16-17 October 2008

Observers: DThompson, ARakich, JHill (from Tucson), LUCIFER folks (N.Ageorges,W.Seifert, et al)
Software Support: PGrenz, TEdgin (from Tucson)
Telescope Operators: ACeranski

Summary

Details

UT 01:45 Pointing corrected. Initial collimation ran into +y limit on M1. Offsets of -1mm in Y applied to both M1 and M2. Tout=8.1C, Tprimary=8.4C.

Needed to do a selectAGW and home the AGW stages.

First on-axis preset failed (acq#252). Star visible at the bottom of the acq.image, ~400 counts above background and heavily comatic. Per Norm Cushing - A known feature of the guiding acquisition algorithm is that it will not see a star at the very bottom of the acquisition image. This will be fixed in a later version of the GCS.

Now running close to the -Y limit on M1 during the initial collimation with the WFS. Stop guider and wfs, enter global offsets of +1mm Y on both M1 and M2. Resend preset.

Again ran into -Y limit. Offset another +2 mm (current global Y offsets are M1=4.0, M2=-1.7).

Global offsets were off. Reset manually to M1y=+1, M2y=-3.7
GCS ran into limit. Changing global offsets to M1y=+2, M2y=-2.7
GCS ran into limit again. Changing global offsets to M1y=+3, M2y=-1.7 - GCS collimated the telescope. Total M1 Y is now -1.7

BS9188 preset sent via iraf, PA=230.04, gs=14 failed, although the star was at the top of the acq.image (#262). Resent preset on-axis (succeeded, acq#263).

pointto BS9188 gs=0 luci_20081016_0063

seeing got significantly worse! UT3:55 closing, weather coming in?

Close

See long, narrow green "spike" on radar_plot.jpg. It was moving pretty fast towards us, and persistent over many consecutive radar images.
radar_plot.jpg

Reopen, Trying to measure whether astigmatism rotates with WFS relative

07:25 UT Reopen after the radar echo is gone by. Seeing on Polaris monitor is back to 1 arcsec. Humidity is low. Sky is clear.

07:28 pointto BS9108 gs=0 ACTIVE but no star on acquisition frame

07:32 pointto BS9107 gs=0 ACTIVE

07:36 pointto BS9107 gs=0 TRACK PAM-

IE=-25.8 CA=-34.6 odd values?

07:45 pointto BS9107 gs=0 ACTIVE but GCS thinks star is too dim for WFS

07:49 pointto BS9107 gs=35 ACTIVE but LUCIFER had centered on the brightest star which is not the central one

07:56 pointto BS9107 gs=0 TRACK PAM-

IE=-27.95 CA=+3.72

08:00 pointto BS9107 gs=35 ACTIVE PA=315.8

08:04 Stop WFS after convergence

08:06 Restart WFS as LUCIFER saw some elongation in the first cube. Guide images are 0.5 to 0.6 arcsec

08:10 Seeing gets worse -> 1.5 arcsec for a few minutes

08:12 Stop WFS

08:13 luci_20081016_0072 in focus

08:15 Z4=+2000 0073

08:16 Z4=+1000 0074

08:17 Z4=0000 0075

08:19 Z4=-1000 0076

08:20 Z4=-2000 0077

08:23 Clear C00 and start WFS

08:27 Stop WFS 0078 in focus

08:28 Z4=+2000 0079

08:31 Z4=+1000 0080

08:32 Z4=0000 0081

08:33 Z4=-1000 0082

08:35 Z4=-2000 0083

08:38 Z4=-3000 0084

Are we seeing hysteresis in the focus motion? Why does best focus seem to be at -1500 nm Z4

08:42 pointto BS9107 gs=35 ACTIVE PA=0.81 to rotate the WFS relative to LUCIFER now

08:46 Stop WFS 0085

Small interlude to discuss 08:54 Z4=+2000 0086

08:56 Z4=+1000 0087

Sequence interupt

08:58 Start WFS

09:00 pointto BS9107 gs=35 ACTIVE PA=30.81 but star went off corner of acq image

09:06 pointto BS9107 gs=35 ACTIVE PA=240.81

09:08 pointto BS9107 gs=35 ACTIVE PA=315.81 GCS stuck for minutes after 02:08:39

09:12 Kill GCS

Center was drifting because we are at EL=85 deg.

09:16 pointto BS9108 gs=0 TRACK PAM-

09:21 pointto BS9108 gs=21 TRACK PA=INDEF=95.22

09:23 pointto BS9108 gs=21 ACQUIRE PA=5.22 (out of range)

09:25 pointto BS9108 gs=21 ACQUIRE PA=15.22 Probe moved but GCS never took acq image + Preset succeeded?

09:29 Kill GCS and restart (Sorry operator error.) It did just what I asked.

09:29 pointto BS9108 gs=21 ACQUIRE PA=15.22

09:31 pointto BS9108 gs=21 ACTIVE PA=15.22

09:36 Stop WFS

09:37 Z4=+2000 0089 (astig ~vertical)

09:38 Z4=0 0090

09:39 Z4=-2000 0091 (astig ~horizontal)

09:41 pointto BS9108 gs=21 ACTIVE PA=175.22 (offset landed in corner of guide box)

09:45 stop WFS

09:46 Z4=+2000 0092 (astig ~vertical)

09:47 Z4=0 0093

09:50 Z4=-2000 0094 (astig ~horizontal)

LUCIFER Tests for correction versus guide star position

Nancy reports less image elongation here, but then WFS hung.

