Regensburg 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 20: Cryotechnique & Measuring Devices: Poster Session
TT 20.1: Poster
Montag, 7. März 2016, 15:00–18:00, Poster D
Pulse Tube Cryocoolers: Solutions for "Dry" Cooling of Low Noise Applications at 4 K — •Jens Falter1, Bernd Schmidt1,2, Andreas Euler1, 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
Among the family of regenerative cryocoolers, Pulse Tube Coolers (PTCs) distinguish themselves from Gifford-McMahon- or Stirling coolers by the absence of cold moving parts inside the cold head. This features a long live operation with low vibration of the PTC and less maintenance compared to conventional cryocoolers - making them attractive for low noise applications. Since their invention, 4 K PTCs [1] have become an excellent alternative for "dry" cooling of cryogenic experiments without liquid helium ("wet") even below 4 K. Besides their advantages, PTCs - like all other regenerative cryocoolers - suffer from two intrinsic effects due to the periodic compression and expanding cycles in the cold head: a periodic elastic deformation ("breathing") of the thin walled pulse- and regenerator-tubes, which leads to residual vibrations and a periodic variation in temperature. Here we present unique applications of double-staged 4 K PTC based cryostats. By adapting the cooling power to the requirement of the experiment, the intrinsic effects of the PTC are minimized. Further decoupling and damping of the mechanical and thermal variations provide an excellent environment even for cooling of sensitive devices.
[1] G. Thummes, C. Wang, C. Heiden, Cryogenics 38, 337 (1998)