At the University of Twente, a breadboard 4.5 K sorption cooler was developed under ESA contract. It has no moving parts and, therefore, is essentially vibration-free. Moreover, it has the potential of a very long life. This cooler is a favorite option for missions such as ESA's Darwin mission, which is a future space interferometer consisting of a few free flying telescopes and a central beam combiner. Because of the optics involved, hardly any vibration can be tolerated. The cooler consists of a hydrogen stage cooling from 80 K to 14.5 K and a helium stage establishing 10 mW at 4.5 K. Both stages use micro-porous activated carbon as the adsorption material. The two cooler stages need 8 W of input power and are heat sunk at two passive radiators at temperatures of about 50 and 80 K. We developed and built a demonstrator of the helium stage. In the paper, the design, realization and tests of this demonstrator cooler are reviewed.
|Publication status||Published - 16 Jul 2008|
|Event||2007 Cryogenic Engineering Conference and International Cryogenic Materials Conference, CEC/ICMC 2007 - Chattanooga Convention Center, Chattanooga, United States|
Duration: 16 Jul 2007 → 20 Jul 2007
|Conference||2007 Cryogenic Engineering Conference and International Cryogenic Materials Conference, CEC/ICMC 2007|
|Period||16/07/07 → 20/07/07|