Atacama Compact Array Antennas

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) sur...

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Bibliographic Details
Published in:arXiv.org 2011-06
Main Authors: Saito, Masao, Inatani, Junji, Nakanishi, Kouichiro, Naoi, Takahiro, Yamada, Masumi, Saito, Hiro, Bungo Ikenoue, Kato, Yoshihiro, Kou-ichiro Morita, Mizuno, Norikazu, Iguchi, Satoru
Format: Article
Language:English
Subjects:
Antenna arrays
Antennas
Elevation
Measuring instruments
Performance tests
Radio telescopes
Online Access:Get full text
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1106.3472