MOONS Cambridge Work Package Status ESO Progress Meeting 24/25 th June 2019

1. MOONS Cambridge Work Package Status ESO Progress Meeting 24/25th June 2019

2. Achievements: Cameras • MOONS camera assembly complete prior to support tests

3. Test status - 1 • Optics displacement test (static) completed • Verifies design parameters and meets requirements on maintaining optical alignment • Impulse testing completed • Earthquake requirements met (optical alignment maintained) • Pre-alignment completed • Mirror and lens on, and normal to, mechanical axis • Dimensional tolerances of mirror and lens are good • Electronics and control completed • Cable harnesses to chamber port completed • Camera wiring almost complete • Some internal chamber wiring to complete

4. Camera Testing - 1 • Optics displacement testing • Precision transducers fitted. • Deflections measured in two axes at two orientations. • Results are consistent with design analysis. • Re-centring of optics is well within requirements and friction is a factor of two lower than calculated worst case. • Alignment requirements shown in blue text left. • Decentre requirement <50 m. • Measured performance: < 20 m. • Lens/Mirror differential: < 6 m. Delta-X/Y (mm) perpendicular to optical path: Whole camera relative to disperser: 1.0 M1 relative to camera assembly: 0.05 L1/L2 relative to camera assembly: 0.05 Delta-Z (mm) along optical path: Whole camera relative to disperser: 1.0 M1 relative to camera assembly: 0.05 L1/L2 relative to camera assembly: 0.05

5. Simulated earthquake testing Impulse testing in X,Y and Z. Mount camera on baseplate fitted with resilient mounts. Accelerometers fitted to baseplate and camera. Monitor vertical and transverse lens and mirror displacements. Apply impulses with soft ram to baseplate in both transverse and axial directions. Tilt and drop camera for vertical impulse direction. Record changes in lens and mirror position and also accelerometer signals. Top: Test arrangement on platform truck. Right: Accelerometer outputs for an impulse left/right. Camera Testing - 2

6. Camera testing -3 • Vertical impulse • Blue (vertical) 2.6g. • Red (horizontal L-R). • Green (optical axis). • Orange is vertical mirror displacement which is -57 m peak and is settling to less than 11 m at > 0.7 seconds. • Primary mode of oscillation is ~6 Hz. • Baseplate mode is ~150 Hz.

7. Pre-alignment • Laser alignment • Equipment: laser, beam splitter, targets and camera. • Test mirror finds vertical. • Set cross hairs over mirror. • Shim camera back to centre return. • Set flexure lengths. • Place lens module. • Examine multiple reflections for centring lens module. • Adjust motors to get lens tilt correct. • Does not provide de-space of optics.

8. Camera test bench All modules mounted on bench except camera Collimator mounted Slit module removed for fibres to be fitted Electronics and control completed Control chassis completed Cable harnesses to chamber port completed Some internal chamber wiring to complete Camera Motor and limits wiring complete Temperature sensor wiring fitted Camera motor limit switches to be set up Test status - 2

9. Camera wiring • Motor wiring and connector allows motor to be removed once alignment is complete. • Permanent wiring for motor connection is installed and runs back to connector interface. • Limit switches and wiring stays in place. • Limit switch wiring is installed and runs back to connector interface. • Temperature sensors are mounted on lens and mirror cells and wired through individual connectors back to interface plate

10. Camera Alignment Final alignment arrangement & detailed assembly MOONS collimator Camera support Thermal bus-bars XYZ mount Fibre slit • Extra-focal images – 9 fieldpositions • Perform analysis – 5 misalignments • Apply corrections to lens module • Repeat to converge • Detailed model of alignment assembly • Note small test camera on the XZY mount • Hartmann screen not shown

11. Camera test facitily - 1 Hartmann screen Test camera X,Y,Z mount

12. Camera Test Facility - 2 Camera mounting plate Collimator location 5-fibre ‘slit’

13. Camera Test Facility - 3

14. Camera Test facility - 4

15. Warm Alignment -1 • Cool-down of test apparatus • Patrol camera motors and test camera checks • Limit switch checks • Test bench assembly completed • Camera test-mounted to support frame • Slit fibres and illumination in preparation • Mechanical slit mount already completed • 5 fibres and IR LEDs in illumination block • Find optimum slit position • Image generation from Zemax files

16. Warm Alignment - 2 • Image shows simulated Hartmann mask image for 600 µm defocus. • Software tasks under preparation: • take a Hartmann mask image, measure spot positions and use data to generate Zemax merit function (MF). • Re-optimise using this merit function and allow the camera optics tilts and decentres to vary. • configuration after re-optimisation then represents the actual misalignments of the camera. • Automate proven process with software to generate the MF and/or running Zemax from a python script • Warm alignment starts next week

17. Current status

18. Summary • Technical: • Test chamber cooled and tested under vacuum. • All camera parts delivered and assembled. • DAM mechanical interface tested. • Test assembled onto bench • Chamber thermal straps installed. • Test electronics complete. • External wiring complete. • Camera assembled with optics. • Camera static and dynamic tests successfully completed. • Camera wiring harness complete. • Warm alignment about to start. • Cold tests start at beginning July. • Camera #2 - #6 parts being machined