AGw Commissioning with IRTC 07-08 November 2008 MST

Observers: A. Rakich, D. Miller and J. Hill (at beginning) in Tucson, Nancy in Germany
Operator: A. Ceranski

Summary

Telescope problems with HBS. Lost 3 hours.

Tested new "Smart Zernikes" routine in GCS. Work fine and pretty sure sped up collimation time. One correction is GCS needs to determine RMS WFE in primary zernike units, not in from the scaled zernikes sent to the primary.

Andrew did see that even with good seeing and well collimated telescope (<200 nm WFE), the ActOpt occasionally would measure one WFSC image with 400-500 WFE. If these corrections were not sent to PSF, the next few WFS images would again have <200nm WFE. Why are we occasionally seeing spurious aberrations? Vibrations and jumps, I would think, would show up at tip/tilt, and those modes we don't care about.

Remeasured the IRTC focus position for the AGw probe stage. We had measured ~31mm last week, but last night it appeared that 3 or 4 mm less looked better. We took a set of in-focus images after collimating at 5 AGW probe positions with the IRTC. We also took EF pairs at 5 AGw stage focus positions. Both looked like 4 mm less (27mm) was a better focus

Just before sunrise we pointed at Saturn. We guided and collimated on Titan and got some really nice (2 color + empty filter) images of Saturn. Saturn's ring just fit diagonally on the IRTC.

Seeing was great ~0.4 to 0.6 most of the night. Around 4:30 it jumped up to 1.2-1.5.

Details (Times reported in MST below)

Telescope won't move

Telescope problems with HBS. Lost 3 hours.

Aaron reset the encoders at the end of this, but didn't restart PCS.

On-sky

Sky is photometric. T=4degC.

21:00 pointto BS9188 had a rotator fault

21:05 pointto BS9188 gs=0 ACQUIRE - succeeded but didn't find star.

21:10 pointto M5_0881 TRACK

IRAF fails with semi-persistent can't write to uparm$pipe messages

Kill IRAF window and restart. (We don't know the cause of this message, or why this is the cure.)

21:26 cl < home$spiral.cl. Found at offset 60 30

21:32 Adjust IE=-25 CA=-78

21:40 Adjust M1 Zglobal=0 (to get back to default collimation focus).

Testing GCS with "smart Zernikes" through Z22

21:42 pointto BS9188 gs=0 ACTIVE - succeeded. Guider image is 0.5 arcsec after a few active optics iterations with GCS (through Z11).

21:44 gsc_wfsc_display

21:53 divert active corrections to "default"

21:59 Update Zernike scale factors for GCS so they match IDL through Z22. This change in /lbt/tcs/current/etc/GCS/AIP_L_rm_sub11.cfg.

22:00 pointto BS9188 gs=0 ACTIVE - succeeded. Note some apparent oscillation between Z11 and Z22, but otherwise GCS is running OK with the Z12-Z22 terms being sent. (at the +-100 nm level in Z11)

22:09 Now Z8 and Z16 seem to be oscillating together, also Z7 and Z17. Should we lower the gain factor on the high order coefficients below 0.5 that it presently is?

22:13 Have diverged significantly in focus. See wfsc 0028 +- It looks like the secondary is not moving.

22:19 Andrew opened the PSF Wavefront GUI, and then the secondary updated. ???

22:19 Bad new forces error on M1 (Events on PSF GUI)

22:22 Clear C00 on primary forces.

Aaron reports that first bad forces error happened at 22:09 on PMCL GUI. We think the lack of focus update is caused by this error which causes PSF to end its adjustments to everything else.

22:31 wfsc 0046 lenslet images look like beans in different orientations. Local seeing?

22:32 Applied new coefficients with gain 0.1 on Z12-Z22 terms.

22:37 Clear active optics on M2, and secondary offload, but not active optics on M1. This gives us a healthy (ugly) residual coma and focus to digest.

22:37 pointto BS9188 gs=0 ACTIVE starting at wfsc 0053. It switches to Z4-Z11 after 5 iterations of Z4,Z7,Z8.

Doug: Make plots of the convergence for this set starting at wfsc 0053 with 0.1 gain compared to the previous set with 0.5 gain.

22:50 False Z17 is appearing when there is residual Z7.

22:53 Jump in Z8, Z10 in wfsc 0065

22:55 Switch off the Z12-Z22 corrections in both IDL and GCS (by setting the threshold to zero) to proceed with other experiments.

23:00 Clear active optics everywhere

23:01 pointto BS9188 gs=0 ACTIVE starting with wfsc 0074.

23:08 offloading ~200" from M2 to m1 with stepfocus

23:17 failing to converge, had converged well at wfsc 83, then jumped to 400 nm (wfsc 84) then fails to converge below 300 nm by wfsc 90, jumps to 500 nm @ 91

23:25 so we were at 57 elevation at that point, going to a higher elevation 73 (BS9107) degrees to see if it converges better (dome seeing?)

