FPMI lock was recovered after the re-alignment both X-arm and Y-arm.
Just after lock, sensitivity is not so bad (magenta) and Inspiral range reaches ~5kpc.
But at least 20-30min later, sensitivity is getting worse (blue).
I tested to keep FPMI_LSC_LOCKED but situation was not different. So original cause is not ADS/ASC.
I'll continue the alignment work.
FPMI lock was probably recovered and BNS ranges was also come back around 7-8kpc.
We are now checking the stability.
Finally, we restored the good QPD values of GR_X and good QPD values of ITMY_OPLEV as day before yesterday's values.
After then SALLIGNMENT worked well.
I show the relationship between Lock-duration and QPD, for 12/17 and 12/18
12/17
12/18
more plots here
