RFBG Commissioning with Adaptive Secondary - 29 March 2010 UT

Night 10:

Observer: JHeidt, FBian (LBTO)
Telescope Operator: DHuerta
Software: TEdgin
Instrument Support:: TShih
Telescope Support: JUrban
Adaptive Support: GBrusa (LBTO)

Summary

Weather was photometric, but seeing unfortunately very unstable fist 2/3 of the night and stable (around 1") towards the end

Spend a lot of time on collimation issues. Collimation problems seems to be solved, but:
- when moving from on target to another, collimation is heavenly lost
- collimation is very slow and rarely goes below 300 RMS

- Had hope to do field aberration measurements, but finally didn't succeed

- Got a good set of transformation data (50+ measurements)

- Some collimation model measurements (~10)

Preparations

Single frame names refer to: irtc.20100329.xxxxxx.fits

Cube names refer to: irtc.20100329_00xxx_cube.fit

Torsten implemented a new patch of the GCS, check if collimation works properly now.

Plan for the night: Do a large set of transformation data if collimation is OK, collect field aberration measurements (40" tip)

Details

Open

01:48 Open, clear (photometric), T_out = 3C, T_Mirror = -5.0C, Hum = 45%, no wind

Initial Pointing and Collimation Adjustment

Each night in this RFBG commissioning run, we go to a bright star (Pollux) at Elevation 80 degrees. Then we adjust the vertex tip-tilt (RX/RY) of the secondary to get rid of the coma that we see in the extrafocal pupil on the IRTC.

01:57 pointto Pollux gs=0, TelM = track, PAMode=no, no star, adjust to yesterday values (CA=-77, IE=-48), EL = 78, OK, star there, adjust *CA=-60 ,IE=-29*
DX M2 Global X = 2.5, Y = -3.63, Z = 1.9, RX = -360, RY = -120 , coma, adjust to X = 2.3, Y = -2, Z = 2.4, RX = -520, RY = -145

02:20 pointto M5_1210 gs=0, TelM = track , EL = 26, AZ = 170, at very-low elevation to adjust AZ-zeropoint, pointing OK, star found, Adjust IA = -386, keep IE=-49, CA = -71. Coma, Adjust global offsets to:
DX M2 Global X = 2.3, Y = -1.0, Z = 2.95, RX = -620, RY = -145, looks good!

JMH/AR: Why was coma adjusted by translating the secondary? This messes up the binodal astigmatism alignment. Coma at the beginning of the night should be adjusted with M2 vertex tip-tilt as detailed in the log above.

02:37 pointto BS9134, GS=0, TelM=active, GCS is not responding, called Thorsten, restart GCS, preset again in acquire-mode to allow David to focus, OK

02:48 pointto BS9134, GS=0, TelM=active, strong astigmatism, collimation, guider reports 0.8-0.9", RMS@WFS < 200

Check if GCS-fix for X-axis collimation problem is OK

02:58 pointto BS9134, GS=9, TelM=active, PA=INDEF, (sets PA=302.34), collimation diverges, calling JHill, clear active optics and redo

03:09 pointto BS9134, GS=0, TelM=active, collimates, RMS@WFS < 200

03:14 pointto BS9134, GS=9, TelM=active, collimation diverges again, John is calling Doug to see what happened....

03:26 pointto BS9134, GS=0, TelM=active, to let it collimate, cleared active optics before

03:30 John changes WFS_pupil_DIR_y from +1 to -1, restart GCSR

JMH: I don't understand why this sign changed with the new build of GCS.

03:33 pointto BS9134, GS=0, TelM=active, to collimate again on-axis

03:42 pointto BS9134, GS=9, TelM=active, PA=indef, collimates on y-axis

03:47 pointto BS9134, GS=9, TelM=active, PA=260, collimates

03:52 pointto BS9134, GS=9, TelM=active, PA=240, does not collimate properly

04:02 pointto BS9134, GS=9, TelM=active, PA=indef, seems to collimate

04:06 pointto BS9134, GS=9, TelM=active, PA=260, does not collimate properly

04:22 John/Doug changed WFS_ProbeRotationFactor from -1 to +1 , restart GCSR

JMH: This one seems to be simply collateral damage from the confusion on the previous night, and it didn't get put back to the correct value.

