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Proceedings Paper

Analysis of two ALMA front-end receiver channels using physical optics
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Paper Abstract

The Atacama Large Millimetre Array will be a single research instrument composed of up to 50 high precision antennas, located at the Chajnantor plain in the district of San Pedro de Atacama, 5000m above sea level. Each ALMA telescope will contain 10 frequency channels/bands, ranging from 30 to 950GHz. Radiation from the secondary reflector is collected to the receivers of each wavelength channel through their accompanying front end optics. We present a full electromagnetic treatment of the front end optics for band 5 (163 - 211 GHz) and band 9 (602 - 720 GHz). A full quasi optical and physical optics analysis of the band 5 front end optics, using the antenna analysis tool, GRASP9 [1] is presented. Potential optimisation for the system is presented, namely a reflector edge taper and a comparison of two surface geometries. A similar analysis of the band 9 system is presented. Full electromagnetic simulations are compared with cold beam pattern measurements made at the Space Research Organisation of the Netherlands [2, 3]. Analysis of the effect of the polarizing grid is presented, with suggested modifications to improve cross polar levels.

Paper Details

Date Published: 14 February 2008
PDF: 11 pages
Proc. SPIE 6893, Terahertz Technology and Applications, 68930D (14 February 2008);
Show Author Affiliations
Mark Whale, National Univ. of Ireland, Maynooth (Ireland)
Massimo Candotti, National Univ. of Ireland, Maynooth (Ireland)
Neil Trappe, National Univ. of Ireland, Maynooth (Ireland)
Anthony Murphy, National Univ. of Ireland, Maynooth (Ireland)
Andrey Baryshev, Space Research Organisation of Netherlands (Netherlands)
Victor Belitsky, Chalmers Univ. of Technology (Sweden)

Published in SPIE Proceedings Vol. 6893:
Terahertz Technology and Applications
Kurt J. Linden; Laurence P. Sadwick, Editor(s)

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