IFO could not be recovered after the long lock loss caused by several big earthquakes.
After GR lock, PRMI_3F_LOCkED state could not be realized for a long time. No resonance in both arms were found.
Sometimes, "waiting for BS calm down" was shown.
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Fig. 1 shows the ETMX/ITMX oplev changes before and after the isolated state is triggered by large earthquakes.
ITMX HOR seemed to be different by 2 urad. ETMX HOR seemed to drift significantly before the lock loss.
Fig. 2 shows the ETMY/ITMY oplev changes before and after the isolated state is triggered by large earthquakes.
Almost the same values were kept before and after.
Fig3 shows the BS, PR2/3, and SR2/3 OPLEV values.
Almost all values were recovered as before the lock loss.
I requested DOWN in the LSC_LOCK guardian around 5:00 JST maybe because the PRMI alignment seemed to be destroyed.
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