working gas (Helium), which is compressed and expanded in cycles of about 1-2 Hz. This induces intrinsic mechanical and thermal variation in all systems with cryocoolers. As a consequence the adaptation of PTCs to sensitive equipment is a complex procedure and needs intricate techniques for thermal as well as mechanical damping. In this work we present the intrinsic variations of PTCs with strategies to minimize the influence on delicate equipment for long time measurements [2]. Different temperature and vibration damping units and cryostat designs are discussed, together with a presentation of the cooling performance of PTCs working under these conditions.
G. Thummes, Cryogenics, Vol. 38, (1998) 337
R. Schrödel et al., Meas. Sci. Technol. 23 (2012) 094004