Today’s plan was to perform the test proposed by Michal in the entry 68494 to investigate the effect of the DAS horizontal motion on both the B1p and B1s cameras.
ITF locked in LN2 at 13.25 UTC.

STEP 6:  at  13.36 UTC we moved WI DAS by 0.5 cm (2778 steps) in the forward direction. 
In order to reduce signal fluctuations due to the bad weather, at 14:28 UTC Manuel put the BS control into full bandwidth.

STEP 7:  at 14:54 UTC, the WI DAS was moved by an additional 0.5 cm (2778 steps) in the forward direction.
ITF unlocked at 15.19 UTC.

Since the ITF was unable to relock, at 16:40 UTC, with the ITF down, I reverted steps 6 and 7 to recover the pre-shift configuration (STEP 4 described in the entry 68479).
All the steps performed during the January 14 shift (68479) and today are shown in Fig. 1. The main ITF signals during the shift are shown in figure 2.
Figure 3 shows the B1p and B1s images at the steady state of each step, compared with the reference images acquired before starting the movements.
In both the “Nominal Position before installing the SR diaphragm” and step 7, the bright spot appears on the same side of the B1s camera, i.e. the right side (Fig. 4).