Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 54: Poster Session: Cryotechnique
TT 54.7: Poster
Wednesday, March 22, 2017, 15:00–19:00, P2-OG3
4 K Pulse Tube Cryocoolers: Solutions for "Dry" Cooling Applications with High Performance Requirements — •Jack-Andre Schmidt2, Jens Falter1, Bernd Schmidt1,2, Marc Dietrich1,2, 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
Within the family of regenerative cooling systems, Pulse Tube Coolers (PTC) provide long life operation and low vibration due to the absence of moving parts inside the cold head. These advantages make PTC’s the preferable choice for "dry" cryostats of low noise applications, where maintenance of the system is difficult. However, as a consequence of the periodic compression and expansion cycles of the process gas (Helium), they exhibit - as all cryocoolers - an intrinsic mechanical and thermal variation. In contrast to Gifford-McMahon coolers, PTCs are also bound to operate in vertical orientation. Due to these requirements in distinct cases, an adaption of the PTC to the individual cryostat design becomes necessary. Here we present the successful integration of a PTC into a unique cryostat for an airborne infrared telescope for radio astronomy [2]. Minimizing the intrinsic effects of the PTC down to the noise level of the measurement by suitable damping units is discussed as well as the high performance of the PTC, even operated under the tilting angle of the telescope.
[1] G. Thummes et al., Cryogenics, Vol. 38,3, (1998), 337-342
[2] C. Risacher et al., IEEE Trans. on THz Sci. and Tech., Vol. 6, Issue 2 (2015)