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Publications - Thales Cryogenics

CEC 2005 – Development of the LPT 9510 1 Watt Concentric Pulse Tube

In order to provide cryogenic cooling for applications that are extremely sensitive to mechanical vibration, Thales Cryogenics has been delivering U-shape pulse tube cryocoolers since 2001. The disadvantage of the U-shape design is that the available regenerator volume is too limited if the application puts constrains on the overall diameter of the cold finger, thus limiting the coolers efficiency.  As presented at CEC/ICMC 2003, Thales Cryogenics and CEA/SBT have achieved very good results with a large concentric pulse tube delivering 4W @ 77K driven by a flexure bearing compressor. Furthermore, the same team, together with Air Liquide DTA, developed a very efficient 1W pulse tube cooler for the ESA MPTC project.  Based on the experiences obtained with those programs, Thales Cryogenics and CEA/SBT have now developed a small concentric pulse tube that is driven by a flexure bearing compressor. The result is a very compact and reliable cooler (LPT 9510), with an efficiency that is nearly doubled compared to the U-shape version with the same overall external diameter dimensions.  This paper describes the trade-offs that have been considered in the design phase, and gives a detailed overview of the test results, the status of the qualification program and a comparison with a comparable Stirling cold finger.

J. C. Mullié (1), P. C. Bruins (1), T. Benschop (1), I. Charles (2), A. Coynel (2), L. Duband (2)

(1)THALES Cryogenics, Eindhoven, 5600, the Netherlands

(2)CEA/DSM/DRFMC/Service des Basses Températures Grenoble, 38054, France

CEC 2005 – Development of a Large Heat Lift 40-80 K Pulse Tube Cooler (LPTC) for Space Applications

A Large heat lift 40 to 80 K Pulse Tube Cooler (LPTC) is currently under development in partnership between AL/DTA, CEA/SBT and THALES Cryogenics. The Engineering Model (EM) foreseen is aiming to provide 2 W of cooling capacity at 50 K for 10°C rejection temperature and for 125 watts input power to the compressor’s motors.  Cold finger development models (DM) have been manufactured with an in-line architecture and connected to an off-the-shelf compressor from Thales Cryogenics. The DM results are discussed in the present paper while operating in inertance mode for various PV work and are used to complete the design of the future EM.  In parallel, the compressor motor has been optimized and prototyped. The results have been confronted to the simulated performances and are also discussed herein.  The various trade-offs, performed both on the cold finger and compressor side, during the development phase are presented as well.  This work is funded by the European Space Agency (ESA/ESTEC Contract N°18433/04/NL/AR) in the frame of future Earth Observation instruments development. The LPTC Engineering Model will be delivered to ESA/ESTEC in September 2006.

T. Trollier, J. Tanchon, J. Buquet and A. Ravex (1), I. Charles, E. Flahaut and L. Duband (2),  J. Mullié, J. Dam and T. Benschop (3),  M. Linder and J.L. Bezy (4)

(1) AIR LIQUIDE Advanced Technology Division, AL/DTA Sassenage, 38360, France

(2) CEA/DSM/DRFMC Service des Basses Températures, CEA/SBT. Grenoble, 38054, France

(3) THALES Cryogenics B.V Eindhoven, 5600 HA, The Netherlands

(4) European Space Agency, ESA/ESTEC, Noordwijk, 2200 AG, The Netherlands