- B1p: the reference beam and the probe beam (B1p) were already well superposed; I reduced the neutral density of the reference beam to increase the power reaching the photodiode and the SNR; I improved a bit the centering on the photodiode.
- B4: the reference beam and the probe beam (B4) were already well superposed; the probe beam was clipped by one of the diaphragms used to avoid back-reflections entering on SPRB and I recentered it; I improved the centering on the photodiode.
Figure 1 shows the acquired images.
On October 8th, starting from 9:41:05 UTC we took some minutes of data in the LOCKED_MICH_HF state to have reference images for the phase camera data analysis. In order to remove some interference fringes on B1p caused by some ghost beams, we had to misalign PR_TY by -60 urad (figure 2).
Following Michal's request we set the ITF in SINGLE_BOUNCE_NI to have some reference data for detector characterization monitoring:
- from 10:16 UTC to 10:19 UTC ITF in single bounce. Some interference fringes on B1p caused by some ghost beams are visible (figure 3);
- from 10:20 UTC to 10:22 UTC ITF in single bounce with PR_TY misaligned by -60 urad. The beams acquired by the phase camera are a bit cleaner (figure 4).
