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Proceedings Paper

Heterodyne instrumentation upgrade at the Caltech Submillimeter Observatory
Author(s): Jacob W. Kooi; Attila Kovacs; Steven M. Kaye; J. Dama; Michael L. Edgar; Jonas Zmuidzinas; Thomas G. Phillips
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Paper Abstract

Under development at the Caltech Submillimeter Observatory is a dual polarization, continuous comparison (correlation) receiver. The instrument has two beams on the sky; a reference and a signal beam. Using only cooled reflecting optics, two polarizing grids, and a quadrature hybrid coupler, the sky beams are coupled to four tunerless SIS mixers (both polarizations). The 4-8 GHz mixer IF outputs are, after amplification, correlated against each other. In principle, this technique results in flat baselines with very low RMS noise and is especially well suited for high redshift Galaxy work. At the same time an upgrade is planned to the existing facility heterodyne instrumentation. Dual frequency mode receivers are under development for the 230/460 GHz and 345/660 GHz atmospheric windows. The higher frequency receivers are implemented in a balanced configuration, which reduces both the LO power requirement and noise. Each mixer has 4 GHz of IF bandwidth and can be controled remotely. Not only do these changes greatly enhance the spectroscopic capabilities of the CSO, they also enable the observatory to be integrated into the Harvard-Smithsonian Submillimeter Array (SMA) as an additional baseline.

Paper Details

Date Published: 17 February 2003
PDF: 14 pages
Proc. SPIE 4855, Millimeter and Submillimeter Detectors for Astronomy, (17 February 2003); doi: 10.1117/12.459114
Show Author Affiliations
Jacob W. Kooi, California Institute of Technology (United States)
Attila Kovacs, California Institute of Technology (United States)
Steven M. Kaye, California Institute of Technology (United States)
J. Dama, California Institute of Technology (United States)
Michael L. Edgar, California Institute of Technology (United States)
Jonas Zmuidzinas, California Institute of Technology (United States)
Thomas G. Phillips, California Institute of Technology (United States)


Published in SPIE Proceedings Vol. 4855:
Millimeter and Submillimeter Detectors for Astronomy
Thomas G. Phillips; Jonas Zmuidzinas, Editor(s)

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