Before starting this work, LSC_LOCK state was PRFPMI_RF_LOCK.
Set LSC_LOKC = DOWN
Checked the OMC alignment by IRY, tried to check the OMC refl QPDs, slightly off from center, but I could not move the pico motor.
After recovered the PRFPMI_RF_LOCK,
Set LSC_LOCK = LOCKING_OMC_FOR_PRFPMI
And try and error of beacon alignment.
After that, I turned off the beacon control.
Then,
Set LSC_LOCK = OBSERVATION
It was succeeded, but noise level at high frequency was high and OLG was different (Fig.1.)
1st silent run 6:40 - 7:13 (JST)
It was sometimes detected that unknown glitch was detected in around 6:45(JST) here
OMC refl QPD signal during this run can be seen in Fig.3.
After several time lassed (around 7:00(?)) about 1.6 Hz oscillation detected as shown in Fig.4. then locked loss.
2nd silent run
7:50 - 8:50
DARM OLG became healthy(Fig.5.).
Beacon control manually off
The typical sensitivity curve can be seen in here
