Unfortunate turn of events considering the trouble I'm having.

Bubba turned on heater 3A yesterday to help deal with the cold conditions. You can see in the plot that the heater is cycling, probably on a protective temperature switch.

Nutsinee reported some misbehavior in the LVEA 10-30 Hz seismic activity.

I'm not sure there is any correlation between these two events but someone might look at this. The heater is likely ~25kw so there is some significant EMI from the contactor opening and closing. 

Re-locking has been a daunting task to say the least. PRC gave me a really hard time trying to get it locked. Upon getting it locked and the control signals converged, DRMI alignment still looked pretty terrible. BS alignment was checked repeatedly but to no avail to the alignment. I then decided to do a complete initial alignment. The IMC became unstable while trying to re-align the arms and I had to clear he WFS and re-align the optics. After letting the loops have the alignment for tuning during a brief break I continued with the initial alignment. Locking attempts following have been more sucesssful but not completely successful. So far, the farthest I've gotten is DC Readout.

4.8M Indonesia

Was it reported by Terramon, USGS, SEISMON? Yes, Yes, No

Magnitude (according to Terramon, USGS, SEISMON): 4.8, 4.8, NA

Location: 56km ENE of Taniwel, Indonesia

Starting time of event (ie. when BLRMS started to increase on DMT on the wall): ~06:30 UTC

Lock status? Caused lockloss.

EQ reported by Terramon BEFORE it actually arrived? Yes

Note: There were multuple earthquakes happened around the same time. It's not neccessary that this one in particular caused the lockloss. But the timing reported by Terramon matches.

TITLE: 01/14 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC

STATE of H1: Earthquake

INCOMING OPERATOR: Ed

SHIFT SUMMARY: The range was awfully low but the IFO stayed locked until an earthquake knocked us out. Otherwise nothing exciting.

LOG:

07:19 Lockloss. There were several earthquakes happened right around the same time but the arrival time of the 4.8M Indonesia earthquake is closest to the peak time observed in the control room. The peak reached 0.4 um/s on the 0.03-0.1Hz FOM.

About 2 hours into this lock stretch the range started to drop very fast. About the same time 10-30 Hz seismic activity (LVEA vertex) is behaving funny. I don't believe that it's real (no one is out there). I don't see funny things in magnetometers. Still looking for more clues. Electronics related?

It's been set to KILL since Jan 4th. Are we leaving it at KILL on purpose?

Patrick handed me a locked interferometer. The range still low. DMT Omega shows low frequency up to 20Hz is more glitchy compared to the past 12 hours. at 3:17 UTC (about 50 minutes into the lock) I watned to hit the button to run a2l dtt but instead I hit run a2l button. Back to Observe 3:34 UTC.

02:35 UTC Set to observing. I had to accept an SDF difference (see attached). I'm not sure what caused it. Would someone mind taking a look?

The OMC length locking ugf was increased at 18:30 today (while the interferometer was unlocked).  It will stay this way permanently now, and we will have fewer glitches. (see alog 33104 for the work detch has done checking out that this configuration change is OK)

We intend to do this during the days when we are here as an experiment.  If the clog is due to ice, reverse sublimation would be a convenient fix but we haven't looked at this closely.

TITLE: 01/14 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 54.8268Mpc
INCOMING OPERATOR: Nutsinee
SHIFT SUMMARY: Ran initial alignment after losing lock. Stopped at DC readout transition while Jim damped 4735.09 Hz violin mode. Sheila increased the ISS diffracted power and I accepted the SDF differences (see attached). Sheila and Jenne took time at NLN to investigate the loss in range.
LOG:

16:42 UTC Chris to end Y to remove snow with John Deere tractor
16:49 UTC Bubba to end X to remove snow with front end loader
16:52 UTC Turned off sensor correction at end X
17:23 UTC Jim and Carlos to end X to check power supply for network switch
17:34 UTC Jim turning off another degree of sensor correction at end X, dropped to commissioning
17:36 UTC Jim accepted SDF difference, set back to observing
17:40 UTC Krishna changed filter that kicked us out of observing, set back
17:41 UTC Set back to observing
18:00 UTC Jim and Carlos back
18:11 UTC Lockloss. HAM6 ISI trip. Spike to ~ .1 um/s in end Y 0.03 - 0.1 Hz seismic band
18:15 UTC Jason to LVEA to increase SR3 laser power
18:19 UTC Karen driving to warehouse
18:24 UTC Starting initial alignment. ALS X is ~ .7
18:26 UTC Jason done
18:59 UTC Kyle to mid Y to turn on diaphragm pump for CP4 sensing line
19:08 UTC Turned off sensor correction at end Y
19:09 UTC Jim and Carlos to end Y
19:18 UTC Gerardo to mid Y
19:29 UTC Chris back from end Y
19:35 UTC Kyle back
19:40 UTC Jim and Carlos back
19:43 UTC Initial alignment done. Had some trouble locked SRC.
19:48 UTC Bubba done snow removal
19:49 UTC Sensor correction turned back on at both end X and end Y
20:01 UTC Stopped at CHECK_IR. Sheila adjusted ISS diffracted power from 1 to 4 percent following procedure in alog 31262
20:10 UTC Gerardo back
20:27 UTC Stopping at DC_READOUT_TRANSITION per Sheila's request. Jim damping 4735.09 Hz violin mode using procedure in alog 32081. Set H1SUS-ETMY_L2_DAMP_MODE10 gain to .1
20:52 UTC NLN. Set 4735.09 Hz damping gain back to .1, guardian must have reset it?
20:57 UTC Sheila starting investigation in low range
20:59 UTC Accepted SDF differences for ISS diffraction change
21:05 UTC Setting observation mode to corrective maintenance for Sheila's investigation
21:57 UTC Batteries in UPS for portable atomic clock died
22:30 UTC Filiberto and interns to mid Y to look for equipment
23:36 UTC Damped PI mode 28
23:41 UTC Gerardo to mid Y to retrieve power supply
23:43 UTC Filiberto back
23:50 UTC Sheila and Jenne done investigation. Set to observing.
00:28 UTC Lock loss after steadily falling range.

J. Kissel, S. Dwyer, E. Goetz, K. Venkateswara

We're lamenting last night's severe decay in range, and the gross long term trend toward zero since the restart after the break. Our most said theory (which doesn't make it the best or the right theory) is temperature adversely affecting the global alignment system's operating point, which has steered the IFO into a place with much worse scattering coupling. As such the anthropogenic noise (3-10, 10-30 Hz BLRMS of ground motion) is now adversely affecting the IFO much more than in the past. 

We'd like DetChar's help to confirm:
- We've lost our fellow whom has run BruCo for us. Does detchar in general know how to run BruCo, or does Gabriele need to teach new people again? We suggest that no coherence with any particular channel would confirm the non-linear process of scattering.
- We see summary page spectrograms showing excess noise, but they're too long of a time scale to tell if the features are scattering arches.

Note that Bubba had started plowing at the X-End this morning, so data from ~17:00 UTC will show elevated 3-10 and 10-30 Hz BLRMS seismic noise there. So we understand that ground motion is much higher then, and because of the greater sensitivity to it (again, claiming the alignment operating point increases scattered light coupling theory) -- the problem is overnight when there appears to be no elevation in seismic noise, but the range is still terrible.

Any other ideas are welcome.

--------
Also because Bubba was going down to the X-end, we turned off sensor correction at 16:52 UTC (LHO aLOG 33221). This looks to coincide with the 1080 Hz glitching getting worse on the summary pages. This is consistent with the OMC length noise increase investigations we've done over the past few days (LHO aLOG 33104 and LHO aLOG 33037).