8:33 - 9:50(JST)
Before that DARM OLG measurement
After that vibration injection test POP table
After the regular initial alignment, we tried to lock the PRFPMI RF lock.
From my experience, the IRX and IRY transmittance power became ~100 and ~70 for the first lock after the initial alignment.
Then we waited the PRFPMI RF lock with arm ADS.
If we wait for a long time, the IRX and IRY became ~120 and ~115, then guardian moved next step, but in this case, the lock duration of observation was about 6 min yesterday.
So I reset all ADSs, and lock the PRFPMI RF again.
This time, I stopped the arm ADS when the IRX and IRY became ~130 and ~100, respectively.
In this situation, lock duration became more than 2 hours and (Need the investigation) sensitivity around 100 Hz seems better (from my eye, so I measured the DARM OLG).
Is this due to the tidal or other issue?
In fact this channel is always drifting away in one direction during each OMC lock as far as I know. OMC has a bunch of mysteries and this is one of them...
Fig.1. Around two weeks in O3GK
Fig.2. One of famous lock around 12th Apr.
I see, thank you for digging the data. I haven't seen this trend would reverse the way...