Abstract PLANCK is an ESA-led mission to map the cosmic microwave background using bolometric and heterodyne instruments; both instruments require cooling, one to ∼20K, the other to 0.1K. JPL is developing a sorption-based hydrogen cooler to provide 18–20 K cooling to the two instruments. The system mass and power limitations require tradeoffs in thermal design. To demonstrate achievement of an acceptable design, three compressor elements of a flight-like configuration have been built and are undergoing characterization and life tests. The compressor elements utilize a La 1.01 Ni 4.78 Sn 0.22 alloy for reversible hydrogen storage, resistive heaters, and an aluminum foam matrix for thermal uniformity, all contained within a high-pressure vessel. A gas-gap switch provides adjustable thermal isolation. Initial results indicate that hydriding alloy bulk and surface contamination levels are insignificant, and that reversible storage capability is near theoretical limits. We report on static and dynamic thermal characteristics of the compressor elements, and gas supply characteristics related to operational modes of a cooler. We then indicate what further characterization will be performed.
PLANCK Sorption Cooler Initial Compressor Element Performance Tests
Cryocoolers 11 ; 531-540
2002-01-01
10 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
PLANCK Sorption Cooler Initial Compressor Element Performance Tests
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