23:35 have converged to very nice WFE of < 200 nm now starting redetermination of scale factor, seeing ~ 0.5"

23:36 resend preset in guide mode

23:41 collimating in IDL (in /Repository/AGW_Data/081108) wfsc 04-05 good, then jump at 06 to 345 nm

23:46 coming back down wfsc 07-09, 10 seemed to jump, didn't send see 11 much better, whats going on there? (Doug).

23:51 collimated driving in 1000 nm Z4 (M1 Z went from -.341 to -.303, change of 38 microns as expected) wfsc 13-15, Z4 -> 525 nm , 563 nm, 624 nm

23:56 remove 1000 nm Z4, collimate in IDL, but unexpectedly large errors in wfsc 16, do not send, repeat, even worse errors in 17 and 18, send 18 to primary, have decided to start again...

00:00 collimating in idl wfsc 19-21, didn't send 22, seemed to jump, 23 sent 24 not sent, 25 sent, 26 sent (<200 nm), 27 sent. have decided that this star is too near meridian at zenith, focus changing 200 nm in sme direction each iteration, gonig to try a star at 62 degrees elevation, BS9108

00:15 running an IDL collimation loop wfsc 28-35

00:24 sent 2000 nm Z4 multiple 3 wfsc 36-38, 1372, 1234, 1219 nm

00:26 back to zero z4 wfsc 39 very low focus, now -2000 wfsc 40-42z4, -1647, -1673, -1654 nm Z4 measured

00:29 back to zero Z4, collimate wfsc 43-45

00:34 back to +2000 Z4, wfsc 46-48 Z4 = 1214, 1215, 1240

00:36 back to Z4 = 0, collimate wfsc 49-50

00:38 back to -2000 nm Z4, wfsc 51-53 Z4= -1505, -1452, -1452

00:39 back to Z4 = 0, collimate wfsc 54-55

00:42 Z4 -> +1000, wfsc 56-58, Z4 = 619, 647, 654

00:44 going back on axis, collimating wfsc 59-62

00:49 going to -1000 Z4, wfsc 63-65 Z4 = -666, -733, -656

00:52 back on ais collimate wfsc 66-79

01:10 going to M5_0151 (GS 1) for EF determination of AGW-IRTC offset

1:20 took cube of 1000 2ms exposures (focus_02_cube.fit) , have decided we need at least 6 s though so going to 3000 exposure cubes. focus_03_cube.fit. AGW Z position 30.661 mm

1:25 setfocus 27.661 mm take sequence focus_04_cube.fit

1:39 setfocus 24.661 mm take sequence focus_05_cube.fit

1:44 setfocus 21.661 mm take sequence focus_06_cube.fit

1:55 setfocus 18.661 mm take sequence focus_07_cube.fit lost guiding sometime before 2:02, reset and redo...focus_08_cube.fit

2:15 adjust IE CA to -44 -83

2:29 gone to 33.666 mm take sequence focus_09_cube.fit

2:59 stop guiding and collimation

2:59 offset 0 30 takseq of background 0.002X3000 focus_10_cube.fit

3:20 pointto m5_0258 no guide star, Track and set IE=-40, CA=-65

3:27:28 pointto m5_0258 ACTIVE GCS died unexpectedly

3:28 Aaron restart

3:28 pointto m5_0258 success collimate wfsc 174-177

3:33 stop guiding

3:34 cl<inex_seq.cl 0.1 sec x 300

probe focus in ex exp frames Focus from EF
29.34 ef_11 ef_12 0.1 300 534
26.34 ef_13 ef_14 0.1 300 366
23.34 ef_15 failed      
23.34 ef_18 ef_19 0.1 300 17
20.34 ef_16 ef_17 0.1 300 -400
17.34 ef_20 ef_21 0.1 300 -550
BG ef_22 -- 0.1 300  

4:35 Seeing 1.2+. Scrap plans to take field aberration data till night with <.8 seeing

4:45 pointto M5_1311 set IE and CA, 28 elevation Collimate

5:15 Test IDL Presets, and Cool image of Saturn

5:30 irc_preset_guide (IDL presetTelescope) to Saturn with Titan as guide star

5:45 Find Saturn and Titan, set PA to -45 for correct angle and set IE and CA to get rings on chip

J 23 0.02 100
H 24 0.02 100
None 25 0.006 100
None 26 0.01 100
H 27 0.02 100
H 28 0.04 100
J 29 0.04 1000
J 30 0.08 100
? 31    
BG J 32 0.08 100
BG J 33 0.04 100
BG J 34 0.02 100
BG H 35 0.02 100
BG H 36 0.04 100
BG H 37 0.08 100
BG None 38 0.01 100
BG None 39 0.006 100

-- JohnHill - 08 Nov 2008
Topic revision: r5 - 11 Nov 2008, DougMiller
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