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

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

13. Autoalignment setup PR + MI cavity

14. PR Mirror Rotation Autoalignment Errorsignal