The Autoalignment System of GEO 600 Hartmut Grote and the GEO 600 team Max-Planck Institute for Gravitational Physics Amaldi, Perth 12-07-2001.

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Presentation transcript:

The Autoalignment System of GEO 600 Hartmut Grote and the GEO 600 team Max-Planck Institute for Gravitational Physics Amaldi, Perth

Autoalignment - Purposes Superimpose cavity axes with incoming beam - Differential wavefront sensing (analog feedback for 14 DOF) Center beam spot positions on mirrors - Spot position sensing (digital feedback for 20 DOF)

Autoalignment Experimental setup for 1 cavity

Autoalignment Experimental setup for 1 cavity

Autoalignment Experimental setup for 1 cavity

Autoalignment Experimental setup for 1 cavity Differential wavefront sensing Orthogonalization < 1/10 Bandwith 0.2 or 6 Hz Sensitivity typ. 10 p rad / sqrt(Hz)

Autoalignment Experimental setup for 1 cavity Local beam centering servos Bandwith ~ 1kHz

Autoalignment Experimental setup for 1 cavity Spot position control

Autoalignment - Switching On and Off

Modecleaner Alignment Drift Over 1 Day

Autoalignment setup PR + MI cavity

PR Mirror Rotation Autoalignment Errorsignal

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