1005-1205 and 1400-1545 hrs local -> Kyle back and forth between CS and BT port X2-8 

Ran diesel generator at BT port X2-8 between 1030-1540 hrs local

The ALS Comm and Diff "shuttered" states are now GoTo states, since we've had two or more locklosses today when shuttering ALS.  This is somewhat similar to what we saw back in August (aLog 20286) where if the ALS can't get to the shuttered state, it goes to lockloss, going through the ALS Down state, which clears things like the DARM gain.  This isn't good, since at this point we're not using ALS for DARM anymore, so it doesn't matter if the green laser loses lock.  Today, the green Xarm was losing lock before we asked for the shuttered state, which was causing the guardian to take ALS_DIFF through its down state.  Anyhow, "shuttered" is now a GoTo state so that even if the greens lose lock, we don't lose the whole IFO needlessly.

I restarted it. Screenshot of error attached.

Keita, Evan

We installed a mixer-based 45 MHz RFAM monitor using two spare 45 MHz spigots on the distribution amplifier on the ISC rack. This provides an unobtrusive way to look for 45 MHz amplitude glitches on the ISC rack (i.e., it does not require inserting anything into the main 45 MHz drive that goes to the EOM driver and the EOM). On the other hand, if the glitches are only on the main 45 MHz drive, this monitor will not tell us anything.

Set-up is as follows:

• Spigot #7 is attenuated by 5 dB and goes to mixer LO. Spigot #8 is attenuated by 12 dB and goes to mixer RF. The spigots are nominally 13 dBm, so the mixer (ZAD-1, level 7) should get 8 dBm in its LO port and 1 dBm in its RF port.
• IF of mixer is sent through an 11 MHz minicircuits LPF, and then is terminated with 50 Ω. The dc component of this output is 175 mV.
• The output is then sent into an ac-coupled SR560 with a gain of 1000. This produces a signal whose voltage ASD is 18 µV/Hz^1/2 at 100 Hz, as measured with an SR785. If the SR560 is terminated at the input with 50 Ω, the voltage ASD is 5 µV/Hz^1/2 at 100 Hz.
• The output of the SR560 is sent into LSC-EXTRA_AI_1. This should add an additional 4 µV/Hz^1/2 of noise.

I have calibrated LSC-EXTRA_AI_1_OUT so that it is in volts. This channel is not dequeued, but if we have another hours-long episode of glitching we can watch the test points in real time.

Evan and Keita are disconnecting the RF AM monitor in the PSL enclosure.
Running a2l.

The ISC_LOCK guardian was stuck at DC Readout Transition because the OMC wasn't ready, although the guardian log only said "not ready", and there was no notification that popped up.  Patrick re-requested the OMC guardian to go to Ready For Handoff (which worked), but I also added a notify to the ISC_LOCK guardian to say "OMC not ready" if this happens again.

Lost lock trying to engage ISS second loop by hand.

SUS SR2 saturating 17:48:35 UTC

Did this yesterday afternoon (11/18) but forgot to log it then.

17:10 UTC Out of observing for Keita to test grounding configurations for RF AM monitor. Not going into PSL enclosure. (WP 5616)

TITLE:   Nov 19 Owl Shift 08:00-16:00UTC (00:00-08:00 PST), all times posted in UTC

STATE Of H1: Observing at 80 Mpc

SUPPORT: David, Laura, TJ, Andy, Dan (sorry if I missed any of you!)

LOCK DURATION: 7 hrs 53 mins

INCOMING OPERATOR: Patrick

END-OF-SHIFT SUMMARY: We have nasty stationary lines between ~100-1000Hz since we started locking 12 hours ago. Few Detcharians gathered this morning to follow this up. Keita arrived and shed the light to this mystery that it is in fact the newly installed RF monitor injecting noise into DARM (alog 23555).

ACTIVITY LOG:

15:16 Bubba driving along the arms to check on tumbleweed

15:29 Bubba back. The landscape crew is taking care of it. They're working from 250m from EX towards Corner station.

TITLE: 11/19 [DAY Shift]: 16:00-24:00 UTC (08:00-16:00 PDT), all times posted in UTC
STATE Of H1: Observing @ ~ 80 MPc.
OUTGOING OPERATOR: Nutsinee
QUICK SUMMARY: From the cameras the lights are off in the LVEA, PSL enclosure, end X, end Y and mid X. I can not tell if they are off at mid Y.
Earthquake seismic band is between ~ 0.01 and 0.03 um/s. Microseism has been coming down and is between 0.1 and 0.4 um/s.
Winds are between ~ 0 and 5 mph.
ITMX, ITMY and BS ISI blends are on 45mHz. EMTX X and ETMY Y ISI blends are on 45mHz. ETMX Y and ETMY X ISI blends are on Quite_90.

I've been noticing all night but not sure where from. Those nasty little lines seem to have come with a broad peak at 1040Hz. It's not the violin mode second harmonics (which ends at ~1010Hz).