Template LUCIFER Recalibration after Installation on the Telescope

LUCI checkout after MOS grabber unit service, April 2013

Executive Summary Block
DAYTIME (Closed Dome) Tests . . . . . . . . . . . . .
Test Status
LUCI1 reinstallation on telescope pending
MOS functional checkout pending
Other general function tests pending
Field centering and Pupil alignment pending
FlexComp - Verify pending
Grating Tilt (Lambda-V) Verify pending

NIGHTTIME (On Sky) Tests . . . . . . . . . . .
Test Status Test Status
Twilight Flats (IFF photometric) pending
Find Center of Rotation pending
Verification of AGw transform pending

On-telescope day-time (closed dome) calibrations:

LUCI1 re-installation on telescope. Duration 1.0d
Once done, the following are prerequisites before continuing with the recalibrations
  • Verify MOS GUI to make sure masks are locked!
  • Wait for LUCI to return to thermal equilibrium - Detector stable @77K (verify)
  • Switch on ROE, wait until stable (= time ROE was off, max 2hr)
  • Temps and pressures all look nominal

MOS tests Duration: 4h
Responsible: PB
Telescope: @Zenith, Rotator enabled, Lights can be ON

> Basic MOS checkout:
Tests not detailed. Peter's steps to complete the MOS checkout should be documented for future reference.

 #############################################################################
 # Once the MOS tests have been completed (and passed!) and both Walter and  #
 # Peter have given their OKs to continue, you can use the main instrument   #
 # GUI for all remaining tests.  Be sure to start the telescope service in   #
 # the LUCI SW control GUI manually.                                         #
 #############################################################################

General function tests Duration: 4h
Comments: Use ONLY engineering panels, Main Instrument GUI only usable AFTER Peter has checked the MOS
Telescope: @Zenith, Rotator enabled, Lights can be ON

> Basic instrument function tests:
  • Stop SW / Re-start SW (optional, restarted in move to telescope)
  • Repeat at ROT ~ 341, 221, 101 degrees the following:
    • Camera Wheel: Init; move several times between N1.80 & N3.75 camera
    • FW 1 & 2: init, move both wheels front/backwards movements
    • Grating Unit: init, select all gratings/mirror
    • Grating Tilt: set voltages 0V, +-1V
    • Detector focus: move steps to reach neglim & poslim, note # of steps
    • PV: init and move in/out

Field centering and Pupil alignment Duration: 2h
Telescope: @Zenith, Rotator enabled
LUCI: Imaging, N3.75, K band

> Field centering procedure using FM4
  • Take an image and save it
  • Measure gaps at edges of image
  • FM4: move the mirror in steps to center, notes:
    • Enlarge CompensationMirrorGUI to full screen, use right side of it.
    • M1 -> y, M2-> x; + x steps -> moves image to the right, +y to the top
    • 100 steps corresponds to approximately to 1pix
  • Take images with both cameras, verify centering

> Pupil alignment procedure:
  • Take image to show present alignment of the pupil
  • Adjust FM1 + FM4 (WS: document procedure for future reference)?
  • Repeat until alignment is acceptable

Flexure Compensation - verification data Duration: 2h
Telescope: EL and Rotator enabled, Lights OFF in dome
LUCI: Calib unit in beam (OK for imaging too, same temp as dome)
Scripts located in /home/observer/LBTO/FlexComp_Verify/
Comment: Verification, only a subset needed
Prereq: Flexure calibrations in place, flexure compensation ON!

> Flexure compensation verification:
  • MANUALLY TURN FLEXURE COMPENSATION ON to verify FC!
  • MCS GUI -> ROTATORS -> MOTION CONTROL, set max speed to 1 deg/sec
  • Set EL, send LUCI rotator to -69 degrees to start
  • Best sequence:
    • one config
    • all ROT positions (script does this, ROT starts/ends @ -69d)
    • 2 EL's: 38 and 72 degrees (mid-points of measurements)
    • next config
  • Process data following ~/LBTO/Flexures/FlexureCheck_Luci1.pdf
  • Copy results files into ~/LBTO/Flexures/FlexComp_Verify
  • MCS GUI -> ROTATORS -> MOTION CONTROL, set max speed to 5 deg/sec
  • Send resulting data to Walter

Camera Filter Grating Mask Lamp Script Name
N3.75 clear K Mirror Spectro Sieve Thermal FC_N375_mirror.cal

Turn on Ar lamp manually!

Camera Filter Grating Mask Lamp Script Name
N1.80 HKspec 200_H+K Spectro Sieve Ar FC_N180_200HK.cal
N1.80 clear J 210_zJHK Spectro Sieve Ar FC_N180_210zJHK.cal

Other notes: subtract a dark or a lamp-off before processing. Should see <~2 pix residuals.

Grating Tilt (Lambda-V) Verification Duration: 2hr
Telescope: @Zenith, Rotator enabled, Lights OFF in dome
LUCI: Calib unit in beam, LS0.75_450um slit, grating tilt loop closed.

Spectra: grat*
Throughslit-images: ls*
Done for N1.80-camera only

Test table:
Camera Filter Grating Mask Lamp Voltages to test
N1.80 HKspec 200_H+K LS0.75_450um Ar/Xe/Ne 3 different
N1.80 clear z 210_zJHK LS0.75_450um Ar/Xe/Ne 3 different
N1.80 clear J 210_zJHK LS0.75_450um Ar/Xe/Ne 3 different
N1.80 clear H 210_zJHK LS0.75_450um Ar/Xe/Ne 3 different
N1.80 clear K 210_zJHK LS0.75_450um Ar/Xe/Ne 3 different
N1.80 clear Ks 150_Ks LS0.75_450um Ar/Xe/Ne 3 different
N1.80 zJspec 200_H+K LS0.75_450um Ar  

First results (measured position of line at the detector in x, input was lambda of line):
If all is OK, lines should always be at the same position within a few pixels.

On-telescope night-time on-sky calibrations:

Note:
  • PM = Photometric

Twilight Flats : Duration: 0h (Twilight)
Evenings/Mornings when photometric:
Pre-requisite: clear skies
Twilight Flatfields

  • Recommend keeping the twilight flatfield counts below ~15000 ADU if at all possible
  • Broadband flats need to start immediately after sunset
  • Adjust focus through BrG before starting
  • Random dither 10x if possible

Find Center of Rotation Duration: 2h
Pre-requisite: Any dense field
Use pointing mask to also measure mechanical center of masks

> Rotator center
  • Configure for imaging with N3.75, Ks
  • Preset to any dense star field at PA=0
  • Allow to collimate
  • Take image
  • Preset to same field at PA=180
  • Allow to collimate
  • Take image
  • Also do PA=90, 270
  • Repeat on at least two different fields

> Mean coords of matched stars gives rotator center > Mean coords of reference circle gives mechanical center

> Update the configuration file with the N1.80 rotator center coords.

Verification of AGw transform Duration: 2h
Once transform is in place, take another set of data to verify.

Note: a repeated dice-5 pattern should be well-aligned with rows/columns

-- DavidThompson - 22 Apr 2013
Topic revision: r1 - 22 Apr 2013, DavidThompson
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