UT 24 May 2021

PEPSI-Pol AGW Checkout

* Rollover of critical task from previous night - taking a bit of time at the start of the science night for AGW4 alignment check

02:46 UT ACTIVE preset on-axis to Persson star mag 10.7

Check AGW4 Guiding Hotspot

Initial AGW4 Guiding Hotspot was 264,247

(max from hotspot params were already in place)

Starting with Zernike sending blocked. Signs of motion listed in BGTechProcedures were correct.

Eyeball adjustment to AGW4 guiding hotspot 260,245 (possibly still off by +-1 pixel)

Unblock Zernikes to allow initial active optics corrections

Measure New AGW4 On-axis pupil position

Before this run, John Morris had adjusted AGW4 alignment to get the on-axis pupil in a better position.

Old On-axis Pupil Position 148.79,235.22

Eyeball On-axis Pupil Position 147,205 (preliminary)

On-axis pupils with decent collimation were /Repository/20210524/GCS/right_wfscimage000???.fits 051-056

Processing data as lbto@obs2 in /home/lbto/data/20210524_PEPSIPOL/

/lbt/lbto/supportscripts/ObserverSupport/agw_wfsc_process.py -n -f RPOL -p /Repository/20210524/GCS/ -t right_wfscimage000050.fits -l 20210524.dx.pupil.log
/lbt/lbto/supportscripts/ObserverSupport/agw_wfsc_process.py -n -f RPOL -p /Repository/20210524/GCS/ -t right_wfscimage000051.fits -l 20210524.dx.pupil.log
/lbt/lbto/supportscripts/ObserverSupport/agw_wfsc_process.py -n -f RPOL -p /Repository/20210524/GCS/ -t right_wfscimage000052.fits -l 20210524.dx.pupil.log
/lbt/lbto/supportscripts/ObserverSupport/agw_wfsc_process.py -n -f RPOL -p /Repository/20210524/GCS/ -t right_wfscimage000053.fits -l 20210524.dx.pupil.log
/lbt/lbto/supportscripts/ObserverSupport/agw_wfsc_process.py -n -f RPOL -p /Repository/20210524/GCS/ -t right_wfscimage000054.fits -l 20210524.dx.pupil.log
/lbt/lbto/supportscripts/ObserverSupport/agw_wfsc_process.py -n -f RPOL -p /Repository/20210524/GCS/ -t right_wfscimage000055.fits -l 20210524.dx.pupil.log
/lbt/lbto/supportscripts/ObserverSupport/agw_wfsc_process.py -n -f RPOL -p /Repository/20210524/GCS/ -t right_wfscimage000056.fits -l 20210524.dx.pupil.log

0.05 0.0 0.05 147.04 207.17 145.55 206.63 145.56 206.63 219.19 right_wfscimage000050.fits /Repository/20210524/GCS/ RPOL 0.74 77.0 116 68
0.05 0.0 0.05 147.11 205.79 145.55 206.63 145.56 206.63 219.46 right_wfscimage000051.fits /Repository/20210524/GCS/ RPOL 0.82 77.0 115 68
0.05 0.0 0.05 144.57 206.38 145.55 206.63 145.56 206.63 219.73 right_wfscimage000052.fits /Repository/20210524/GCS/ RPOL 0.78 77.0 115 68
0.05 0.0 0.05 144.38 207.8 145.55 206.63 145.56 206.63 220.01 right_wfscimage000053.fits /Repository/20210524/GCS/ RPOL 0.78 77.0 115 68
0.05 0.0 0.05 147.28 206.72 145.55 206.63 145.56 206.63 220.28 right_wfscimage000054.fits /Repository/20210524/GCS/ RPOL 0.79 77.0 115 68
0.05 0.0 0.05 144.06 208.3 145.55 206.63 145.56 206.63 220.56 right_wfscimage000055.fits /Repository/20210524/GCS/ RPOL 0.8 77.0 115 68
0.05 0.0 0.05 145.96 204.79 145.55 206.63 145.56 206.63 220.9 right_wfscimage000056.fits /Repository/20210524/GCS/ RPOL 0.8 77.0 115 68

AGW4 On-Axis Pupil Position Measured by IDL 145.55,206.63 (manual averaging of above)

New params were installed in agw/agw_define.pro and GCS/PEPSIPOL_R.cfg

Is the on-axis pupil motion in the correct direction?

From IT 7545: "Thus, we confirm that the new fit parameters help. Of course, they will be superceded when we do a new AGW4 alignment which wants to shift the observed pupil 13-16 pixels more positive in the CCD X coord."

This is JohnH analysis in the middle of the night (always suspect).

On-axis Pupil is essentially unchanged in X, and moved ~20 pixels lower in Y. That seems to be moved in the wrong axis.

Why do the on-axis images on the pinhole camera appear elliptical?

Off-axis guide stars look round with avg ellipticity ~0.04 (typical of seeing fluctuations)

Could wrong sign of GCS field correction make astigmatism?

For this first target, field correction is Z5=58 Z6=11 Z7=60 Z8=73

See wfs images 080-190 (rough range)

Second target starting at 05:05 UT has farther off-axis guide star, and has wfs pupil still vignetted on the left edge. For this target, field correction is Z5=-163 Z6=-230 Z7=-196 Z8=+63 SFP=-109,135 mm probe=109.6,477.4

Why does SX active optics run away?

DX active optics is running away because of the vignetting from the edge of the lenslet. But why is SX active optics also diverging sometimes? SX has no obvious vignetting problems.

-- JohnHill - 24 May 2021
Topic revision: r1 - 24 May 2021, JohnHill
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