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Proceedings Paper

Atacama compact array antennas
Author(s): M. Saito; J. Inatani; K. Nakanishi; H. Saito; S. Iguchi
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Paper 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.

Paper Details

Date Published: 17 September 2012
PDF: 8 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84443H (17 September 2012); doi: 10.1117/12.926987
Show Author Affiliations
M. Saito, National Astronomical Observatory of Japan (Japan)
Joint ALMA Observatory (Chile)
J. Inatani, National Astronomical Observatory of Japan (Japan)
K. Nakanishi, National Astronomical Observatory of Japan (Japan)
Joint ALMA Observatory (Chile)
H. Saito, National Astronomical Observatory of Japan (Japan)
S. Iguchi, National Astronomical Observatory of Japan (Japan)


Published in SPIE Proceedings Vol. 8444:
Ground-based and Airborne Telescopes IV
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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