04:23 pointto BS9134, GS=9, TelM=active, PA=260,

04:36 switched to collimation via IDL, stopped WFSing at GCS gui, some zernikes are running away

Conclude that IDL also needs the probeRotationFactor (or equivalent variable) reversed since Z9/Z10 are diverging when we are off the Y-axis. Doug fixed this the following day.

04:44 pointto BS9134, GS=9, TelM=active, PA=260, seems to be OK now

04:53 pointto BS9134, GS=0, TelM=active, collimate, guider reports 1.5-2.5"

Collimation model observations

since seeing is bad (1.5-3"), single image = 0.1, cube = 10*0.1 sec

05:30 pointto M5_0328, GS=3, TelM=active, EL= 65, RMS@WFS~200-300, 054022 cube 22 (Off-axis)

05:40 pointto ACT0305, GS=0, TelM=active, too bright

Using Persson Stds from now on

since seeing is bad, single image = 2, cube = 10*2 sec

05:50 pointto C11+20, GS=0, TelM=active, EL=75, no star?

05:54 pointto BS9148, GS=0, TelM=active, EL=75, star at edge, redo in acquire-mode, CA=-48, IE=-40, redo in active mode
H, 060725 cube 23, 0.1sec, RMS@FWS ~ 300
H, 060848 cube 24 2sec, OK
J, 060940 cube 25

06:11 pointto BS9143, GS=0, TelM? =active, EL=60, RMS@WFS ~200
H, 061944 cube 26
J, 062022 cube 27

06:20 pointto C11-15, GS=0, TelM=active, EL=42, RMS@WFS ~200
H, 062909 cube 28
J, 062951 cube 29

06:35 pointto C11-27, GS=0, TelM=active, EL=30, adjust pointing, CA=-63,IE=-43, RMS@WFE ~350
H, 064725 cube 30
J, 064810 cube 31

06:49 pointto C11-36, GS=0, TelM=active, EL=20, hit limits after while, David took care of that, RMS@WFS ~ 350, guider reports ~1.4"
H, 0700343 cube 32
J, 070435 cube 33

JMH: It looks like David had the right idea to translate both M1 and M2 in parallel after hitting the limit. But something got confused and he moved them by different amounts. This means that the following collimation data isn't very useful. (The focus term, Z, may still be good.)

next images have 0.1sec (single), 10*0.1 (cube)

07:06 pointto C11-27, GS=0, TelM=active, EL=28, RMS@WFS ~ 200
H, 071228 cube 34

07:12 pointto C11-15, GS=0, TelM=active, EL=40, RMS@WFS ~ 300
H , 072025 cube 35

07:20 pointto BS9143, GS=0, TelM=active, EL=50, RMS@WFS ~ 250
H, 072601 cube 36

07:26 pointto C11+30, GS=0, TelM=active, EL=75, RMS@WFS ~ 380
H, 073532 cube 37

07:33 pointto BS9143, GS=0, TelM=active, EL=50, RMS@WFS
H, 074518 cube 38

loosing collimation practically after every preset, takes a while to recollimate again! RMS@WFS mostly starts above 2000, star on guider screen looks always ugly!

Field Aberration Measurements on BS9152

Seeing has considerably be improved, guider reports seeing ~ 0.7-0.8", try field aberration measurements

Data are in /OldRepository/AGW_Data/100329_Field

07:50 pointto BS9152, GS=0, TelM=active, let collimate for a while to see if seeing stays constant, yes

08:10 pointto BS9152, GS=0, TelM=acquire, PAMode=no, centering star by David, OK

08:40 Change DX M2 global to X = 2.5, Y = -3.63, Z = 1.77, RX = -360, RY = -120, clear active optics from M2, did a "tip" of "+40" on OPEM2, total collimation for M2 X=2.5, Y=-1.587, Z=1.77, RX=-752.799, RY=-120, RZ=0,

DX M1 total X=-0.871, Y=0.792, Z=-0.198, RX=-10.418, RY=23.118.

