AdLIGO Bench Testing of Proposed Quad Alignment & Gap Setting Hardware (Keyence)T080201

1. AdLIGO Bench Testing of Proposed Quad Alignment & Gap Setting Hardware (Keyence)T080201 • Two SOS optics were used to represent the Reaction Mass and either the ITM or ETM masses. Optics had 3 degrees of freedom. adLIGO R&D

2. AdLIGO Bench Testing of Proposed Quad Alignment & Gap Setting Hardware (Keyence)T080201 • Keyence CCD displacement measuring heads. Heads come with a target range and a ± working tolerance. Laser output port. CCD Camera adLIGO R&D

3. AdLIGO Bench Testing of Proposed Quad Alignment & Gap Setting Hardware (Keyence)T080201 • The heads propagate a 635nm beam to each of the 4 optic surfaces that reflect back to the CCD camera measuring the displacement. adLIGO R&D

4. AdLIGO Bench Testing of Proposed Quad Alignment & Gap Setting Hardware (Keyence)T080201 • The output values and settings can be set on the controller locally or on a laptop. adLIGO R&D

5. AdLIGO Bench Testing of Proposed Quad Alignment & Gap Setting Hardware (Keyence)T080201 • Laptop settings adLIGO R&D

6. AdLIGO Bench Testing of Proposed Quad Alignment & Gap Setting Hardware (Keyence)T080201 • Laptop grid screen showing the gap and optic thicknesses realtime. GAP measurement shown is the value between the white cursors. Scale was set for 4mm between grids lines adLIGO R&D

7. AdLIGO Bench Testing of Proposed Quad Alignment & Gap Setting Hardware (Keyence)T080201 Beam propagation paths to the optic, reflected back to the CCD camera port adLIGO R&D

8. AdLIGO Bench Testing of Proposed Quad Alignment & Gap Setting Hardware (Keyence)T080201 2.0” by ¼”optics S1 & S2 are parallel < 10 arc seconds. Optic 1 in the test mass dummy is a 50% reflector. Optic 2 in the Reaction mass dummy is a 99% reflector adLIGO R&D

9. OPTICAL AUTOCOLLIMATOR METHOD MONITOR & RETICLE PATTERN AUTO COLLIMATOR 50% BS (TEST MASS) HR (REACTION MASS) adLIGO R&D

10. AdLIGO Bench Testing of Proposed Quad Alignment & Gap Setting Hardware (Keyence)T080201 • Camera view from the autocollimator eyepiece showing a properly aligned reflection. adLIGO R&D

11. AdLIGO Bench Testing of Proposed Quad Alignment & Gap Setting Hardware (Keyence)T080201 Reticle pattern and cross hair as image is retro-reflected +/- 30 minutes scale. Our tolerance for the parallelism is .08 degrees (~0.5mins) so we need to split the space between the tick marks. adLIGO R&D

12. AdLIGO Bench Testing of Proposed Quad Alignment & Gap Setting Hardware (Keyence)T080201 • Reticle pattern shown with optic shifted in pitch’d(up) and yaw’d (right) adLIGO R&D

13. AdLIGO Bench Testing of Proposed Quad Alignment & Gap Setting Hardware (Keyence)T080201 • This demonstrates a typical image when both optics are pitch’d & yaw’d off. adLIGO R&D

14. AdLIGO Bench Testing of Proposed Quad Alignment & Gap Setting Hardware (Keyence)T080201 This image show both optics aligned in yaw, but the second optic is pitched up. adLIGO R&D