0:02 Came to find IFO unlocked. AS Air shows 01 mode.
0:37 Lock loss at LOCK_DRMI_1F after trying to adjust PR3 and BS (the requested state not met)
0:41 Not trusting the alignment due to the 01 mode on AS Air I saw earlier, I restarted the initial alignment.
ALS-C_COMM_A_DEMOD_RFMON was less than 5. I adjusted PR3 until the value reached 5.
INPUT_ALIGN gives repeated message "arm not IR locked" and " timer[ 'pause' ] = 3". LSC-TR_X not flashing. No spot on AS Air.
1:35 Got off the phone with Sheila. She suggested SR2 and SR3 alignment might be bad. I realigned them to where they were 10 hours ago (when the IFO was still locked). It didn't solve the problem. Sheila then suggested I realign PR2 and IM4 as well.
At this point the beam is back on AS Air, but LSC-TR_X still not flashing. So I realigned PR3, BS, ETMX, and ITMX back to where they were 10 hours ago. Lost ALS-X in the process.
3:58 Relocked ALS-X. INPUT_ALIGN request state finally met (*phew*). I tweaked PR2 YAW but couldn't get LSC-TR_X to reach 1 (it was ~0.97 -- close enough?).
Adjusted BS during MICH_DARK_LOCK. The requested state was never met. I tweaked BS until ASAIR_B_RF90 went to 0 and moved on to the next state.
5:00 ALS_DIFF told me to find IR by hand. So I tweaked VCO until IR found. If you (fellow operators) ever have to do this, the narrow peak you see in LSC-TR_Y is a lie (in a sense that you can't get LSC-TR_Y to rise and become stable from there). Tweak VCO until you get a broad peak. Then decrease the step size and adjust the VCO until LSC-TR_Y is steady around 1.
5:20 Lock loss at BOUNCE_VIOLIN_MODE_DAMPING. No obvious reason. Rt. 10 traffic is picking up though. Lockloss analysis attached.
5:50 IFO at DC_READOUT -- waited until the IFO settle before requesting LSC_FF
5:55 Locking at LSC_FF (nominal). Range ~50 Mpc. Intent bit switched to undisturbed.
6:06 Sheila suggested earlier that I turn the ring heater power down to 0.4 W after the ifo is locked (from 0.5 W). So I change the RH power to 0.4 W. The intent bit is still undisturbed at this point.
8:00 Still locking and going strong. Handling off the ifo to Patrick (Covering for Cheryl).
If lock loss again during the day, I suggest whoever has the interferometer at that point redo the initial alignment. Maybe realign the optics I haven't touched or mentioned in this alog. AS Air spot is off to the right and the range isn't that great (I've seen the ifo stable at a better range, though Vern is happy with where it is). The drift monitor shows that OMC pitch and yaw is "Somewhat out of range" and in "Danger Zone".
With 23W operations, there is a step Operators had been setting for the EX ESD Driver (post Stefan/Evan's high power work last Fri). I can't remember how to get to the this medm without it in front of me, but basically there is a small-ish medm window with an ESD ACTIVE box (RED or GREEN) on the lower right, and above it is a HI & LO button and a skinny red or green box in between these boxes (it's green when you are LOW & red when you are in HIGH state). To the right of this, are monitors.
At the end of my lock yesterday, ESD ACTIVE was red, the monitors were several hundred counts in the negative (TJ showed me that they should be around zero). So, I clicked the HI button, and this briefly took ESD ACTIVE to green, and then to red. More importantly, this took the monitors to around zero (also showed a huge glitch on DARM on projector0), and the range climbed from 56Mpc up to 66Mpc.
Are we happy with 23W operation? Is deactivating EX ESD Driver something we want to make part of standard operating procedure? Do we want Guardian to take care of this for us?