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First results from DesertSTAR: a 7-pixel 345-GHz heterodyne array receiver for the Heinrich Hertz Telescope

Groppi, C. E. and Walker, C. K. and Kulesa, C. and Golish, D. and Hedden, A. and Narayanan, G. and Lichtenberger, A. W. and Kooi, J. and Graf, U. U. and Heyminck, S. (2004) First results from DesertSTAR: a 7-pixel 345-GHz heterodyne array receiver for the Heinrich Hertz Telescope. In: Millimeter and Submillimeter Detectors for Astronomy II. Proceedings of SPIE. No.5498. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, pp. 290-299. ISBN 9780819454300.

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We present the first astronomical results from DesertSTAR, a 7 pixel heterodyne array receiver designed for operation in the astrophysically rich 345 GHz atmospheric window. DesertSTAR was constructed for the 10m Heinrich Hertz Telescope located at 3150m elevation on Mt. Graham, Arizona. This receiver promises to increase mapping speed at the HHT by a factor of ~15 over the facility's existing single beam, dual polarization receiver. DesertSTAR uses tunerless, single-ended waveguide SIS mixers to achieve uncorrected receiver noise temperatures of ~60K. The instantaneous bandwidth is 2 GHz, with a 5 GHz Intermediate Frequency, offering 1600 km/s of velocity coverage. Cryogenic isolators are employed between the mixers and low noise amplifiers to assure a flat IF passband. The system uses a Joule-Thompson closed-cycle refrigerator with 180W capacity at 70K and 1.8W capacity at 4K. A novel reflective phase grating is used for Local Oscillator multiplexing, while a simple Mylar beamsplitter is used as an LO diplexer. Optics include only polyethelene mixer lenses and a single, cold, flat mirror, maximizing simplicity for high efficiency and easy optical alignment. The computer controlled bias system provides low noise bias for the SIS junctions, magnets and LNAs through a modular and hardware independent GUI interface, and allows remote operation and monitoring. We present measurements of receiver noise, beam quality, efficiency and stability in addition to astronomical observations obtained during engineering runs at the HHT.

Item Type:Book Section
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Kooi, J.0000-0002-6610-0384
Additional Information:© 2004 Society of Photo-Optical Instrumentation Engineers.
Subject Keywords:SIS Heterodyne Array Receiver Submillimeter Molecular Spectroscopy
Series Name:Proceedings of SPIE
Issue or Number:5498
Record Number:CaltechAUTHORS:20181219-100037352
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Official Citation:Christopher E. Groppi, Christopher K. Walker, Craig Kulesa, Dathon Golish, Abigail Hedden, Gopal Narayanan, Arthur W. Lichtenberger, Jacob W. Kooi, Urs U. Graf, Stefan Heyminck, "First results from DesertSTAR: a 7-pixel 345-GHz heterodyne array receiver for the Heinrich Hertz Telescope," Proc. SPIE 5498, Millimeter and Submillimeter Detectors for Astronomy II, (8 October 2004); doi: 10.1117/12.552492
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91911
Deposited By: Tony Diaz
Deposited On:19 Dec 2018 18:16
Last Modified:16 Nov 2021 03:45

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