Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2011-06-17
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
3 pages, 2010 Asia-Pacific Radio Science Conference: J2 Millimeter- and Sub-millimeter-wave Telescope and Array
Scientific paper
We report major performance test results of the Atacama Compact Array (ACA) 7-m and 12-m antennas of ALMA (Atacama Large Millimeter/submillimeter Array). The four major performances of the ACA antennas are all-sky pointing (to be not more than 2.0 arcsec), offset pointing (to be < 0.6 arcsec) surface accuracy (< 25(20) micrometer for 12(7)m-antenna), stability of path-length (15 micrometer over 3 min), and high servo capability (6 degrees/s for Azimuth and 3 degrees/s for Elevation). The high performance of the ACA antenna has been extensively evaluated at the Site Erection Facility area at an altitude of about 2900 meters. Test results of pointing performance, surface performance, and fast motion capability are demonstrated.
Iguchi Satoru
Ikenoue Bungo
Inatani Junji
Kato Yoshihiro
Mizuno Norikazu
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