Commissioning Notes from 20th-21th June 2008 MST

Observers: D. Miller, A. Rakich (in Tucson), J. Storm (at LBTO).
OSA: A. Ceranski

Summary

Night time Activities

(Times are in MST)

Collimation Values

8:00 pointto BS9166 Star not in field. the pointing offsets were removed with the shutdown of the telescope. Star found and here are the parameters:

Coma Free Pointing: Tip = 45, Tilt = 15

Total Collimation 0.438, -1.312 1.759 34.888, -14.263, 0

*** Pointing Model Terms ***
IA      -286.93580
IE       -75.00000
NPAE      17.99860
CA       -65.00000
AW         5.10060
AN        24.39890
TF        21.06980

Global Offsets x = -1 Ry = 20 (needed to keep primary away from x limit at 2.5 at low elevation)

To move primary away from +X limit, need Delta_x=-1 and Delta_Ry = 20 in global offsets. To change these while guiding, put in delta_x = -1 and Delta_Ry = 10. Star stays put. Now add Delta_Ry =1 and update in 10 steps till Delta_Ry total = 20. QED!

8:30 Johannes having trouble with DIMM. Tip over so he can wiggle something

8:45 Cannot talk to TCS through IIF. Aaron restart CSQ (make IssueTrak) and restart irs. Works now.

8:47 pointto BS9166

8:58 ./triggerWFS:

Jun 21 20:58:56 lbtmu107 LBT_left_GCS: PROFILING: WFS: triggerWFS() entered.
Jun 21 20:58:56 lbtmu107 LBT_left_GCS: PROFILING: WFS: requesting image...
Jun 21 20:59:28 lbtmu107 LBT_left_GCS: WFS: intending to wait 37659 ms for the WFS image.
Jun 21 20:59:28 lbtmu107 LBT_left_GCS: fatal error: triggerWFS: WFS image didn't arrive within timeout of 37659 ms.
Jun 21 20:59:28 lbtmu107 LBT_left_GCS: GCSL:triggerWFS execution time: 32231 ms at 1214107168526

Crap, I had used IDL to get image.

9:01 pointto BS9166

9:02 ./triggerWFS

Jun 21 21:02:26 lbtmu107 LBT_left_GCS: PROFILING: WFS: calculating Zernikes...
Jun 21 21:02:26 lbtmu107 LBT_left_GCS: WFS: readFlatVector: Elements = 338
Jun 21 21:02:26 lbtmu107 LBT_left_GCS: WFS: calibration vector read
Jun 21 21:02:26 lbtmu107 LBT_left_GCS: WFS: readReconMatrix: Width = 338  Height = 21
Jun 21 21:02:26 lbtmu107 LBT_left_GCS: WFS: ReconMatrix(col:003, row:010) = 0.000054
Jun 21 21:02:26 lbtmu107 LBT_left_GCS: WFS: ReconMatrix(col:010, row:003) = -0.000140
Jun 21 21:02:26 lbtmu107 LBT_left_GCS: WFS: Reconstruction matrix read
Jun 21 21:02:26 lbtmu107 LBT_left_GCS: WFS: 4 corner's mean background is : 1136.58
Jun 21 21:02:27 lbtmu107 LBT_left_GCS: WFS: slopeAverage: final xCenter = 394.88, yCenter = 260.82
Jun 21 21:02:27 lbtmu107 LBT_left_GCS: WFS: WFS image analyzed.
Jun 21 21:02:27 lbtmu107 LBT_left_GCS: WFS: calculated Zernikes for /tmp/wfscimage000050.fits are
Jun 21 21:02:27 lbtmu107 LBT_left_GCS: WFS: z(02) = 748.4746
Jun 21 21:02:27 lbtmu107 LBT_left_GCS: WFS: z(03) = -504.7158
Jun 21 21:02:27 lbtmu107 LBT_left_GCS: WFS: z(04) = -116.8962
Jun 21 21:02:27 lbtmu107 LBT_left_GCS: WFS: z(05) = 213.2105
Jun 21 21:02:27 lbtmu107 LBT_left_GCS: WFS: z(06) = -369.7097
Jun 21 21:02:27 lbtmu107 LBT_left_GCS: WFS: z(07) = -369.7326
Jun 21 21:02:27 lbtmu107 LBT_left_GCS: WFS: z(08) = -958.9776
Jun 21 21:02:27 lbtmu107 LBT_left_GCS: WFS: z(09) = 37.4780
Jun 21 21:02:27 lbtmu107 LBT_left_GCS: WFS: z(10) = -72.6311
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: z(11) = -593.1973
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: z(12) = 68.9487
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: z(13) = -57.2088
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: z(14) = -58.8587
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: z(15) = 40.2174
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: z(16) = 262.6806
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: z(17) = 99.9867
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: z(18) = 14.1752
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: z(19) = 6.6725
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: z(20) = -74.5590
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: z(21) = -20.0077
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: z(22) = 297.8197
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: rotator angle mcs.rotatorSide[0].rotators[2].actualPositionASec reported to be 237.49 degrees
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: adjusted by offset angle, the PM rotation is -73.49 degrees.
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: Zernike rotation by -73.49 degrees
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: rotated Zernikes for /tmp/wfscimage000050.fits are
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: z(02) = 696.6408
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: z(03) = 574.1462
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: z(04) = -116.8962
Jun 21 21:02:28 lbtmu107 LBT_left_GCS: WFS: z(05) = -380.2602
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS: z(06) = 193.7683
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS: z(07) = -1024.5151
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS: z(08) = 81.9087
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS: z(09) = 18.6171
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS: z(10) = 79.5819
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS: z(11) = -593.1973
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS: z(12) = -26.6280
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS: z(13) = 85.5436
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS: z(14) = 12.8645
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS: z(15) = 70.1162
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS: z(16) = -21.1999
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS: z(17) = 280.2659
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS: z(18) = -6.4552
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS: z(19) = -14.2754
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS: z(20) = -71.3433
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS: z(21) = -29.4870
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS: z(22) = 297.8197
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: PROFILING: WFS: Zernikes calculated.
Jun 21 21:02:29 lbtmu107 LBT_left_GCS: WFS:writing description for WFS image to: /tmp/wfscimage000050.txt
Jun 21 21:02:30 lbtmu107 LBT_left_GCS: PROFILING: WFS: leaving triggerWFS().
Jun 21 21:02:30 lbtmu107 LBT_left_GCS: GCSL:triggerWFS execution time: 36210 ms at 1214107350447

