Stellar Observations Network Group (SONG): SONG in New Mexico

Optical bench mounted on active support system: PFA51507 - 700 mm (27.5“) Active Isolation Frame 900 x 1200mm (36” x 48“). Requires compressed air regulated to 50-100 psi.

External table/shelf for camera pump, computer relay/thermister/watchdog (on DIN rail?)

Power needed for:

1. computer (and monitor for testing)
2. power supply for QHY camera (power to camera is routed through watchdog with relay reset)
3. power for cooling pump
4. power for alignment laser
5. power for LED source
6. power for FPU iodine stage (FPU testing only)
7. power for FPU calibration stage (FPU testing only)
8. power for calibration box (FPU testing only)
9. power for high voltage source (FPU testing only)
10. power for iodine cell temperature controller (FPU testing only)

Ethernet connection needed for spectrograph computer.

USB:

1. USB3 to hub : alignment camera, autocollimator camera, Esatto focuser, Zaber stage (FPU testing only), Atik camera (FPU testing only)
2. USB2 to hub: QHY power relay, QHY thermister, keyboard, mouse
3. USB3 : QHY camera

1. 4×3 foot optical table on vibration isolation legs
2. upper table and legs
   1. input fiber unit
   2. input LED source
   3. 100mm lens assembly
   4. (removable) beam splitter
   5. laser input
   6. (removable) beam splitter
   7. slit viewing camera
   8. right angle unit and 100mm (?) reimaging optics
   9. slit
3. collimating telescope mount, rail with two diagonal mirrors
4. FM1 and mount
5. OAP1 and mount
6. grating and mount and grating mirror and mount
7. FM2 and mount
8. OAP2 and mount
9. FM3 and mount
10. prism and mount
11. camera and mount
12. ESATTO focusser
13. QHY camera
14. liquid cooling system
15. computer and monitor

1. Prepare optical table with acceptable support and sufficient access on all sides (while attempting to minimize total footprint
   1. position legs
   2. put table on legs
   3. connect compressed air (50-100 psi)
   4. adjust valve on leg D to get ~9mm clearance from bottom of table to leg structure (takes a few minutes for air to raise table)
   5. ajust valves on legs C and B to get level table
2. Mark optical table with locations of mounts based on lab measurements
3. Install collimating telescope behind table.
   1. install laser for collimator mirror alignment at far corner of table
   2. adjust laser to ensure correct height and (175mm?) light parallel to table. Use pentaprism to get long baseline measurement of beam height at ~2 table lengths with reflection, Laser to pentaprism on top of tube with 1-inch circular mirror at bottom, then light comes back up and back towards laser: rotate pentaprism slightly to measure height with measuring stick.
   3. Adjust diagonal mirrors to ensure proper alignment
      1. far diagonal tip-tilt to retun laser back to source
      2. rotate far diagonal to direct towards diagonal under collimator
      3. adjust diagonal under collimator to get beam in collimator.
4. set up upper table on main optical bench in correct location. Install:
   1. fiber input,
   2. collimating assembly. Check with auto-collimator.
   3. laser input via removable beam splitter,
   4. camera output via removable beam splitter, Check with auto-collimator?
   5. output focusing lens.
   6. Check alignment with laser, ensure camera functionality. Install slit to ensure focal plane is at desired height above optical table
5. Install FM1 at desired height. Position to get desired deflection angle
6. Install grating mirror and align with collimating telescope
7. Install FM2 and align with collimating telescope (do now to ensure consistency with grating mirror)
8. Install FM3 and align with collimating telescope (do now to ensure consistency with grating mirror)
9. Install OAP1. Adjust initial height and tilt using autocollimator off mirror on back of mount. Adjust lateral so laser falls at appropriate location on the OAP (52mm from edge?).
10. Align OAP1 using 10micron fiber input to minimize aberration
11. Rotate spectrograph mirror to get 15mm separation between input and output laser. Adjust further to ensure that reflected beam misses FM1.
12. Install OAP2. Adjust initial height and tilt using autocollimator off mirror on back of mount. Adjust lateral so laser falls at appropriate location on the OAP.
13. Rotate FM3 so that return beam goes back into camera.
14. Align OAP2 using 10 micron fiber input to minimize aberration
15. Install prism. Rotate FM3 to ensure correct beam location
16. Install camera. Adjust to ensure correct beam location: no light falling outside any optic
17. Image cross-disperser fiber. Ensure expected width. Adjust detector to make vertical spectrum. Rough prism adjustment to get laser at correct location on detector.
18. Install grating.
19. Adjust grating tilt and prism to ensure good spectral coverage: grating so that peak of blaze function near center of detector, and prism to ensure good wavelength coverage.