17 September 2012 Atacama compact array antennas
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Abstract
The ACA (Atacama Compact Array) system is an important element of ALMA and consists of four ACA 12-m antennas and twelve ACA 7-m antennas. The ACA system aims to acquire the total power data with four 12-m antennas and the short baseline interferometer data with 7-m antennas. The ACA system also increases reliability of the interferometer maps of astronomical sources larger than the field view of the 12-m antenna. The science performance of these antennas has been extensively verified at OSF (operation support facility) at an elevation of 2900 m in Atacama desert in northern Chile since 2007. The pointing performance has been verified with a dedicated optical pointing telescope, the servo performance is tested with angle encoders, and the surface accuracy has been measured with a radio holography method. Both ACA 12-m antennas and 7-m antennas have been successfully demonstrated to meet the very stringent ALMA specifications.
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M. Saito, M. Saito, J. Inatani, J. Inatani, K. Nakanishi, K. Nakanishi, H. Saito, H. Saito, S. Iguchi, S. Iguchi, } "Atacama compact array antennas", Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84443H (17 September 2012); doi: 10.1117/12.926987; https://doi.org/10.1117/12.926987
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