Osamu Miyakawa, Seiji Kawamura, Benjamin Abbott, Rolf Bork, Peter Fritschel, Lisa Goggin, Jay Heefner, Alexander Ivanov, Fumiko Kawazoe, Conor Mow-Lowry, Alexei Ourjoumtsev, Sihori Sakata, Michael Smith, Kenneth Strain, Robert Taylor, Dennis Ugolini, Stephen Vass, Robert Ward, Alan Weinstein
KEYWORDS: Demodulation, Interferometers, LIGO, Prototyping, Surface plasmons, Modulation, Mirrors, Scanning electron microscopy, Sensors, Control systems
The LIGO Laboratory 40m prototype interferometer at Caltech is being commissioned to prototype an optical configuration for Advanced LIGO. This optical configuration has to control five length degrees of freedom, and its control topology will be significantly more complicated than any other present interferometers. This paper explains the method of sensing, controls and lock acquisition.
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