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Publications - Thales Cryogenics

ICC 2016 – LPT9310 COTS cooler for ECOSTRESS

For the past years, a significant effort has been performed at the Jet Propulsion Laboratory to characterize commercial-off-the-shelf (COTS) Pulse-tube cryocoolers for use in cost-effective spaceflight applications. This has resulted in the selection of the Thales LPT9310 cryocooler for the ECOSTRESS instrument that will fly on the Japanese Experiment Module – Exposed Facility (JEM-EF) of the International Space Station. The Thales LPT9310 cryocooler nominally provides over 4 W of cooling capacity at 80 K, and has been produced in large quantities with a proven capability of multi-year continuous operation without any instances of cooler failure.  However, this capability has only been proven in terrestrial (commercial) applications. In order to provide sufficient justification for using an off-the-shelf cooler for a flight application, additional tests have been performed on the delivered flight coolers, to attain a sufficiently controlled level of quality while leveraging the heritage of the COTS cooler. The test program philosophy will be explained, and results will be discussed. Restrictions in both the available electrical power and the heat exchanger fluid inlet temperature to the instruments onboard the JEM-EF eroded the performance margin book kept for the cryocoolers, prompting the need to find more efficient operating cryocoolers.  Thales Cryogenics responded with an upgrade to the LPT9310, replacing the stainless steel pulse tube with titanium alloy, and a re-optimization of the regenerator matrix for 60K while leaving the baseline, qualified design parameters intact. The resulting performance enhancement from the additional cryocooler efficiency at lower temperatures will be presented.

Ecostress

 

 

 

 

 

 

 

 

 

 

R. Arts, J. Mullié, D. Johnson (1), I. McKinley (1), J. Rodriguez (1), T. Benschop.

Thales Cryogenics B.V., Eindhoven, The Netherlands

(1) Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA

ICC 2016 – LPT6510 Pulse-tube Cooler for 60-150 K applications

For a number of future instruments, such as the OCO-3 instrument, there is an anticipated need for a high-efficiency, small-scale pulse-tube cryocooler for the 60-150 K operating regime.  The LPT6510 cryocooler, based on the Thales Cryogenics MPTC compressor originally developed under ESA TRP and the Absolut System SSC80 pulse-tube cold finger, was designed to fill this niche in an elegant manner. In this paper, an update is given regarding the ongoing development on this cryocooler. Key performance data as well as an overview of the MAIT processes as compared to the LPTC compressor heritage is shown. A novel new design for the buffer-inertance assembly will be presented. The presentation will conclude with a discussion on various integration aspects. This will include the heat sink and mounting design as well as the induced vibration characteristics of this cooler when operated with and without active vibration control.

LPT6510

 

 

 

 

 

 

 

R. Arts, J. Mullié, J. Tanchon1, T. Trollier1.
Thales Cryogenics B.V.,  Eindhoven, The Netherlands 1Absolut System SAS, Seyssinet-Pariset, France

ICC 2016 – Miniature Stirling cryocoolers at Thales Cryogenics: Qualification results and integration solutions

In 2015, Thales Cryogenics has presented new miniature cryocoolers and cooler drive electronics for high operating temperatures (HOT). In this paper, an update is given regarding the qualification program performed on these new products. Integration aspects are discussed, including an examination of the influence of the dewar cold finger on sizing and performance of the cryocooler.  The UP8197 and UP8497 and the corresponding cooler drive electronics will be placed in the reference frame of the Thales product range of high-reliability linear cryocoolers. Compatibility of the cryocoolers design with new and existing ¼” dewar designs is examined, and potential future developments are presented.

UP8197

 

 

 

 

D. Willems, R. Arts, G. de Jonge, J. Mullié, T. Benschop
Thales Cryogenics BV, Eindhoven, The Netherlands