22 July 2014 Design of the optical system for ALMA band 1
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Abstract
This work presents a complete study of the optical system for ALMA band 1, which covers the frequency range from 35 to 50 GHz, with the goal of extending the coverage up to 52GHz. Several options have been explored to comply with the stringent technical specifications, restrictions, and cost constraints. The best solution consists of a corrugated zoned lens, two infrared filters and a spline profiled corrugated horn. The calculated aperture efficiency is better than 75%, while the average noise contribution is lower than 10.3 K. The first prototypes of the system have been constructed and first evaluation results available.
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Nicolás Reyes, Nicolás Reyes, Valeria Tapia, Valeria Tapia, Doug Henke, Doug Henke, Miguel Sanchez-Carrasco, Miguel Sanchez-Carrasco, F. Patricio Mena, F. Patricio Mena, Stéphane M. X. Claude, Stéphane M. X. Claude, Leonardo Bronfman, Leonardo Bronfman, } "Design of the optical system for ALMA band 1", Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 91451W (22 July 2014); doi: 10.1117/12.2055170; https://doi.org/10.1117/12.2055170
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