6-7 January 2009

Telescope/TCS Checkout for LUCIFER Com3
UT 2009 January 07

Observers: D.Thompson (@LBT) A.Rakich with N.Ageorges, W.Seifert, M.Juette (Tucson)
Software Support: Michele de la Pena (Tucson)
Telescope Operator: Aaron Ceranski

Summary:

Night lost to blowing snow particles

  • Verified Preset completes after Gstar on WFS for 2 consecutive cycles
  • Re-check ABS/REL offsets in RADEC and DETXY (seems to work, analysis to follow)
  • Verified all offset pointing functionality works as expected
    see: offset_tests.20090107.txt: offset_tests.20090107.txt.
  • Implemented new multi-night LUCIFER collimation model
    SXPMLUCIFERCollimation.20090107.dat
    Includes improved temperature terms for X,Y,Z, and RY (RX consistent with zero)

Details:

JHill noted via email yesterday that on data from 02 Jan 2009 he checked GCS 2.01 and verified that it does indeed wait for the guide star to be on the WFS for 2 consecutive cycles (out of 5 max) before returning on the preset.

Beginning of the night: wind is too high and there is significant blowing snow off the trees. We cannot open yet.

Verified clocks on AGW, lbtmu05, lbtmu01, LUCIFER are consistent.

07:24 Completed taking data to show ABS/REL offsets in DETXY/RADEC. Data analyzed - all ABS/REL offsets in RADEC/DETXY mode work as expected. Note that the achieved coordinates in the DD do not behave as expected. The current coordinates are placed at the current pointing origin.

11:09 Clear, but the wind is still lofting large amounts of powder snow. T=-3.7C RH=53.3%

01:01 Re-ran the LUCIFER multi-night collimation model (536 data points) to confirm the new temperature coefficients. The data spans -2.9 to +4.9 C. Earlier problems with initial coma likely due to inverted sign on the X term, inducing coma at non-zero temperatures. New model copied to the appropriate place and loaded in PSF. Plot of the fit attached (bestfit_collim.jpg:
bestfit_collim.jpg

01:21 Still blowing snow. T=-4.4 RH=59.8%

04:50 Still blowing snow. T=-3.1 RH=59.1%

End time = 05:00

Advanced Planning:

Explicit Build17 TCS checkout tests, closed dome:
  • Verify clocks on LUCIFER, AGW, TCS computers are in sync.

Execute TCS startup checklist (complete @ sunset - 1hr):
  • Include mount encoder resets each night. Encoders reset.
  • At end of startup, issue a standard preset: completed successfully

Startup pointing & collimation correction (10 minutes):
  • Use source list: Persson.cat
  • Select target at mid EL (50-70 degrees)
  • Preset in PARALLACTIC/TRACK mode
  • Adjust IE and CA; manually focus if necessary
  • Preset in POSITION/ACTIVE mode on axis
  • Allow system to collimate (WFS<400nm rms)

Explicit Build17 TCS checkout tests, open dome:

MCS pre-processor algorithm verification (30 minutes):
  • Prerequisite:
    D.Ashby to confirm tests are needed, procedures to be used
  • Use source list: Persson.cat
  • Select target at mid EL (50-70 degrees)
    1. Preset ACTIVE mode on-axis to collimate
    2. Preset PARALLACTIC/TRACK mode to align DETXY to AZ/EL
    3. Start sequence with LUCIFER 120x1.0sec
    4. Offset 20 arcsec each in XY or NE
    5. Repeat steps 2-4 with larger offsets (60, 120, 240, 600 arcsec)
    6. Repeat step 1 as needed for collimation drifts
  • Note if dawdle-snap behavior remains
  • Data:
    LUCI# Observation Description
       
       
       
  • Results:

Verify collimation updates not double-applied:
  • Run WFS collimation for 5 min with PSF collimation updates held
  • send stepFocus 0.0
  • should see resulting image in good focus/collimation

Verify Collimation Flag functionality:
  • Watch isCollimated flag in DDViewer
  • Should go to FALSE on all presets/offsets

Verify Functionality of Hold Zernike Corrections until Stepfocus

Verify Preset completes after Gstar on WFS:
  • Before preset completes, verify that guider completes 2 cycles and the guide star is accurately on the hotspot.
  • GCS may not display these initial images
  • May need to verify through the syslog

Confirmed on data taken last Friday:
  • From Friday evening's data, I (JHill) verified on sky that GCS v2.01 does wait for 2 good guider frames before concluding the preset command.
    • For preset concluding at 20:20:46 on 02-Jan MST, these were images 00001 and 00002.
    • For preset concluding at 22:31:22 on 02-Jan MST, these were images 00057 and 00058.