Oct 17 03:07:57 lbtmu107 LBT_left_GCS: WFS: timeout while waiting to issue a requestImage command. trying again...
Oct 17 03:07:57 lbtmu107 LBT_left_GCS: PROFILING: WFS: triggerWFS() entered.
Oct 17 03:07:57 lbtmu107 LBT_left_GCS: PROFILING: WFS: requesting image...
Oct 17 03:07:57 lbtmu107 LBT_left_GCS: WFS: requesting a WFS image...
Oct 17 03:08:36 lbtmu107 LBT_left_GCS: WFS: timeout while waiting to issue a requestImage command. trying again...
Oct 17 03:08:36 lbtmu107 LBT_left_GCS: PROFILING: WFS: triggerWFS() entered.
Oct 17 03:08:36 lbtmu107 LBT_left_GCS: PROFILING: WFS: requesting image...
Oct 17 03:08:36 lbtmu107 LBT_left_GCS: WFS: requesting a WFS image...

10:10 Send preset again

Total X=-0.338 Y=-0.511 Z=+0.111 RX=-16.79 RY=-11.46 EL=83.1 T=+8.70

The following is the second instance of this error:

Oct 17 03:45:47 lbtmu107 LBT_left_GCS: Offset in SFP mm (calculated by GCS with derotation) is: 5.072760, 6.456400
Oct 17 03:45:47 lbtmu107 LBT_left_GCS: PROFILING: adjusting for star offset from hotspot...
Oct 17 03:45:47 lbtmu107 LBT_left_GCS: sending PCS a correction to put star on hotspot
Oct 17 03:45:47 lbtmu107 LBT_left_GCS: pcsClient.guider.updateGuideOrigin(-5.115605,-6.423127);
Oct 17 03:45:58 lbtmu107 LBT_left_GCS: timed out after 10 seconds waiting for the PCS to accept initial guide correction
Oct 17 03:45:58 lbtmu107 LBT_left_GCS: GCSL:startGuiding execution time: 17813 ms at 1224240358387

Oct 17 03:48:31 lbtmu107 LBT_left_GCS: Offset in SFP mm (calculated by GCS with derotation) is: 5.773923, 6.164979
Oct 17 03:48:31 lbtmu107 LBT_left_GCS: PROFILING: adjusting for star offset from hotspot...
Oct 17 03:48:31 lbtmu107 LBT_left_GCS: sending PCS a correction to put star on hotspot
Oct 17 03:48:31 lbtmu107 LBT_left_GCS: pcsClient.guider.updateGuideOrigin(-5.814019,-6.131603);
Oct 17 03:48:42 lbtmu107 LBT_left_GCS: timed out after 10 seconds waiting for the PCS to accept initial guide correction
Oct 17 03:48:42 lbtmu107 LBT_left_GCS: GCSL:startGuiding execution time: 18105 ms at 1224240522448

Oct 17 03:48:31 lbtmu102 LBT_PCS: PCS:GUIDER:UpdateGuideOrigin executed
Oct 17 03:48:31 lbtmu102 LBT_PCS: Guider. Updated Origin Xmm: -5.81402 Ymm: -6.1316
Oct 17 03:48:42 lbtmu102 LBT_IIF: IIF:Preset execution time: 52635 ms at 1224240522484
Oct 17 03:48:52 lbtmu102 LBT_PCS: PCS:GUIDER:UpdateGuideOrigin execution time: 20941 ms at 1224240532859

Star was at 113,66 on acquisition image 284.

Recenter star and preset again. IE=-27.95 CA=-14.28

Oct 17 03:57:50 lbtmu107 LBT_left_GCS: deleting _azcam instance
Oct 17 03:58:00 lbtmu107 LBT_Networkserver: GCSL died unexpectedly
Oct 17 03:58:00 lbtmu107 LBT_Networkserver: GCSL is not active
Oct 17 03:58:00 lbtmu107 LBT_Networkserver: dropping GCSL

Restart GCS and preset again, and it works.

Rotation Center on LUCIFER 1030,1035.

GCSL: Why is the threshhold so high?:
Oct 17 04:38:59 lbtmu107 LBT_left_GCS: full CCD read out received.
Oct 17 04:38:59 lbtmu107 LBT_left_GCS: hotspot is 289.000000,252.000000.
Oct 17 04:38:59 lbtmu107 LBT_left_GCS: PROFILING: searching for star in full CCD readout...
Oct 17 04:38:59 lbtmu107 LBT_left_GCS: windowsize around hotspot is 80.
Oct 17 04:38:59 lbtmu107 LBT_left_GCS: subtracting background noise for WWPA guide image: 1303
Oct 17 04:38:59 lbtmu107 LBT_left_GCS: WWPA centroid close to image center, verifying star does exist...starpix = 5.00
Oct 17 04:38:59 lbtmu107 LBT_left_GCS: star was not bright enough in center(290,249) to be accepted: count = 0, threshold = 1075052544

Cannot get a guide star here (EL~82). See acq#289, star is close tro 100 DN above background in the peak.

Moving to BS9107

Checking guider image for astigmatism. Collimate, then turn off wfs and dial in aberrations by hand. Guiderimages:
020110-20120 collimated
20121-20127 +2000nm Z4
20129-20135 -2000nm Z4
20138-20149 +2000 Z4 and...(focus kept in)
20153-20157 +2000nm Z5
20159-20163 -2000nm Z5

Turn WFS back on to recollimate...

20200-20230 collimated
20237-20241 +1000nm Z5
20243 back toi zero Z5
20245-20250 +2000nm Z4
20252-20258 +1000nm Z5 (obvious)
20261-20269 -1000nm Z5 (obvious, other direction)

Clear coeffs, WFS to recollimate...

BS9107_GS27 to get things collimated with off-axis star.
+2000nm Z4 to defocus

Seeing is too bad to do this test. Turned over to LUCIFER for remaining night.

-- DavidThompson - 09 Oct 2008
Topic revision: r7 - 19 Oct 2008, JohnHill
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