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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 on theme: "The Autoalignment System of GEO 600 Hartmut Grote and the GEO 600 team Max-Planck Institute for Gravitational Physics Amaldi, Perth 12-07-2001."— Presentation transcript:

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

2 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)

3 Autoalignment Experimental setup for 1 cavity

4 Autoalignment Experimental setup for 1 cavity

5 Autoalignment Experimental setup for 1 cavity

6 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)

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

8 Autoalignment Experimental setup for 1 cavity Spot position control

9 Autoalignment - Switching On and Off

10 Modecleaner Alignment Drift Over 1 Day

11

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13 Autoalignment setup PR + MI cavity

14 PR Mirror Rotation Autoalignment Errorsignal

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