Focus LUCIFER/AGW on sky (30-45 minutes/field):
  • Prerequisite: Stable atmospheric seeing
  • Use source list: Persson.cat, LUCIastrom.cat?
  • Select target at mid EL (50-70 degrees)
  • In an xterm: ssh agwuser@agw-control
  • Preset in ACTIVE mode using off axis guide star
    1. Offset, take sky frame, return to preset position
    2. Offset AGW focus stage (0, -6, 6, 0, -3, 3, 0 mm from nominal).
      To set the AGw focus position, on agw-control window type:
      1. getfocus
      2. setfocus -p NN.nnn (absolute position in mm)
    3. Take min 30s exposure to average over seeing
    4. Repeat steps 2-3 stepping through focus sequence
    5. Derive best focus position (millimeters)
    6. Update focus in /lbt/tcs/current/etc/GCS/AIP_L.cfg
  • Repeat for at least 3 different stars at different ELs
  • Data:
    LUCI# Focus FWHM
         
         
         
  • Results:

Active Optics Jump Tests (2hr)
  1. Start with a faint guide source at around 80 degrees. In closed loop (active optics + guiding) demonstrate the jumps. The guide source should be selected so that 5 second exposures are possible without saturating the detector. (15 minutes ACTIVE mode)

  1. Open both the guiding and active optics control loops. GCS must still report centroid positions. This data will serve as an open-loop baseline observation. GCS centroid data should be collected for 15 minutes (around 150 GCS updates). (ACTIVE mode, stop WFS, block guiding)

  1. See next test. Take 5 minute data (2 sec LUCIFER images) in GUIDE mode

Verification of Guiding Performance:
  • Take 5 min data (2 sec LUCIFER exposures) in GUIDE mode
  • Compare with the ACTIVE mode

Measure/Correct LUCIFER rotation angle (15-30 minutes/field):
  • Use source list: LUCIastrom.cat (any field with lots of stars in USNO-B1)
  • Preset to field, ACTIVE mode with off-axis guide stars
  • Take min 30sec exposure to average over seeing
  • Offset and take a sky exposure, same settings
  • Apply astrometric solution, determine rotator offset
  • Update LEFTZEROPOINT in the LUCIFER section of /home/telescope/TCS/Configuration/PCS/PCSInstrument.conf
  • Repeat on at least 3 fields (more=better), different elevations
  • Goal: Orientation better than +/-0.02 degrees
  • Data:
    LUCI# Field/Description PA(requested) PA(WCSfit)
           
           
           
  • Results:

Measure AGW Z-axis orthogonality (20min per cycle):
  • Needs telescope in thermal equilibrium, decent stable seeing
  • Correct pointing (IE/CA) prior to this test
  • Use source list: Persson.cat, collim.cat
  • Select target at mid EL (50-70 degrees)
  • In an xterm: ssh agwuser@agw-control
  • Preset in ACTIVE/ mode, on axis, PA=0
    1. Collimate on axis
    2. Stop WFS, stop guiding
    3. Take 10x 2sec images with guider
    4. Offset AGW focus stage -5 (+5) mm from nominal.
      To set the AGw focus position, on agw-control window type:
      1. getfocus
      2. setfocus -p NN.nnn (absolute position in mm)
    5. Take 10x 2sec images with guider
    6. Repeat steps 3-4 at other focus position
  • Repeat from preset several times
  • Data:
    LUCI# CentroidSorted ascending Notes
         
         
         
  • Results:

Re-Measure AGW-PCS Transformation (2hr per field):
  • Prerequisites:
    LUCIFER accurately oriented on sky
    (PA=0 requested yields PA=0.00+/-0.02 achieved)
  • Use source list: Persson.cat (9122, 9126, 9134, 9143)
  • New finding charts attached to wiki page for 02-03 Jan:
    http://wiki.lbto.arizona.edu/twiki/bin/view/Commissioning/Com20090103
  • Use on-axis source with off-axis guide star that can be dithered 2+ arcmin in DET_Y
    1. Take min 30s integrations at each position
    2. Measure angular offset (0.02 deg = 0.35 pixels/1000)
    3. Update SFP_rotation in /lbt/tcs/current/etc/GCS/AIP_L.cfg
    4. Repeat steps 1-2 to confirm sign is correct
  • Repeat on 3 fields, different EL