09:02 pointto BS9152, GS=0, TelM=active, let collimate (is SLOW), OK, guider reports ~1.3", sigh, seeing has degraded, check focus (i.e. remove tip try to improve focus), apply tip again

09:02 pointto BS9152, GS=0, TelM=active, let collimate (is SLOW), seeing improved, guider reports ~0-8-1.0, seeing is probably OK, but RMS@WFS is constantly between 500 and 900 not really converging => skipped field aberration measurements

Transformation data

09:49 pointto StoneLagw, GS=0, TelM=active, collimate

09:59 cl < tran_StoneL_mix1.cl, guider reports about 0.8-0.9", collimation better than in BS9152 field

PA=0

transtar(35) 100042 cube 39
transtar (31) 100324 cube 40
transtar (21) 100610 cube 41
transtar (19) 100851 cube 42
transtar (15) 101132 cube 43

PA=180

transtar (23) 101443 cube 44
transtar (17) 101714 cube 45 problems with AZCam, not useful, need to restart GCSR

10:20 cl < tran_StoneL_mix1_rev.cl,

PA = 180

transtar (20) 102148 cube 46
transtar (18) 102430 cube 47

PA=45

transtar (35) 102732 cube 48
transtar (31) 103018 cube 49
transtar (13) 103300 cube 50
transtar (24) 103547 cube 51
transtar (30) 103827 cube 52

PA=210

transtar (12) 104139 cube 53
transtar (22) 104426 cube 54
transtar (26) 104708 cube 55
transtar (34) 104951 cube 56

PA=315

transtar (31) 105319 cube 57
transtar (21) 105600 cube 58
transtar (19) 105839 cube 59
transtar (15) 110116 cube 60
transtar (13) 110355 cube 61
transtar (9) 110630 cube 62

PA = 150

transtar (37) 110938 cube 63
transtar (22) 111221 cube 64
transtar (26) 111500 cube 65
transtar (34) 111742 cube 66

seeing was constantly around 1" throughout the script

11:20 cl < tran_StoneL_mix2.cl

PA = 0

transtar (13) 112157 cube 67
transtar (9) 112439 cube 68
transtar (6) 112723 cube 69
transtar (5) 113003 cube 70

PA = 45

transtar (36) 113249 cube 71
transtar (42) 113536 cube 72
transtar (37) 113823 cube 73
transtar (35) 114105 cube 74

PA = 210

transtar (27) 114414 cube 75
transtar (29) 114659 cube 76
transtar (14) 114958 cube 77, GS not found, not useful, use as backgr for data processing
transtar (16) 115239 cube 78, GS not found, not useful, use as backgr for data processing

PA = 150

transtar (27) 115522 cube 79
transtar (29) 115803 cube 80
transtar (14) 120047 cube 81
transtar (16) 120328 cube 82

PA = 180

transtar (27) 120615 cube 83
transtar (29) 120854 cube 84
transtar (14) 121137 cube 85
transtar (16) 121415 cube 86

Seeing again constantly around 1" on guider

12:16 cl < tran_StoneL_mix3.cl

PA = 0

transtar (13) 121814 cube 87
transtar (9) 122054 cube 88
transtar (6) 122333 cube 89
transtar (5) 122612 cube 90

PA = 180

transtar (12) 122924 cube 91
transtar (22) 123211 cube 92
transtar (26) 123449 cube 93
transtar (34) 123729 cube 94

PA = 210

transtar (23) 124025 cube 95, GS not found, not useful, use as backgr for data processing
transtar (17) 124311 cube 96, GS not found, not useful, use as backgr for data processing

12:45 Stopped, too bright in the meantime

Close

12:47 Closed, photometric, T_out = 6.2, T_Mirror = 5.2, Hum = 4%

-- JochenHeidt - 29 Mar 2010
Topic revision: r11 - 30 Mar 2010, JohnHill
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