LIGO Document T1400509-v1

Optimization of Michelson Interferometer Signals in Crackle Noise Detection

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T - Technical notes
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The search for crackle noise has been limited by the presence of various sources of noise, including laser frequency noise, laser intensity noise and the misalignment of end mirrors in the Michelson interferometer. We developed an optimization algorithm that finds the best parameters that minimize the coupling of these noises into the output. These parameters include microscopic length difference, macroscopic length difference of Michelson arms, and the angular alignment of end mirrors.
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