LIGO Document T1000022-v4

Viewports Subsystem Requirements Document

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T - Technical notes
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This document will present the design requirements for the Viewports Subsystem. The Viewports subsystem provides optical viewports for the passage of all optical beams in and out of the vacuum region(s) of the IFO. The optical beams include the following: optical lever beams, CO2 laser beams for thermal compensation, chamber illumination beams, video camera beams, and optical beams used for interferometer sensing and control.
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eliminated blank pages
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