In the following, the link to NI and WI thermal cameras videos of yesterday's lock acquisition starting around 14:39 UTC, CARM NULL (of around 40 seconds) and a brief time after, together with main ITF signals.
https://owncloud.ego-gw.it/s/NDrWctmKC5ebyb4
As already observed (69742), there is no clear evidence of PAs.
Figure 1 and 2 shows two screenshots from the video of WI. One towards the end of the CARM NULL lock and well before. Jumping back and forth between the two pictures there is a faint absorber visible in the middle of the image. And that point disappears shortly after the unlock.
Figure 3 shows that faint point circled.
Figure 4 and 5 shows the same type of analysis for the NI video. There I cannot notice any points, but it might be harder to notice on the color videos than on the black and white one.
We could not recover CARM_NULL_1F after the TCS steps: the lock parameters need a more careful tuning after these changes.
Presently, the lock breaks at step 2/3 of the CARM offset reduction.
We also undid the change in the /virgoDev/Automation/PyALP/PyUGF/algo.py, resetting the UGF servos step to ±\pm5%
