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Proceedings Paper

ALMA test interferometer control system: past experiences and future developments
Author(s): Ralph G. Marson; Martin Pokorny; Jeff Kern; Fritz Stauffer; Alain Perrigouard; Birger Gustafsson; Ken Ramey
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Paper Abstract

The Atacama Large Millimeter Array (ALMA) will, when it is completed in 2012, be the world's largest millimeter & sub-millimeter radio telescope. It will consist of 64 antennas, each one 12 meters in diameter, connected as an interferometer. The ALMA Test Interferometer Control System (TICS) was developed as a prototype for the ALMA control system. Its initial task was to provide sufficient functionality for the evaluation of the prototype antennas. The main antenna evaluation tasks include surface measurements via holography and pointing accuracy, measured at both optical and millimeter wavelengths. In this paper we will present the design of TICS, which is a distributed computing environment. In the test facility there are four computers: three real-time computers running VxWorks (one on each antenna and a central one) and a master computer running Linux. These computers communicate via Ethernet, and each of the real-time computers is connected to the hardware devices via an extension of the CAN bus. We will also discuss our experience with this system and outline changes we are making in light of our experiences.

Paper Details

Date Published: 15 September 2004
PDF: 9 pages
Proc. SPIE 5496, Advanced Software, Control, and Communication Systems for Astronomy, (15 September 2004); doi: 10.1117/12.552359
Show Author Affiliations
Ralph G. Marson, National Radio Astronomy Observatory (United States)
Martin Pokorny, National Radio Astronomy Observatory (United States)
Jeff Kern, National Radio Astronomy Observatory (United States)
Fritz Stauffer, National Radio Astronomy Observatory (United States)
Alain Perrigouard, Instituto de Radio Astronomia Milimetrica (France)
Birger Gustafsson, European Southern Observatory (Germany)
Ken Ramey, National Radio Astronomy Observatory (United States)

Published in SPIE Proceedings Vol. 5496:
Advanced Software, Control, and Communication Systems for Astronomy
Hilton Lewis; Gianni Raffi, Editor(s)

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