ABSTRACT
ICALEPCS 2001

Abstracts



TUBI001 (Invited)

Presenter: Rolf Bork (California Institute of Technology)
email: rolf@ligo.caltech.edu
Review Status: Proceedings Ready - 12/14/01
FullText: pdf
Eprint: physics/0111077

An Overview of the LIGO Control and Data Acquisition Systems{*}

R. Bork, R. Abbott, D. Barker, J.W. Heefner (CIT)

The LIGO Control and Data System (CDS) features a tightly coupled and highly integrated control and data acquisition system. Control of the interferometers requires many Multiple Input Multiple Output (MIMO) control loops closed both locally and across the 4 Km interferometer arm lengths. In addition to providing the closed loop control, the control systems front end processors act as Data Collection Units (DCU) for the data acquisition system. Data collected by these front ends and the data acquisition system must be collected and time stamped to an accuracy of 1 microsecond and is made available to on-line analysis tools such as the Global Diagnostics System (GDS)[1]. Data is also sent to the LIGO Data Analysis System (LDAS) [2] for long-term storage and off-line analysis. Data rates exceed 5 Mbytes per second per interferometer continuous. Connection between the various front end processors and the data acquisition system is achieved using fiber optic reflective memory networks. Both control and data acquisition systems use VME hardware and VxWorks operating systems. This paper will present an overview of the LIGO Control and Data System and discuss key aspects of its design and an outline of the improvements that are currently planned.
[1] D. Sigg, R. Bork, J. Zweizig, 'Detector Characterization and Global Diagnostics System of the Laser Interferometer Gravitational-wave Observatory, Conference proceedings of the Ninth Marcel Grossman Meeting, July 2000.
[2] K. Blackburn, 'Advances in Physics, Electronics, and Signal Processing Applications, World Scientific and Engineering Society Press, 41-46 (2000).
{*} Work supported by the National Science Foundation
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ICALEPCS 2001

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