UT 20130920 AO#2 DX and AGw2 Calibration
Observer: DMiller, JChristou, JHill (LBTO)
Telescope Operator: GBechetti
SW Support: JKraus
AO Support: JChristou
Telescope Support: KNewton
Instrument Support: ESolheid
The good news: We have finished the pre-LUCI2 phase of the off-axis AGw2 alignment. That includes centering the guide probe; refining the guiding hotspot position; refining the pupil center position; adjusting M3 to minimize pupil wobble;
and adjusting DX M2 to minimize binodal astigmatism.
The bad news: The sagging as a function of rotator angle has returned - Issue 4790. So while it
is properly aligned optically, AGw2 is not performing well as a guider.
We lost some time to humidity at the beginning and the end of the night, but conditions were decent in between.
We verified that the residual pupil wobble for AGW2 (big W) is with the range of the camera lens.
02:00 Open chamber
02:15 Test of WFS communication to AdSec
02:10 Geno set pointing
02:20 Doug S will do some LBC on the LEFT side. Geno authorize IRTC@RFBG and LBC@LeftPrime.
02:25 Put +100 Tilt on M2 and -100 CA to correct binodal.
DX M2 Manual Pointing Offsets are X=-5.107 RY=-982.
02:27 Send RIGHT preset but failed because too far from LLBC pointing position
02:29 irc_binocularcontrol, 'CLEARPRESET', /LEFT and /RIGHT
02:30 Left preset accepted
02:33 94% Humidity
See Issue 4810
Setting the new guiding hotspot for AGw2
03:40 Used output of gcs_wfsc_display (x,y average removed) and command line % getHotspot right and % setHotSpot right -x 280 -y 225 to determine the center of the pinhole (i.e. the correct guiding hotspot)
03:50 Updated the GCS config file /home/telescope/TCS/Configuration/GCS/LUCI_IRTC_R.cfg with the
new guide hotspot of: X=280, Y=225
03:56 Set "pseudomono" on right -- had been pure binocular before this.
Centering the rotator axis to hotspot
04:03 ACTIVE preset on right (LBC on left is passive)
04:05 image 0002 had peculiar hotspot (used for centering on IRTC last night).
04:09 Set RIGHTPOINTINGORIGIN to 0.0 0.0
to so the guide probe is put on axis on a preset.
04:10 ACTIVE preset on right (LBC on left is passive)
take test image (the one that always fails after you stop guiding)
Move guide probe to the nominal center -- setxy -u 2 -x 0.0 -y 612.5
04:1x readGuideCam right -e 80000 -- right_guider 0003 had a loopy circle ???? See JPEG attached below.
(JMH: 4 hours later the light bulb goes on, and we understand that the funny shape in our circle is caused by
something loose in AGw2. This is the same thing that causes the pupil wobble. This indicates that it is something that affects both guider and wfs (e.g. the theta stage).
- Circle for measuring rotator center with distortion:
04:18 readGuideCam right -e 80000 --
right_guider 0004 134,139 ---> 142,146 --->284,292
need -67 unbinned pixels in Y ---> +2000 microns RAD ooffset
04:37 Change AGw2 RAD ooffset from 417147 to 419147
Stop GCSR, stopAGw, stop and restart oacserver, startAGw, start GCSR
Lost the star
04:47 ACTIVE preset -- but didn't find star ????? WHY?
.............see the Night Log
Found star at IE=-6 CA=-131
Reapply Tilt=+100 to M2 and adjust CA by -100 to -231
05:25 ACTIVE preset to new BS star BS9186
05:33 readGuideCam right -e 90000 -- right_guider 0005 very jumpy
ptincrement 1 CA 5
05:37 readGuideCam right -e 90000 -- right_guider 0006
ptincrement 1 CA 10
05:40 readGuideCam right -e 90000 -- right_guider 0007
center of rotation is approx 130,107 ---> 138,115 ---> 276, 230 (matches the hotspot within the large measurement uncertainty -- the open-loop tracking is very jumpy even though the seeing is not so bad)
Refine AGw2 Pupil Wobble
05:47 ACTIVE preset BS9186 at EL=56 - but rotator doesn't want to move ?? Geno restarts rotator, and preset fails with jumpy acquisition offset.
