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Proceedings Paper

Desert STAR: a 7-pixel 345-GHz heterodyne array receiver for the Heinrich Hertz Telescope
Author(s): Christopher E. Groppi; Christopher K. Walker; Craig Kulesa; Dathon Golish; Abigail S. Hedden; P. Gensheimer; Gopal Narayanan; Arthur W. Lichtenberger; Urs U. Graf; Stefan Heyminck
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Paper Abstract

DesertSTAR is a 7 beam, 345 GHz heterodyne array receiver for the Heinrich Hertz Telescope (HHT) on Mt. Graham, AZ. The instrument uses fixed-backshort Superconductor-Insulator-Superconductor (SIS) mixers with a broadband waveguide probe. Instantaneous bandwidths greater than 2 GHz can be achieved over the entire 345 GHz atmospheric window. A cryostat with a Joule-Thompson (JT) mechanical refrigerator allows continuous operation and 1.8W of cooling capacity at 4K, and provides the needed temperature stability for low-noise operation. Local Oscillator (LO) distribution is accomplished with a novel phase grating that yields high efficiency and power uniformity in a hexagonally symmetric geometry. The computer controlled bias system is an evolution of a proven design that is simple and portable to any computer platform. The 2 GHz Intermediate Frequency (IF) bandwidth allows the future addition of a wideband backend optimized for extragalactic observations, with ~1700 km/s of velocity coverage. We present measurements of receiver performance and plans for integration on the HHT.

Paper Details

Date Published: 17 February 2003
PDF: 8 pages
Proc. SPIE 4855, Millimeter and Submillimeter Detectors for Astronomy, (17 February 2003); doi: 10.1117/12.459361
Show Author Affiliations
Christopher E. Groppi, Steward Observatory/Univ. of Arizona (United States)
Christopher K. Walker, Steward Observatory/Univ. of Arizona (United States)
Craig Kulesa, Steward Observatory/Univ. of Arizona (United States)
Dathon Golish, Steward Observatory/Univ. of Arizona (United States)
Abigail S. Hedden, Steward Observatory/Univ. of Arizona (United States)
P. Gensheimer, Univ. of Arizona (United States)
Gopal Narayanan, Univ. of Massachusetts/Amherst (United States)
Arthur W. Lichtenberger, Univ. of Virginia (United States)
Urs U. Graf, Univ. zu Koeln (Germany)
Stefan Heyminck, Univ. zu Koeln (Germany)


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

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