Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasj...55..519y&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.55, No.2, pp. 519-525
Astronomy and Astrophysics
Astronomy
10
Instrumentation: Detectors, Radio Astronomy
Scientific paper
We developed a cryogenic system, which houses 3 cartridge-type superconductor-insulator-superconductor receivers for millimeter and submillimeter wavelengths. Since it was designed as a prototype receiver of the Atacama Large Millimeter/submillimeter Array (ALMA), high stability, accurate alignment, and easy handling were required. To meet these requirements, the cryogenic system included the following technologies: 1) a thermal link without screws for receiver cartridges; 2) a central support structure to reduce vacuum and gravitational deformation; 3) bellows structures to reduce mechanical vibration of the cryocooler; and 4) a 3-stage Gifford McMahon (GM) cryocooler with an He pot (temperature stabilizer) to reduce the thermal ripple. The cryostat and receiver cartridges are composed of three stages. The temperatures on the 4K, 12K, and 100K stages of the cartridge are 3.5K, 13.4K, and 78.3K, respectively. The thermal conductances of the thermal links showed high performances of 1.7 W K-1 at the 4K stage, 5.6 W K-1 at the 12K stage, and 3.3 W K-1 at the 100K stage.The mechanical vibration on the 4K stage of the cartridge was reduced to one-tenth, as small as ≈ 2 μm peak-to-peak, compared to that on the 4K coldhead of the cryocooler, ≈ 20 μm peak-to-peak. The temperature ripple on the cartridge was reduced to as small as 2mK peak-to-peak, which corresponds to one-seventh of the ripple on the 4K coldhead with an He pot.
Kambe Toshiaki
Kimura Kimihiro
Narasaki Katsuhiro
Nishino Tetsuo
Noda Kazufusa
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