stefan.ballmer@LIGO.ORG - posted 21:27, Friday 08 March 2024 - last comment - 09:55, Monday 11 March 2024(76223)
Simple OMC dither alignment working - very little headroom on OMC SUS T2 T3
Since we have a new OMC, we need to find the best optical gain spot on the new OMC.
To that end I closed the OMC ASC dither loops iwth a simple diagonal matrix (OM3-->OM3 and OM1-->OMC_SUS). It did converge with very low gain, but to a spot with not much headroom on the OMC_SUS (we are at 115000ct out of 131000cts on T2 and T3).
In that setting I reset the H1:ASC-OMC_[A/B]_[PIT/YAW]_OFFSET offsets, so right now we can lock to that spot with either dither or QPD.
Next: hunt for best optical gain around this spot.
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Just as with the last OMC the optimal spot optical gain seems to be slightly different from the dither target. Did some manual optimisation to reach the attached QPD offsets.
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Updated the dither input matrix H1:OMC-ASC_DACTMAT in SDF.
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