The LIGO Interferometer Sensing and Control System

Details The LIGO Interferometer Sensing and Control System The LIGO Interferometer Sensing and Control System

2001-11-07

arxiv.org/abs/physics/0111027v1

eConf C011127 (2001) WEAP060

Physics

Instrumentation and Detectors

3 Pages, 2001 ICALEPCS conference

Scientific paper

The LIGO Interferometer Sensing and Control System (ISC) is a large and highly distributed Multiple Input Multiple Output (MIMO) control system that is used to control the length and alignment degrees of freedom of the interferometers. The 4 kilometer Fabry-Perot cavity lengths are controlled to better than 10-13 meters (rms) and the angular degrees of freedom are controlled to better than 10-8 radians. This paper will describe the real-time digital servo control systems that have been designed, developed and implemented for the LIGO Length Sensing and Control (LSC) [1] and Alignment Sensing and Control (ASC) [2] systems. In addition, the paper will describe how these controls, along with the suspended optic controls [3], have been integrated into the overall LIGO control and data acquisition system [4].

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