Technical Observing AGW1 Field Aberration Data for AdSec 20131218 UT

Observers: JHill, DMiller (Tucson)
Telescope Operator: DHuerta (LBTO)
AO Support: DMiller (Tucson)
Software Support: MDeLaPena (Tucson)

Summary

A brief interlude (1:45 hours) of LFBG field aberration data in the midst of LUCI2 Commissioning. We collected beautiful field aberration data in seeing of 1/3 arcsec on guider, and have completed the binodal adjustment for SX.

After handing the telescope back to LUCI2 work, Doug and Michelle took some Dice5 offset data to check the performance of the new transform. The AGW2 transformation work is also complete.

Details

Field Aberration Data for LFBG

05:07 We get the telescope from the LUCI people (Jochen and Michelle).

Authorize LUCI on the left only. David restarts oacserver to make things happy.

Initial default for LFBG is IE=-72 CA=-75

SX Global X=-3.21 Y=+0.102 Z=0 RX=-42 RY=-569.2

05:22 ACQUIRE preset to a bright star

05:24 Adjust Coma-free Pointing with Tip-Tilt of M2 TIP=+26 TILT=+33

SX Manual X=-1.685 Y=-1.328 Z=0 RX=+255.3 RY=-324.1

05:27 Adjust Pointing-free Coma with Z7/Z8 to M2 hexapod -1000 Z8 and -1200 Z7

05:38 ACTIVE preset on-axis to BS9107 at EL=81 - Seeing is averaging 0.4 arcsec on guider

Data are in /home/lbto/data/20131218_lfbg/

source ~/binoc_setup

idl

iif_register,/TCS

05:42 field_collect, limit=250 (using list BS9107_new)

05:56 Is there a problem with Doug's collimation threshold? It works most times, but not this instance. Is 722 the correct number?

     IRCL: preset, BS9107, MODE=ACTIVE, GS=0, PA=-43.1942     (iif_preset)
   => left preset complete
           722 nm rms error in image left_wfscimage000017.fits
   => Collimated in 1 iteration
  
      IRCL: preset, BS9107, MODE=ACTIVE, GS=36, PA=177.682     (iif_preset)
   => left preset complete
      Collecting 3 wfsc images
   => 3 wfsc images collected
  
      IRCL: preset, BS9107, MODE=ACTIVE, GS=0, PA=177.682     (iif_preset)
   => left preset complete
           463 nm rms error in image left_wfscimage000021.fits
           126 nm rms error in image left_wfscimage000022.fits
   => Collimated in 2 iteration

06:08 SX ACTIVE X=+1.206 Y=+1.287 Z=-0.158 RX=-134 RY=-335

06:10 0.479 arcsec on the mean of the SX AGW1 wfs spots. Bouncing 0.33 to 0.40 arcsec on guider.

06:28 ^C out of field_collect

 => Field Data Results
      Motion of the secondary needed to remove bi-nodal astigmatism
  
                  lfbg
              From residual Focus Measurement
                  On-Sky Arcseconds
         -------------------------------------------
          Tip = -24.5", Delta IE =  24.5"
         Tilt = -23.3", Delta CA =  23.3"
  
   
 => Field Data Results
             Measured bi-nodal astigmatism
  
                  lfbg
              From 45 Astigmatism Measurement
                  On-Sky Arcseconds
         -------------------------------------------
          Tip = -22.8", Delta IE =  22.8"
         Tilt = -37.8", Delta CA =  37.8"
  
  
                  lfbg
              From 0 Astigmatism Measurement
                  On-Sky Arcseconds
         -------------------------------------------
          Tip = -22.5", Delta IE =  22.5"
         Tilt = -31.1", Delta CA =  31.1"
  

06:34 Apply dTip=-20 dIE=+20 dTilt=-33 dCA=+33
Net SX Tip-Tilt is now Tip=6 Tilt=0
SX IE=-52 CA=-42 installed in SX_Gregorian.20131218.ptmod

SX Manual X=0.000 Y=-0.306 Z=0.0 RX=58.9 RY=0.0
SX Active X=1.110 Y=+1.290 Z=-0.134 RX=-134.44 RY=+115.66
SX Global X=-3.21 Y=+0.102 Z=0 RX=-42 RY=-569.2

SX NewGlobal X=-2.100 Y=+1.086 Z=-0.134 RX=-117.5 RY=-453.6 which was installed in all the SX Gregorian focal stations.

06:36 field_collect again to get check data on the above

06:52 Telescope returned to LUCI2

Transformation Check for AGW2

07:00 Doug installed new AGW#2 transformation in oacontrol.conf (and .conf.default). This was determined from data taken on 20131217. Transformation looks good!

Transformation:
ax1 + by1 + kx = x2
 -1.0021987958103762 0.032239780592962175 0.6724753058734858
ax1 + by1 + ky = y2
 -0.032239780592962175 -1.0021987958103762 611.7979640497126
RMS(X)=  0.03532  RMS(Y)=  0.03639

07:05 David stops and start oacserver and AGW's and GCS

07:15 Michelle collect several Dice5 to confirm that the transform performs as advertised. As seen on the first guider image, the offsets seem to be missing by about 0.3 arcsec (only noticeable because the seeing is so good and stable.).

The DX wfs FWHM is 0.472 when the guider FWHM is 0.30.

07:17 FWHM on DX Guider is 0.24 arcsec. But, ellipticity is running about 0.15. Is this caused by undersampling, or is there a slight tail on the image? Doug's lenslet boxes look like they are about 10% low on the IDL display.

-- JohnHill - 18 Dec 2013
Topic revision: r5 - 18 Dec 2013, JohnHill
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