Achieving resonance in the Advanced LIGO gravitational-wave interferometer
Staley, A.; Martynov, D.; Abbott, Richard; Adhikari, Rana; Arai, Koji; Ballmer, Stefan; Barsotti, L.; Brooks, A. F.; DeRosa, R.; Dwyer, S.; Effler, A.; Evans, M.; Fritschel, Peter; Frolov, V.; Gray, C.; McClelland, David; Miller, John; Mullavey, Adam; Slagmolen, Bram; Ward, Robert
Interferometric gravitational-wave detectors are complex instruments comprised of a Michelson interferometer enhanced by multiple coupled cavities. Active feedback control is required to operate these instruments and keep the cavities locked on resonance. The optical response is highly nonlinear until a good operating point is reached. The linear operating range is between 0.01% and 1% of a fringe for each degree of freedom. The resonance lock has to be achieved in all five degrees of freedom...[Show more]
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