LBBG Commissioning with AGW1: 04 November 2011 UT

Observer: JHill, JHeidt, RPogge (LBTO)
Telescope Operator: DHuerta (LBTO)
Telescope Support: RHansen (LBTO)
Instrument Support: JMorris (LBTO)

Summary

Got some good transformation data

Corrected the pupil shift direction for GCS wfs.

Determined the center of rotation for the IRTC

First guiding tests

3/4 of the night lost due to winds

Details (all times are UT)

Open

00:35 Open, lots of Cirrus around, some more thick clouds in NW, T=3.8C, TGlass=4.0, Hum=33%, Wind 10m/s from SW

ACQUIRE preset to pointing star (WT10 334), OK

00:56 Active preset, BS9183, gs=0, on-axis, do collimation,

01:06 Guide preset, BS9183, gs=1

01:10 Start collimation via IDL, collimate_multiple, 3, /send (twice), doesn't collimate nicely, seems to be out of focus

01:15 Guide preset, BS9183, gs=6 (is brighter than gs01), collimate_multiple, 3, /send, looks crazy, check left_wfsc000008_dd.fits, top of frame is saturated???

01:22 Guide preset, BS9183, gs=0, collimate_multiple, 3, /send (twice)

Refined Coordinate Transformation using Stone_O

Goal is to improve upon the basic solution found last night. We're using the Stone O field as the best placed at this time. A nice hole in the clouds, and seeing 0.7 arcsec.

01:26 ACQUIRE preset to Stone_O

01:30 Transform_collect,/GCS, Stone_O_LBBG.list (old rotator problem, no response on Issuetrak #3774), had to restart, 11 start at PA=180, 190 and 170, each.

01:45 Transform_collect,/GCS,limits=4000,Star=3 cont'd (i.e. no collimation), some of the images look like donuts

Changed direction of GCS pupil shift from -1 to +1 in AGW1_IRTC.cfg. This is probably why off-axis active optics was diverging previously.
   WFS_pupil_dir_x          1              int     # which direction will the pupil shift? Default is +1
   WFS_pupil_dir_y          1              int     # which direction will the pupil shift? Default is +1

02:34 Restart GCS

02:35 Redo transform_collect, /GCS, allow this time for collimation, works! Images are now much rounder, seeing ~0.7-0.8" at guider and on the images. Weather has improved a bit, sky mostly clear now with thin stuff blowing past, wind is picking up a little. LEFTZEROPOINT is 114.8 (same as the previous night).

Table of Star Observations of Stone O

GStar wfsc # Single Image Cube Image
0 0 irtc.20111104.023611.fits irtc_20111104.20111104.00035_cube.fits
1 72 irtc.20111104.023703.fits irtc_20111104.20111104.00036_cube.fits
11 73 irtc.20111104.023831.fits irtc_20111104.20111104.00037_cube.fits
15 75 irtc.20111104.023959.fits irtc_20111104.20111104.00038_cube.fits
24 77 irtc.20111104.024201.fits irtc_20111104.20111104.00039_cube.fits
23 79 irtc.20111104.024403.fits irtc_20111104.20111104.00040_cube.fits
28 81 irtc.20111104.024605.fits irtc_20111104.20111104.00041_cube.fits
26 83 irtc.20111104.024805.fits irtc_20111104.20111104.00042_cube.fits
33 84 irtc.20111104.025004.fits irtc_20111104.20111104.00043_cube.fits
32 85 irtc.20111104.025132.fits irtc_20111104.20111104.00044_cube.fits
12 86 irtc.20111104.025259.fits irtc_20111104.20111104.00045_cube.fits
10 87 irtc.20111104.025419.fits irtc_20111104.20111104.00046_cube.fits
1 88 irtc.20111104.025548.fits irtc_20111104.20111104.00047_cube.fits
11 89 irtc.20111104.025716.fits irtc_20111104.20111104.00048_cube.fits
15 90 irtc.20111104.025845.fits irtc_20111104.20111104.00049_cube.fits
24 91 irtc.20111104.030014.fits irtc_20111104.20111104.00050_cube.fits
23 92 irtc.20111104.030143.fits irtc_20111104.20111104.00051_cube.fits
28 94 irtc.20111104.030311.fits irtc_20111104.20111104.00052_cube.fits
26 97 irtc.20111104.030514.fits irtc_20111104.20111104.00053_cube.fits
33 98 irtc.20111104.030749.fits irtc_20111104.20111104.00054_cube.fits
32 99 irtc.20111104.030917.fits irtc_20111104.20111104.00055_cube.fits
12 100 irtc.20111104.031047.fits irtc_20111104.20111104.00056_cube.fits
10 101 irtc.20111104.031210.fits irtc_20111104.20111104.00057_cube.fits
1 102 irtc.20111104.031338.fits irtc_20111104.20111104.00058_cube.fits
11 105 irtc.20111104.031507.fits irtc_20111104.20111104.00059_cube.fits
15 106 irtc.20111104.031742.fits irtc_20111104.20111104.00060_cube.fits
24 107 irtc.20111104.031909.fits irtc_20111104.20111104.00061_cube.fits
23 108 irtc.20111104.032038.fits irtc_20111104.20111104.00062_cube.fits
28 109 irtc.20111104.032204.fits irtc_20111104.20111104.00063_cube.fits
26 111 irtc.20111104.032333.fits irtc_20111104.20111104.00064_cube.fits
33 113 irtc.20111104.032535.fits irtc_20111104.20111104.00065_cube.fits
32 114 irtc.20111104.032737.fits irtc_20111104.20111104.00066_cube.fits
12 116-117 irtc.20111104.032906.fits irtc_20111104.20111104.00067_cube.fits