05:53 Resend ACTIVE preset BS9186 - fails with jumpy acquisition offset again.
Preset misses the acquisition offset. Is this because of PM mode? See Issue 4811.
05:55 Authorize IRTC on right None on left.
05:56 ACTIVE preset BS9186 -- preset succeeds with smooth acquisition offset.
Doug is running pupil_collect. DX M3 Global offsets are zero.
06:28 DX M3 Global Offset Tip=+200, Tilt remains 0.
06:31 DX M3 Global Offset Tip=-50, Tilt=+200.
06:35 DX M3 Global Offset Tip=-50, Tilt=-200.
06:39 DX M3 Global Offset Tip=-150, Tilt=-500.
06:42 DX M3 Global Offset Tip=-300, Tilt=-500.
06:45 DX M3 Global Offset Tip=-300, Tilt=-700.
startWFS right (from the command line)
stopWFSing (from the GCSGUI)
07:06 DX M3 Global Offset Tip=-150, Tilt=-350
. Absolute Tip=-558 Tilt=+330 RZ=-25.830
JMH: These were merged into oss.conf the following afternoon.
Stop here, even though the pupil wobble has converged to a line. We reopened Issue 4790.
Set New Pupil Center Position
New value in LUCI_IRTC_R.cfg wfscam_hotspot_x = 369.5 wfscam_hotspot_y=258.4 pixels
Field Data BS9107
07:45 ACTIVE preset to BS9107 at EL=52
07:47 ACQUIRE preset -- IE=+2 CA=-218
|| wfsc #
|| wfsc #
Seeing on DIMM is ~0.9, Seeing on guider and wfs is ~0.7.
08:30 *Apply Tip-tilt correction for binodal to DX M2 Tip=+15 Tilt=+90 arcsec (absolute)
deltaIE=-15 ---> IE=-13 deltaCA=+10 ---> CA=-208*
DX M2 Manual Pointing Offsets are X=-4.596 Y=-0.766 Z=0 RX=147.3 RY=-883.8
JMH: These have been merged into the DXSM collimation files the following afternoon.
On 20130921 UT, Doug/John measured and adjusted the binodal astigmatism for
RFBG. These corrections have been merged with the global offsets
below to make the final collimation values. This has been applied in
DXSMIRTCFCollimation.dat for IRTC@RFBG and for all the other right
side focal stations. Global offsets should now appear to be zero.
DX M2 Manual Pointing Offsets X=-4.596 Y=-0.766 Z=0 RX=147.3 RY=-883.8
DX M2 Global Offsets are X=-1.569 Y=-0.368 Z=0 RX=-340.0 RY=-55.0
DX M2 Collimation Offsets X=+3.543 Y=-2.930 Z=0.899 RX=-322.0 RY=+722.0
DX M2 New Collimation Offsets X=-2.595 Y=-4.064 Z=0.899 RX=-514.7 RY=-216.8
JMH: The corresponding IE=-13 CA=-208 pointing corrections have been merged into all the DX Gregorian poinitng models on 20130924.
Second set of field data
|| wfsc #
09:00 Now with AzCam 5.1 and in monocular mode, the cycle time of the guide loop is the exposure time plus 1.1 sec
of readout (0.6 sec) and analysis (0.1 sec) and other (0.4 sec) including moving telescope . Thus with 2000 ms guider exposures on AGw2 we are guiding at 0.32 Hz.
DX AO Observational Robustness Testing
Humidity is rising......
Pyramid Pupil Wobble
09:21 ADAPTIVE_ACE preset to AO262 at EL=33 -- astigmatism LUT is off -- gs9 is a binary
09:33 Offset -- failed -- did Bayside stages move?
09:36 ADAPTIVE_ACE preset to AO262 at EL=35
09:50 acq sky_irtc_psf
10:21 close for rising humidity
- 20 Sep 2013