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Aaron Roodman, 10/09/2014 03:15 AM


Observing Plan for the October 10-11, 2014 Engineering Nights

(Late) Afternoon

Night

Primary mirror tests

Active Optics Reference Mesh Test

This is a test of new AOS Reference Meshes and corresponding new Hexapod LUT. In brief, the new reference meshes should yield improved wavefront, and correspond to an overall adjustment of the hexapod "set-point". The change in hexapod value (New-Old, as corrections) correspond to

dx: -838 microns
dy: 1269 microns
xt: -26.5"
yt: 11.7"

More details on the new Meshes can be found here, along with predictions for the kind of IQ improvements.

Test instructions:

Nominal
  • point telescope where there is a reasonable density of stars
  • take r band, 30 second exposures
  • AOS on, LUT on, take 10 exposures to let AOS reach an equilibrium
  • adjust focus TRIM +1500 from current values, leave other TRIM values as-is, turn AOS off, leave LUT on
  • take 5 exposures (measure of wavefront with nominal reference mesh)
  • adjust focus TRIM back to in-focus value
New Reference Meshes & LUT
  • install new AOS reference meshes & Hexapod LUT, using Kevin's script. The script

~DECamObserver/ExposureScripts/Engineering/engineering_20141010/aos.sh

must be run once logged in as user "sispi" and then again as user "codemanager"
  • restart SISPI
  • take r band, 30 second exposures
  • turn AOS on, LUT on, take 20 exposures to let AOS reach an equilibrium
  • if this looks reasonable, then continue as below...
  • adjust focus TRIM +1500 from current values, leave other TRIM values as-is, turn AOS off, leave LUT on
  • take 5 exposures (measure of wavefront with new reference mesh)
  • adjust focus TRIM back to in-focus value
Restore original meshes & LUT
  • to restore original AOS reference meshes & Hexapod LUT, run the script with the --undo option, as:

~DECamObserver/ExposureScripts/Engineering/engineering_20141010/aos.sh --undo

  • take r band, 30 second exposures
  • turn AOS on, LUT on, take 10 exposures to to check that things are restored.

Mamacs and Primary LUT (Aaron and CTIO to update)