After in-chamber crews physically moved the BS, I was able to restore both the IMC flashes and the sqz beam reflected by ITMX as well as ITMY in AS as well as ISCT1 REFL camera by just using the BS sliders. sqzbeam_as_isct1.png and the video PXL_20260625_204834048TS.mp4
show the sqz beam in the AS (left) and ISCT1 (right) camera when IMC was misaligned, while PXL_20260625_204905669TS~2.mp4 is the video of the IMC flashes when SQZ beam diverter was closed.
BS top suspension offsets were H1:SUS-BS_M1_OPTICALIGN_P_OFFSET = 107.00 and H1:SUS-BS_M1_OPTICALIGN_Y_OFFSET = 441.00.
Right now F2 coil is using ~10% of the DAC range (~13.3 million counts out of 135 million), F2 ~ 6%, and others are small. See BS_DAC_range.png. I don't think further trying to relieve this will be fruitful or useful.
The BS alignment looks as good as we can get with available resources at this point. Even though we know that the BS alignment nor the input alignment from PR3 to BS is perfect and that SQZ beam and the IFO beam are not co-aligned with each other, those things should be dealt with after pumping down.
