After being locked for ~1.5 hours, ASC yaw oscillations started to build up. I re-phased PIT3 in the ADS overview to 110 via Georgia's original re-phasing alog (49298). This is reducing the oscillations, so I am accepting sdf changes for this phase setting.
Additionally, before this we were getting taken out of Observing sporadically with changes to H1:SQZ-FIBR_SERVO_COMGAIN, H1:SQZ-FIBR_SERVO_FASTGAIN, and H1:SQZ-FIBR_LOCK_TEMPERATURECONTROLS_ON. On the SQZ medm screen it looks like the SHG Power is to blame, as it is railing to -9000. There is an alog about this that Nutsinee posted (48760), but I don't think I can recreate what she did to mitigate the problem. We still get an extra 15 Mpc with squeezing on, so I'm un-monitoring these channels for now and going back to Observing.
This doesn't look like it is caused by the power stabilization servo (even so it is railed). This is related to the TTFSS. More likely a laser related readback is close to its limit and trips the laser auto-locker. Look at the error flags of the squeezer laser auto-locker to determine which sensor might be responsible.
Was alog 49181 ever un done?
Looking at the Laser Auto Locker medm, I see the autolocker is OFF, and we have the following error:
"Fiber trans PD Error" (screenshot attached).
In an alog search, I see that there were waveplate adjustments on Maintenance by Sheila (alog 49237).
Ops Note: Will we want to re-monitor the squeezer channels Niko notes above at some point?
OK, after chatting with commissioners and emails from Daniel, wanted to give an update.
Issue appears to have fixed itself after the RefCav touch up by Jason. So undid what has been done for this last night & alog 49181 on Daniel's request:
- High Power Limit returned to 0.03 (Sheila already did this. see attached)
- Re-enabled HiLo (see attached)
- Monitored 3-channels Niko unmonitored on CS_ECAT_PLC4: H1:SQZ-FIBR_SERVO_COMGAIN, H1:SQZ-FIBR_SERVO_FASTGAIN, and H1:SQZ-FIBR_LOCK_TEMPERATURECONTROLS_ON.