Attached below is the transform.dat file with the measurments of 29 stars derived using from transform_process_set and cube 00036 for the sky. Note that no star appeared in the data for cubes 00047 and 00058, so these were removed from the processing list for generating the data in transform.dat

Because the IRTC FITS headers do not include the AGW_xyz keywords, we had to extract them from the telescope logs with grep and using the time tags, as follows:
     grep '::setxy' /lbt/logs/current.log | grep ' 02:'
     grep '::setxy' /lbt/logs/current.log | grep ' 03:'
which covers the observations made between 02:36 and 03:29 UTC according to the file names.

The link to the data were sent to Jesper for analysis.

Transformation results from Jesper

From: Jesper Storm 
Subject: Re: Stone O AGw1 Transformation Data
Date: Tue, 8 Nov 2011 17:04:59 +0100

Hi Rick and John,

  thanks for the Stone-O data. I have been out of town and only got to analyze
them now. After rejecting three peculiar stars I got:

Field: Stone_O_2011_Nov_04agw1
rgpoff:  0.5400000 psigpoff:  6.1732440
Quad III
Transformation:
ax1 + by1 + kx = x2
 -0.96755720853893035      -1.42937850202725820E-002   1.2100879366268749
ax1 + by1 + ky = y2
  1.42937850202725820E-002 -0.96755720853893035        613.46927357560651
RMS(X)=  0.02564  RMS(Y)=  0.04225

        Scale factor: 0.96745
Rotation Angle (rad):   3.1563621
Rotation Angle (deg): 180.8463734

  The scatter is looking good but it is a bit peculiar that the scale factor
is only 0.967. Normally we are much closer to unity.

  I have prepared a revised configuration file on the agw-control computer:
/home/agwuser/oacontrol.conf.20111108a which you can install when needed.

03:31 Tests for Tom Sargent: Preset to BS9192 (JMH accidentally truncated the transformation data)

Center of rotation of IRTC

Setting to BS9188 to measure the rotator center for the IRTC at LBBG.

03:40 pointto BS9188 gs=0 GUIDE PA=INDEF=0, collimate

03:49 pointto BS9188 gs=0 track PA=INDEF=0

David moved LBBG rotator to 360° before we took a data cube of 90 images before and after slewing the rotator to 0°
   takeseq 1.0 90 irtc.20111104.035545.fits and cube 0069 without any rotation 
   takeseq 1.0 90 irtc.20111104.035806.fits and cube 0070 rotating from 360 through 0

Applied a mount offset with CA=+40 and took a 90-image blank-sky data cube to use at a mean sky for analysis.
   takeseq 1.0 90 irtc.20111104.040133.fits and cube 0071
put CA back to -10 to remove the offset.

