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Heterodyne Instrumentation Upgrade at the Caltech Submillimeter Observatory

Kooi, J. W. and Kovács, A. and Kaye, S. and Dama, J. and Edgar, M. L. and Zmuidzinas, J. and Phillips, T. G. (2003) Heterodyne Instrumentation Upgrade at the Caltech Submillimeter Observatory. In: Millimeter and Submillimeter Detectors for Astronomy. Proceedings of SPIE. No.4855. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 265-278. ISBN 9780819446343.

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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.

Item Type:Book Section
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Kooi, J. W.0000-0002-6610-0384
Additional Information:© 2003 Society of Photo-Optical Instrumentation Engineers (SPIE). We wish to thank Sander Weinreb of JPL for very helpful discussions on “one-sided” waveguide probes. This work was supported in part by NSF Grant# AST-9980846.
Funding AgencyGrant Number
Subject Keywords:Radial probe, full-height waveguide to thin-film microstrip transition, split-block, superconducting-insulating-superconducting (SIS) tunnel junction, broad bandwidth quadrature waveguide hybrid, DC-break, IF match
Series Name:Proceedings of SPIE
Issue or Number:4855
Record Number:CaltechAUTHORS:20180801-133517561
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Official Citation:Jacob W. Kooi, Attila Kovacs, Steven M. Kaye, J. Dama, Michael L. Edgar, Jonas Zmuidzinas, Thomas G. Phillips, "Heterodyne Instrumentation Upgrade at the Caltech Submillimeter Observatory", Proc. SPIE 4855, Millimeter and Submillimeter Detectors for Astronomy, (17 February 2003); doi: 10.1117/12.459114;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88468
Deposited By: George Porter
Deposited On:01 Aug 2018 21:07
Last Modified:16 Nov 2021 00:27

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