Telescope and Instrument Restart Plan for 1-8 September 2013 UT


Telescope Bootstrap Restart On-Sky and Focal Station Check

PreRequisites Off-sky

Engineering Tests

All of these on-sky restart activities assume that each telescope sub-system and instrument has been tested individually to the extent possible by the engineers and technicians as that system has be re-assembled or re-deployed following any summer shutdown upgrades or maintenance activities.

Closed Dome Tests

All of these on-sky restart activities further assume that each telescope sub-system and instrument has been tested with TCS 2013B in closed-dome conditions to verify its aliveness and proper interaction with other instruments and sub-systems. These tests should include closed-dome authorizations and presets.

Scattered Tests (as things become available)

  • LDG rotator movable
  • HBS on
  • All TCS subsystems successfully started
  • SX primary raised successfully
  • DX primary raised successfully
  • SXM3 successfully initialized
  • DXM3 successfully initialized
  • Dave Ashby successfully balanced the telescope
  • EL drive works
  • AGW1 @ LFBG tested
  • AGW2 @ RFBG tested?
  • Mirror ventilation untested.
  • rotators untested.
  • swingarm motion untested.
  • snow melt ventilation untested.
  • shutter/vent doors untested.

Remaining Closed Dome Tests

  • Dark Dome Light Survey
  • Dark Dome Night-Vision Survey

Telescope Bootstrap Restart On-Sky

These restart observations at the individual focal stations have minimal sky requirements. They can handle poor seeing and a limited amount of clouds. They will be done in the following order unless instrument or personnel availability suggest a change.

Twilight Startup

In addition to the normal opening procedures.....

  • Watch and Listen to Shutter Doors on opening
  • Watch and Listen to Vent Doors on opening
  • Watch and Listen to Telescope moving in elevation
  • Watch and Listen to Telescope and Enclosure moving in azimuth
  • Check Mirror Ventilation
  • Check Hydrostatic Bearing System
  • Check Chillers and Instrument Cooling System
  • Inspect Level 4 for leaks and other anomalies
  • Inspect Level 5 and telescope for leaks and other anomalies

LBC Initial Observation On-Sky

Basic Pointing and Collimation

  • Power-on LBC
  • Authorize LBC on BOTH sides
  • Connect to TCS
  • Take sky flats if time permits
    • Blue_SkyFlatScalings.ob and Red_SkyFlatScalings.ob in /home/LBTO/Calib_OBs/SKYFLAT_Scalings/ are good for obtaining a single flat in each of the LBC-R and LBC-B filters. These were designed to determine the exposure time scale factors needed for, and a more efficient ob which moves both B and R filter wheels can be made. See Flat_Fields for more details.
  • Send a BOTH TRACK preset to a pointing star
    • Verify that pointing is somewhere close (within 1 arcmin)
  • Run DOFPIA to collimate
    • Inspect Pupils
    • Verify collimation convergence (see also Issue 4009)

Guiding and Rotator

  • Play an OB with several ~3 minute exposures (subject to moon and sky conditions)
    • Verify guiding and field rotation at TCS and on science images and on tech images.
    • Verify Science and Technical images are appearing in the archive.
    • Check that Tech Chip focus corrections are being calculated and sent.

Dithered Observations

  • Play an OB with dithering
    • Verify telescope offsets

Initial Check of Focal Plane Image Quality

  • Send a BOTH TRACK preset to another target
  • Run DOFPIA to collimate
  • Take a full-frame Extrafocal/Intrafocal Image Pair (seeing should be better than 1.5 arsec)
    • Inspect the pupils
    • Analyze these images off-line
  • Take a full-frame Superfoc sequence of images through focus (seeing should be better than 1.2 arcsec)
    • Inspect these images for gross tilt and focus problems
    • Analyze these images off-line

Optional Other Tests with LBC

  • Check the Co-Pointing and Range Balancing Script
    • Send a BOTH TRACK preset to a pointing star
    • Test the IRAF script lbcrangebal for LBC co-pointing and range-balancing (the actual co-pointing and collimation will be done later)
      • record the IE/CA needed for pointing and copointing

  • Disconnect from TCS
  • Power-off LBC (assuming no further use tonight)



Reconfigure Telescope for MODS1 @ LDG

MODS1 Iniitial Observation On-Sky

Initial Pointing and Collimation and Guiding

  • Power-on MODS1 and its AGW
  • Authorize MODS @ LDG
  • Take sky flats if time permits
  • Send an ACQUIRE preset to a pointing star (see Issue 4134)
    • Verify Coma, or adjust if needed
    • Verify Pointing, or adjust if needed
  • Send an ACTIVE preset to a on-axis collimation star
    • Verify proper acquisition sequence
    • Verify guiding
    • Verify Active Optics convergence
  • Send an ACTIVE preset to an off-axis collimation star
    • Verify proper acquisition sequence
    • Verify Active Optics convergence
  • See log at

Imaging Tests

  • Play an observing sequence with ~3 min exposures
    • Verify guiding and rotator performance
  • Play and observation with dithers
    • Verify dither positions

Spectroscopic Acquisition

  • Play and observation sequence with a spectroscopic acquistion


BREAKPOINT: If the weather in September 2013 was to be incredibly bad, we must get at least to this point before the telescope can be released to do science with MODS1 and LBCs.