Cube 0070 was started too late and we didn't get a closed loop. Aborted another cube run from 0-to-360° because of a false start on the IRTC images.

Repeated the 360-to-0° rotator slew with a 120-image data cube (00072_cube.fits):
   takeseq 1.0 120 irtc.20111104.040821.fits

Analysis of Center of Rotation:

Created the cube sum from the 120-image data cube 00072_cube.fits, and subtracted the mean sky extracted from data cube 00071_cube. Used a marginal sum bisector method in X then Y to find the center of the ring:
   Xcen = 167.5
   Ycen = 131.9
Reduced data used for this analysis are in /OldRepository/AGW_Data/20111104/CoR/

Guiding and offset tests

Setting up for a series of Dice5 runs.

04:24 pointto BS9188, active, GS=14, PA=0

The star ended up on the bottom-center quarter of the IRTC FoV. We applied offsets to move it to the field center, as at the offset position the larger dice patterns would march off the detector.

Took a few tries, and we had to have David "aborb" the DETXY offsets to reset the pointing reference as we did not know the IRTC command to do the same and one of us (RWP) knew what to do at the TelOps console rather than hunting through the wiki for the IRTC manual.

This offset between where the stars lands on the IRTC and the CoR measured above is puzzling and should be investigated - it was very consistently in the offset position roughly 7-8 arcsec from the nominal center of rotation.

