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Proceedings Paper

Receiver-beam characterization for the SMA
Author(s): Ming-Tang Chen; C.-Y. E. Tong; Raymond Blundell; D. Cosmo Papa; Scott N. Paine
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Paper Abstract

This paper describes the measurement and subsequent data analysis of the signal beam of the receiver system of the Submillimeter Array (SMA). To measure the receiver beam patterns, a 2-axis planar scanning stage is mounted on top of the receiver assembly. Scanning in a plane orthogonal to the optical path, the near-field measuring system maps out both the amplitude and phase at frequencies of 242 and 265 GHz. By analyzing the measured patterns we can inspect the alignment of an individual receiver, and the optical assembly common to all frequency bands. The data also allows us to determine how the receiver couples to the beam waveguide that feeds the SMA antennas. The measured beam patterns of two different receivers, covering frequency bands of 176 - 256 and 250 - 350 GHz, are presented, as well as the analysis of these data. We believe that this is the first time such a rigorous full vectorial radio alignment technique has been applied to millimeter or submillimeter receiving systems for radio astronomy.

Paper Details

Date Published: 31 July 1998
PDF: 8 pages
Proc. SPIE 3357, Advanced Technology MMW, Radio, and Terahertz Telescopes, (31 July 1998); doi: 10.1117/12.317343
Show Author Affiliations
Ming-Tang Chen, Institute of Astronomy and Astrophysics (Taiwan)
C.-Y. E. Tong, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Raymond Blundell, Harvard-Smithsonian Ctr. for Astrophysics (United States)
D. Cosmo Papa, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Scott N. Paine, Harvard-Smithsonian Ctr. for Astrophysics (United States)

Published in SPIE Proceedings Vol. 3357:
Advanced Technology MMW, Radio, and Terahertz Telescopes
Thomas G. Phillips, Editor(s)

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