John is not finished editting below this line.

Reconfigure Telescope for IRTC @RFBG

Initial Calibrations with IRTC on-sky

IRTC and AGW2 Prerequisites

  • Day time commissioning of AGW1. Able to position AGw on-axis, wfs apert. coincident w/rotator center
  • AGW1 installed on telescope @ LFBG
  • AzCam readout and bias levels configured and tested.
  • IRTC installed on telescope @ LFBG
  • M3 angle surveyed to the proper position
  • 2013B configured for AGW1 at this position

Initial Pointing and Collimation of LFBG with IRTC

  • Power on AGW1 and IRTC
  • Switch PCS to be Monocular Left-sided on IIFGUI.
  • Determine initial pointing model and collimation zero points
    • Reset AZ and EL encoders
    • Point to very bright source, e.g.:
      • Vega at 18 36 56.3364 +38 47 01.291
      • Pollux at 07 45 18.9503 +28 01 34.315
      • Regulus at 10 08 22.3107 +11 58 01.945
      • Arcturus at 14 15 39.6720 +19 10 56.677 (watch out for high proper motion)
      • Note: these 4 stars are now in the default catalog used by "pointto".
    • take an image with IRTC, or put IRTC into continuous readout mode
    • collimate (by eye) to correct focus and coma. [Andrew says move only M2 RX/RY for initial collimation.]
    • offset M2 X/Y to center star on detector
    • iterate the collimation adjustment
  • Update the pointing model
    • All the left (SX) focal stations are using the same pointing model, so we don't expect that any refinement of the pointing model will be required.

Initial Rotator Zeropoint with IRTC (open loop)

This is a sanity check to make sure we understand how AGW1 is mounted. We will use the traditional LUCI1 angle until it is remeasured in a couple weeks.

  • PCS/MCSPU: Check Position Angle and Rotator Motion with IRTC
    • It was hard to find asterisms, so we make the first cut by offsetting the telescope in known directions.
      • Preset in TRACK mode and center the star with IE/CA.
      • Offset the telescope and observe which way the star moves on IRTC
      • Be certain that you are sending your offsets in RADEC space and not DETXY space.
    • take IRTC images/cubes at several Position Angles
    • verify sign (parity) and zeropoint of the Position Angle for IRTC
    • Adjust LEFTZEROPOINT in PCSInstrument.conf to refine the Position Angles

Check M3 selector angle and tip-tilt

This is a new procedure not previously included in AGw checkout. We previously set the position from the laser tracker measurement.

The M3 position and the off-axis WFS alignment can be confirmed together by taking dome-flat images with the WFS camera at 4 position angles. The motion of the pupil (shadow) can be measured on these 4 images. The goal is to get the pupil wander as a function of position angle down to ~1/4 lenslet (4 pix) which is near the measurement noise of this technique. NOTE: The optics must be collimated during this measurement.

We (Doug/John) believe that this rough M3 alignment can be completed off-sky using the shadow of the secondary in wfs dome flats.


AGW1 Re-Calibration @ LFBG - Phase 1

This procedure has been adapted from the AGw Commissioning Plan in Com201110LBBGPlan .

AGw Guider Initial Calibration

Find Hotspot on Guider to put star in center of WFSC pinhole

  • Send a GUIDE preset
  • Acquire star on WFSC
    • Option A
      • Place star on nominal "Center of WFSC Pin Hole" position (guiding is doing this)
      • If no S-H spots, then stop guiding and move guide probe small amounts in spiral pattern until spots found
      • Move guide probe in +x,-x, and +y,-y till spots are vignetted. Use the GCS command setHotspot. (On AGw1, +Y moves stars down of the wfs image, +X moves the stars to the right wrt/lenslets.)
    • Option B
      • Stop guiding
      • Move telescope around with IE/CA to search for spots
    • Note guider (x,y) image position of "Center of WFSC Pin Hole" and guide probe position of "Center of WFSC Pin Hole". Adjust the configuration file as needed.