9:05 Collimate. Primary hard point trouble. Aaron press collimate primary a few times: OK. Collimate

NEW Collimation Values

9:15 roll in a total TIlt on M2 of +35, so now TIp = +45, Tilt = +35, IE= -100, CA = -67

[The above values were used to update the primary and secondary collimation models, as well as the pointing model for IRTC. These are the models dated 20080830. They also serve as the starting point for the initial LUCIFER on-sky tests. - JMH 30-Aug-2008]

1:30 following cloudy spell and some data acquisition for Jesper, going to BS9166 collimating on axis.wfsc 40-cloud

2:35 Cloud has rolled in but through the cloud strange things have been happening with the SX PM. WE were observing a low down star (9166) and found at one point that active optics had driven the mirror to its negative x-limit. Aha we thought, we can just roll that out with a change in the global offsets, and furthermore we should be able to keep guiding lock by rolling dX 1 mm and Ry 10", the zero pointing combintaiton, then stepping Ry the remaing 10" for zero coma combination 1" at a time.

So we did that and found no star. Cloud is a distinct possiblity here, however, this does not explain the following. Desparing of finding our star we decided to roll the global offsets back to their original positions and then move off to another star at a higher elevation. What was really surprising was that when we set the global offsets back to where they had been (while still tracking BS1966) we were now ~1.5 mm clear of the negative x-limit that we had previously been up against. Furthermore, when we went up to a higher star (which we caught occasional glimpses of through dense but patchy cloud, we couldn't find our star, and a spiral search located it with an offset of ~30 arc seconds.

Once we had adjusted pointing to clear the offset we found a delta IE of -15 and a delta CA of +25 to bring our star back on the hotspot. So, why is this? Did we lose motion when we hit the x-limit. One for the issuetrak after I've had a chance to check with John and/or Chris.

[It often happens that active optics piles up excess correction when the primary mirror is up against the limit and you don't notice for a few corrections. Then when you move off the limit by global offsets or changing elevation you have over-corrected the coma. I suspect that this is what happened above, although I can't rule out clouds. It could also be that some PSF pointing corrections got cleared while you were adjusting the global offsets. - JMH 08-July-2008]

-- DougMiller - 22 Jun 2008
Topic revision: r6 - 31 Aug 2008, JohnHill
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