Field Aberration Stability Test (1 hr):
  • ARakich
  • 4-8 Stars
  • Needs telescope in thermal equilibrium

Update Collimation Model (2+ hrs data collection, plus processing time):
  • PROBABLY NOT NEEDED, JUST VERIFY MULTI-NIGHT COLLIMATION MODEL FROM DEC
  • Prerequisites:
    TELESCOPE IN THERMAL EQUILIBRIUM!
    DECENT SEEING (less than 1.25 arcsec FWHM on guider)
  • Confirm needed mirror positions, temps in LUCIFER headers
  • Use source list: collim.cat
  • Observe sources: 25(15) < EL < 87 if possible
    1. Preset in ACTIVE mode, on-axis
    2. Allow system to collimate: WFS<400nm rms
    3. Take 2s exposure with LUCIFER to record mirror information
    4. Repeat steps 1-3 as needed to cover EL-space
  • Observe minimum 1 full cycle through EL range, 12 sources,
    Prefer two cycles, 20+ sources.
  • Generate new collimation model (J.Hill?)
  • Implement new collimation model
  • Data:
    # LUCI# UT EL   # LUCI# UT EL
    01       * 02      
    03       * 04      
    05       * 06      
    07       * 08      
    09       * 10      
    11       * 12      
    13       * 14      
    15       * 16      
    17       * 18      
    19       * 20      
  • Results:

Update Pointing Model (2-4 hours data collection, plus processing time):
  • Prerequisites:
    TELESCOPE IN THERMAL EQUILIBRIUM!
    Using new collimation model from previous step
    Verify with LUCIFER Team that internal flexures are corrected
    Re-measure mechanical rotator center coords on LUCIFER
    • Take pair of TRACK mode images rotated 180 degrees apart
    • New rotator center: X Y
  • Update pointing and collimation prior to start, mid EL (50-70 degrees)
  • Use source list: Allstars10.cat, updated to include PA=0 in list
  • Turn on pointing log in PCS GUI
    Filename = ____________________
  • Use /home/LBTO/POINTING/Pointingstars5 to schedule
    1. In your working directory on an observer workstation:
      cp ~LBTO/POINTING/* . to copy program files
    2. Type ./Pointingstars5 at linux prompt to run program
    3. Enter the sequential reference field number [1-88]
    4. Preset to the source listed, TRACK mode, take 30s exposure.
    5. Repeat steps 2-4 for at least 24 points, 48+ would be better.
  • Stop pointing log in PCS GUI
  • Generate new pointing model (D.Thompson)
  • Implement:
    • Copy to ~telescope/TCS/Configuration/PCS/
    • Update LUCIFER entry for LEFTPOINTINGMODEL
      in PCSInstrument.conf
    • Re-authorize LUCIFER on IIF GUI to read in new pointing model
  • Test new pointing model
  • Data:
    # LUCI# Star ID   # LUCI# Star ID   # LUCI# Star ID
    01     * 02     * 03    
    04     * 05     * 06    
    07     * 08     * 09    
    10     * 11     * 12    
    13     * 14     * 15    
    16     * 17     * 18    
    19     * 20     * 21    
    22     * 23     * 24    
    25     * 26     * 27    
    28     * 29     * 30    
    31     * 32     * 33    
    34     * 35     * 36    
    37     * 38     * 39    
    40     * 41     * 42    
    43     * 44     * 45    
    46     * 47     * 48    
    49     * 50     * 51    
    52     * 53     * 54    
    55     * 56     * 57    
    58     * 59     * 60    
    61     * 62     * 63    
    64     * 65     * 66    
    67     * 68     * 69    
    70     * 71     * 72    
    73     * 74     * 75    
    76     * 77     * 78    
    79     * 80     * 81    
    82     * 83     * 84    
    85     * 86     * 87    
    88     * 89     * 90    
  • Results:

-- JoarBrynnel - 06 Jan 2009

Topic revision: r8 - 16 Jan 2009, JohnHill
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