1. LIGO-G9900XX-00-M adLIGO R&D1 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.

2. LIGO-G9900XX-00-M adLIGO R&D2 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

3. LIGO-G9900XX-00-M adLIGO R&D3 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.

4. LIGO-G9900XX-00-M adLIGO R&D4 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.

5. LIGO-G9900XX-00-M adLIGO R&D5 AdLIGO Bench Testing of Proposed Quad Alignment & Gap Setting Hardware (Keyence)T080201 Laptop settings

6. LIGO-G9900XX-00-M adLIGO R&D6 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

7. LIGO-G9900XX-00-M adLIGO R&D7 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

8. LIGO-G9900XX-00-M adLIGO R&D8 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

9. LIGO-G9900XX-00-M adLIGO R&D9 50% BS (TEST MASS) HR (REACTION MASS) AUTO COLLIMATOR MONITOR & RETICLE PATTERN OPTICAL AUTOCOLLIMATOR METHOD

10. LIGO-G9900XX-00-M adLIGO R&D10 AdLIGO Bench Testing of Proposed Quad Alignment & Gap Setting Hardware (Keyence)T080201 Camera view from the autocollimator eyepiece showing a properly aligned reflection.

11. LIGO-G9900XX-00-M adLIGO R&D11 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.

12. LIGO-G9900XX-00-M adLIGO R&D12 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)

13. LIGO-G9900XX-00-M adLIGO R&D13 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.

14. LIGO-G9900XX-00-M adLIGO R&D14 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.