Low-Cost Cryocoolers for the Allen Telescope Array

Details Low-Cost Cryocoolers for the Allen Telescope Array Low-Cost Cryocoolers for the Allen Telescope Array

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..710.1367l&link_type=abstract

ADVANCES IN CRYOGENIC ENGEINEERING: Transactions of the Cryogenic Engineering Conference - CEC. AIP Conference Proceedings, Vol

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Cryogenics, Refrigerators, Low-Temperature Detectors, And Other Low-Temperature Equipment, Radio Telescopes And Instrumentation, Heterodyne Receivers

Scientific paper

We have developed a single-inlet pulse tube refrigerator and clearance-seal compressor which deliver approximately 0.4 W cooling at 80 K for a new radio telescope, the Allen Telescope Array. The array requires approximately 350 refrigerators (one for each antenna), so extremely high reliability and low cost are essential. The refrigerator has a U configuration and is optimized for 60 Hz operation. Two versions, with slightly different pulse tube geometry, have been built and tested to compare the losses associated with the non-adiabatic behavior of the pulse tube. The compressor consists of a single oscillating piston driven by a linear motor. It has a simple design, a very low parts count (which is nearly halved by accepting an unbalanced design), and is optimized for mass production. Due to tight packaging constraints within the antenna feed, the compressor must be separated from the refrigerator. The refrigerator performance is still being optimized, with about 1 W of cooling at 80 K expected for 40 W electrical input power. The system design and refrigerator design and construction were done at NIST, while the compressor was designed and built at U. C. Berkeley.

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