I used this jupyter notebook from Gabriele updated with the scan times below and found at: /ligo/home/jennifer.wright/Documents/OMC_ALignment/OMC_Alignment_2024_04_26_2.ipynb
start 1398184622 GPS
end 1398187822 GPS
The new offsets are found relative to the old offsets by tuning the red lines in this plot to match the peak of the 410 - 411 Hz band-limited RMS (BLRMS) of the OMC DCPDs against the changing OMC ASC loop offsets. This works because the 410 Hz calibration line height scales with optical gain on the OMC DCPDs.
If one looks at the GDS-CALIB-STRAIN BLRMS at 800-900 Hz this dependence cannot be seen (the current value is favoured in these plots) and since these BLRMS are related to shot noise this could mean the squeezer is not well-matched to the OMC currently as suggested by Gabriele here.
I used this jupyter notebook from Gabriele updated with the scan times below and found at: /ligo/home/jennifer.wright/Documents/OMC_ALignment/OMC_Alignment_2024_04_26_2.ipynb
start 1398184622 GPS
end 1398187822 GPS
The new offsets are found relative to the old offsets by tuning the red lines in this plot to match the peak of the 410 - 411 Hz band-limited RMS (BLRMS) of the OMC DCPDs against the changing OMC ASC loop offsets. This works because the 410 Hz calibration line height scales with optical gain on the OMC DCPDs.
If one looks at the GDS-CALIB-STRAIN BLRMS at 800-900 Hz this dependence cannot be seen (the current value is favoured in these plots) and since these BLRMS are related to shot noise this could mean the squeezer is not well-matched to the OMC currently as suggested by Gabriele here.