2001/11/07 by J. Heefner, R. Bork, R. Abbott
Physics and Astronomy · #physics.ins-det #physics.gen-ph #physics.optics
published as eConf C011127 (2001) WEAP060 · 3 Pages, 2001 ICALEPCS conference
arxiv created 2001/11/07 · arxiv updated 2009/12/01
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].