04:53 dice5, 5x5, 2.0 30 3 loops (high elevation, 75degs) (cubes 78 - 92, irtc.20111104.045351 - 051530)
2011-11-04T04:53:47.258119+00:00 obs3 irc[24015]: OffsetPoiting ANGLE=0. OffRA=0. OffDEC=0. Sys=DETXY OPE=MOUNT NP=true Move=ABS Side=left
2011-11-04T04:54:59.582484+00:00 obs3 irc[24245]: 30 r://irtc_20111104.20111104.00078_cube.fits
2011-11-04T04:55:20.733456+00:00 obs3 irc[24333]: OffsetPoiting ANGLE=0. OffRA=-5. OffDEC=5. Sys=DETXY OPE=MOUNT NP=true Move=ABS Side=left
2011-11-04T04:56:31.687408+00:00 obs3 irc[24567]: 30 r://irtc_20111104.20111104.00079_cube.fits
2011-11-04T04:56:52.146958+00:00 obs3 irc[24658]: OffsetPoiting ANGLE=0. OffRA=5. OffDEC=-5. Sys=DETXY OPE=MOUNT NP=true Move=ABS Side=left
2011-11-04T04:58:05.789829+00:00 obs3 irc[24889]: 30 r://irtc_20111104.20111104.00080_cube.fits
2011-11-04T04:58:27.849436+00:00 obs3 irc[24977]: OffsetPoiting ANGLE=0. OffRA=-5. OffDEC=-5. Sys=DETXY OPE=MOUNT NP=true Move=ABS Side=left
2011-11-04T04:59:37.934557+00:00 obs3 irc[25210]: 30 r://irtc_20111104.20111104.00081_cube.fits
2011-11-04T04:59:59.215790+00:00 obs3 irc[25298]: OffsetPoiting ANGLE=0. OffRA=5. OffDEC=5. Sys=DETXY OPE=MOUNT NP=true Move=ABS Side=left
2011-11-04T05:01:12.222304+00:00 obs3 irc[25530]: 30 r://irtc_20111104.20111104.00082_cube.fits
2011-11-04T05:01:33.151304+00:00 obs3 irc[25621]: OffsetPoiting ANGLE=0. OffRA=0. OffDEC=0. Sys=DETXY OPE=MOUNT NP=true Move=ABS Side=left
2011-11-04T05:02:44.226253+00:00 obs3 irc[25855]: 30 r://irtc_20111104.20111104.00083_cube.fits
2011-11-04T05:03:06.773968+00:00 obs3 irc[25943]: OffsetPoiting ANGLE=0. OffRA=-5. OffDEC=5. Sys=DETXY OPE=MOUNT NP=true Move=ABS Side=left
2011-11-04T05:04:18.353362+00:00 obs3 irc[26173]: 30 r://irtc_20111104.20111104.00084_cube.fits
2011-11-04T05:04:39.273407+00:00 obs3 irc[26261]: OffsetPoiting ANGLE=0. OffRA=5. OffDEC=-5. Sys=DETXY OPE=MOUNT NP=true Move=ABS Side=left
2011-11-04T05:05:50.695462+00:00 obs3 irc[26494]: 30 r://irtc_20111104.20111104.00085_cube.fits
2011-11-04T05:06:11.210875+00:00 obs3 irc[26582]: OffsetPoiting ANGLE=0. OffRA=-5. OffDEC=-5. Sys=DETXY OPE=MOUNT NP=true Move=ABS Side=left
2011-11-04T05:07:22.653014+00:00 obs3 irc[26812]: 30 r://irtc_20111104.20111104.00086_cube.fits
2011-11-04T05:07:43.368219+00:00 obs3 irc[26903]: OffsetPoiting ANGLE=0. OffRA=5. OffDEC=5. Sys=DETXY OPE=MOUNT NP=true Move=ABS Side=left
2011-11-04T05:08:54.718843+00:00 obs3 irc[27133]: 30 r://irtc_20111104.20111104.00087_cube.fits
2011-11-04T05:09:15.783491+00:00 obs3 irc[27221]: OffsetPoiting ANGLE=0. OffRA=0. OffDEC=0. Sys=DETXY OPE=MOUNT NP=true Move=ABS Side=left
2011-11-04T05:10:26.876438+00:00 obs3 irc[27454]: 30 r://irtc_20111104.20111104.00088_cube.fits
2011-11-04T05:10:47.681042+00:00 obs3 irc[27543]: OffsetPoiting ANGLE=0. OffRA=-5. OffDEC=5. Sys=DETXY OPE=MOUNT NP=true Move=ABS Side=left
2011-11-04T05:11:59.170496+00:00 obs3 irc[27773]: 30 r://irtc_20111104.20111104.00089_cube.fits
2011-11-04T05:12:19.723457+00:00 obs3 irc[27861]: OffsetPoiting ANGLE=0. OffRA=5. OffDEC=-5. Sys=DETXY OPE=MOUNT NP=true Move=ABS Side=left
2011-11-04T05:13:31.174334+00:00 obs3 irc[28094]: 30 r://irtc_20111104.20111104.00090_cube.fits
2011-11-04T05:13:53.287075+00:00 obs3 irc[28182]: OffsetPoiting ANGLE=0. OffRA=-5. OffDEC=-5. Sys=DETXY OPE=MOUNT NP=true Move=ABS Side=left
2011-11-04T05:15:05.306253+00:00 obs3 irc[28415]: 30 r://irtc_20111104.20111104.00091_cube.fits
2011-11-04T05:15:26.786528+00:00 obs3 irc[28509]: OffsetPoiting ANGLE=0. OffRA=5. OffDEC=5. Sys=DETXY OPE=MOUNT NP=true Move=ABS Side=left

Quicklook Analysis

JMH: These are eyeball centroids from ds9(not precisely measured) to check the direction of motion. At least on 20111109 the cubes are in /newdata/warning/

CUBE IRTC_X IRTC_Y
78 177 137
79 225  89
80 130 188
81 128  91
82 226 184
83 178 138
JMH: The result is that X in the DETXY offset corresponds to IRTC_Y, and Y corresponds to IRTC_X. This 90 degree rotation is as we expected since the window in front of IRTC is still rotated by 90 deg as it was for AGW2 commissioning at RFBG.

Close

05:18 Wind has been increasing steadily and approaching the limits. We closed preemptively as we're seeing gusts of ~19m/s.

05:30 - wind now gusting over the 20m/s limit and increasing clouds, not looking good for the rest of the night.

-- JochenHeidt - 04 Nov 2011
Topic attachments
I Attachment Action Size Date Who Comment
transform.datdat transform.dat manage 5 K 04 Nov 2011 - 04:00 JohnHill Stone O Transformation Data File (output from transform_process_set)
Topic revision: r14 - 06 Dec 2011, JohnHill
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