Measure Rotator Center and establish the position of the optical axis

  • Determine rotator center in AGw space
    • Start up the AGW unit
    • Move AGw probe to nominal on axis position (usually 0, 612.5 mm)
    • Rotate the rotator (TO command) while taking a 70 sec exposure on the guide camera
    • Reposition AGw stage to align with rotator center (Jesper)
    • Repeat as needed to position rotator center on WFS aperture
  • Verify Rotator Center position in IRTC space (optional here, but needed later for transform calculation)

Guiding Tests

  • Test closed loop guiding on-axis with GCS
    • Did the acquisition offset center the star in the guide box?
    • Is the guiding stable to perturbations, or does the star drift off in the wrong direction?
  • Sort out required parameter changes to make guiding stable.
  • Repeat the test and Guide off-axis to verify rotator rates and flip parameters

AGw WFS Camera Initial Calibration

Warning: AGW2 WFS camera is upside down compared to AGw3 and AGw4. This is because of clearance issues for the new flexible cables.

Initial Check of Active Optics Corrections

  • Option A - GCS
    • Send preset to on-axis star in ACTIVE mode with sending corrections to PSF blocked
    • Calculate Zernike aberrations, send them manually with PSF starting with focus, then coma, then astigmatism, trefoil
    • Calibrate orientation of Z's, single mode, and adjust rotation of zernikes as needed.
  • Option B - IDL
  • Use Z9, Z10 to refine the Doug's angle offset
  • Verify that both IDL and GCS agree on the angles and flips.

Initial Closing of Active Optics Loop

  • Option A - GCS
    • Send preset to on-axis star in ACTIVE mode with sending corrections to PSF enabled
    • Calculate Zernike aberrations, send them manually with PSF starting with focus, then coma, then astigmatism, trefoil
  • Option B - IDL
  • Verify that both IDL and GCS agree on the convergence of the active wavefront solution.

Off-axis Active Optics

  • Verify the pupil positioning for off-axis stars is going in the right direction.
    • First on the Y-axis
    • Then over the whole field
  • Verify the range of pupil motion available on the WFS camera.
  • Verify active optics convergence at extreme field positions
  • Calculate Zernike aberrations, send them manually with PSF starting with focus, then coma, then astigmatism, trefoil
  • Verify that both IDL and GCS agree on the angles and flips.
  • Refine the pupil centering position. (Doug)

Focus the Guider relative to IRTC

This procedure needs good seeing. 0.6 arcsec or better in order to achieve sufficient precision.

  • This is the fast procedure which does NOT run Active Optics while stepping the secondary mirror.
    • Preset in ACTIVE mode
    • Allow a few minutes for active optics to collimate.
    • Record the nominal focus offset and the present off-axis position.
    • Press StopWFS button on GCSGUI
    • Run a script to take a series of image cubes while offsetting focus. (for IRTC: cl < home$ )
  • Repeat the procedure several times until you've converged on a value for the focus offset.

  • The slow procedure would make steps in the nominal probe focus offsets and run active optics at each step. This turns out to be vulnerable to changes in the seeing over the tens of minutes that the procedure.

Check X-Y position of probe relative to focus position

This procedure does not care so much about the seeing.

See BGTechProcedures for the procedure.

Phase 2 involves re-measuring the transformation after LUCI has been remounted.

Binocular Pointing and Collimation Update for All Science Focal Stations

LBC Collimation, Co-Pointing and Pointing Models (doesn't care about seeing or clouds, but requires stable temperature conditions)

Here we are collecting data for collimation, co-pointing and pointing all at the same time.

For 28 stars over a range of elevations from 20 to 85 degrees, do the following: (select them in a grid with Pointingstars5)

  • Play an OB for the target field
  • Run DOFPIA to collimate
  • Run the IRAF script 'lbcrangebal' to range-balance and co-point while maintaining collimation.
  • Replay the OB to take another pair of images which record the mirror positions in the headers.

After the new pointing models (should be the same or nearly the same for both Red and Blue) are installed. Check them on ~5 stars.

LFBG/RFBG Collimation, Co-Pointing and Pointing Models

Note: The high priority activity is to collection collimation and pointing data for the Left Side (LFBG or LDG). However, if the scripts work, it takes the same amount of time to collect data for both sides simultaneously. Thus, our plan is to do both sides, but we have a fallback to the left side only if there are problems.

Collimation, Range Balancing and Co-Pointing

For 9 stars over a range of elevations from 30 to 85 degrees, do the following:

  • Send an ACTIVE preset for the target field
  • Wait for GCS to collimate
  • Run the IRAF script to range-balance and co-point
  • Record the mirror positions

Pointing Model Data

Pointing Model Confirmation

Field Aberration Check (requires good seeing)

If time permits, it would be useful to check field aberrations at LFBG and LDG.

Other Activities

Mixed Instrument Collimation

Check the mixed instrument co-pointing. (done in closed dome on 20130910)

(Much of this can be closed-dome work)

JCG Atmospheric Experiments

Collect Fast Data with Binocular S-H sensors

Test IDL Binocular Commands

Test Doug's new IDL commands for sending binocular presets (done)

Test mixed presets with LBTI and IRTC(aka PICSES)

Test LN Pathfinder Guiding via irc

-- JohnHill - 01 Sep 2013
Topic revision: r7 - 14 Sep 2013, JohnHill
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