Rolf Bork, Osamu Miyakawa, Sihori Sakata, Alexei Ourjoumtsev, Benjamin Abbott, Jay Heefner, Stephen Vass, Alan Weinstein, Robert Ward, Fumiko Kawazoe, Dennis Ugolini, Robert Taylor, Seiji Kawamura, Alexander Ivanov, Peter Fritschel, Michael Smith, Conor Mow-Lowry, Kenneth Strain, Lisa Goggin
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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