With only a few ETMY Saturations not associated with the RF45, the shift has relatively little to remark on in data quality.  The wind has lumped up a couple times but never more than 10 mph or so.  The useism after trending down for a day has swung back up and again maybe peaked, running at ~.3um/sec.  Barker the restarted the nds1 machine after it died.

the daqd process on h1nds1 stopped running at 14:51 PST, log file details shown below. Looking back I see many of these "NDS failed" messages from the 12/24 21:14 evening restart (following the computer freeze up). I restarted the daqd process and then stopped and started the nds process. If we are having any problems getting archived data, we could try rebooting the machine.

[Sun Dec 27 14:51:07 2015] read(seq_num) from NDS failed; errno=0

[Sun Dec 27 14:51:07 2015] connection closed on fd=186

[Sun Dec 27 14:51:09 2015] read(seq_num) from NDS failed; errno=0

[Sun Dec 27 14:51:09 2015] connection on fd 144 closed

[Sun Dec 27 14:51:09 2015] connection closed on fd=226

[Sun Dec 27 14:51:09 2015] connection on fd 110 closed

Observing for the past 12 hours.  Microseism and wind are both up a bit, but still at manageable levels.  There is a dusting of ~1/2 inch of snow on site.

I won't be able to come in during the afternoon today so I did a fill this morning (~0720 hrs. local) and will back tonight ~2200 hours or so.  


Pressure step (~0100 hrs. local) depicted in attached shows up on Y-arm gauges but no indication that IP9 is responsible.  

Title: 12/27 Owl Shift 08:00-16:00 UTC (00:00-08:00 PST).  All times in UTC.

State of H1: Observing at 80 Mpc for 8 hours.

Shift Summary: Another very quiet shift. Useism is trending up and reaching 90th percentile. Almost 0 wind.

Incoming operator: Travis

Activity:

15:14 Kyle called letting me know that he's driving down to EY to check on something.

15:38 Kyle called that he's back in the corner station

It's been a quiet shift. Omicron looks clean. Useism is trending upward. Wind ~15mph. We have been observing since 4.5 hours ago.

A note on a weird seismic behavior: This is the thrid night that I've noticed a big bumb in seismic activity at 3-10 Hz that doesn't correspond to high traffic time. The attached plots are the 3-10 Hz BLRMS from the summary page from Dec 25-27. On the 25th the peaks seems random starting at 6:00 UTC and ends at 14:00 UTC. But on the 26th and 27th the peaks are at ~10:30 UTC (2:30 in the morning local time!). And only the corner station sensors are seeing it. Unlike the noise from local traffic that usually shows up everywhere in the 1-3 Hz band. I don't really see this behavior prior to Dec 25 (usually the 3-10 Hz ground motion comes with the 1-3Hz motion). We have been having low wind over the past three days (below 10mph on Dec 25-26 and below 20mph on Dec27 until the time of this alog was posted). I can't say for sure that we suffer any range drop from it on Dec26-27 but the time when the seismic bumb appeared and disapeared almost coincided with the time that nasty glitches started and ended on Dec25 (which was not all caused by RF45. See alog24466 and alog24477). The h(t) spectrogram from Dec26-27 shows some excess noise just below 10Hz when the bumb occured. Anyway... I just found this behavior interesting and wanted to point it out.

TITLE:    Dec 26 EVE Shift 00:00-08:00UTC

STATE Of H1: Observing

SUPPORT:GregM

SHIFT SUMMARY: Quiet shift. Lost lock, be re-locking was easy. LSC started drifting for a couple hours before the loss, but nothing else looked bad.

ACTIVITY LOG:

0:30 Dale brough a large tour into the CR. They behaved themselves.

5:00 LSC-POP started a slow trend down, not sure what the cause was. Alignment drift?

6:30 Lockloss, LSC-POP continued its downward drift, then RF90 started going limp, then lockloss. I attach lockloss plots, but I think this started an hour or two before.

6:45 I start an initial alignment because ALS-Y won't lock. I had to touch TMSY some, but only small tweaks.

8:00 Back to observing.

Quiet shift. Microseism continues trending down, winds are moderate at ~10 mph. The current lock has survived 25 hours now.

Since the fourth Friday of the month in December fell on Christmas day, the second LHO Dec. public tour occurred today, 12/26/15.  Arrival time at LSB = 2:30 - 3:15 PM.  Departure time = 5:00 - 5:40 PM.  Group size = ~80 adults & kids.  Vehicles at the LSB = ~30 passenger cars.  The group was on the overpass near 4:15 PM and in the control room from about 4:30 to 5:00.  

Title: 12/26 Day Shift 16:00-24:00 UTC (8:00-16:00 PST).  All times in UTC.

State of H1: Observing

Shift Summary: In Observing for my entire shift and 20.5 hours total now.  No issues this shift.  Very quiet wind and seismic. 

Incoming operator: Jim

Activity log:

21:30 Kyle on site for CP3 maintenance

21:41 Kyle starts his drive to CP3

22:30 Kyle done at MY

22:46 ~12 cars to LSB for afternoon tour

23:05 CW injection running alarm

23:22 CW injection inactive alarm

What a difference 24 hours make.  The wind has remained below 10mph and the useism continues to trend down now at 0.6um/sec on average.  There have been no audibles for saturations and the range trace is very lovely.  Best to all-H

~1405 hrs. local 

Sampled ~ 1.5 quarts of LN2 at the spigot prior to the LLCV to examine appearance -> I did find a few suspended solids but cannot conclude that they originated from the LN2 or if they were liberated from the fitting that had been left open to the air uncapped

Opened LLCV bypass valve 1 turn ccw then partially opened exhaust check valve bypass valve (to reduce back pressure) -> liquid evident at exhaust after 30 seconds -> Let fill for 90 seconds 

I placed a pan at the exhaust to collect liquid -> I did not see anything suspended in the colorless liquid -> I also noted that the local dewar mechanical gauge was indicating 110" which would translate to > 30% if the CDS transducer and mechanical gauge were calibrated to each other -> I cycled the valves to zero the mechanical gauge and, in doing so, changed the transducer output (was indicating 24.2% before cycling valve and 25.4% afterwards) 

I am surprised that, prior to the "plugging" earlier this week, the LLCV was, on average, open 19% to maintain a pump level of 92% but since has been manually kept at 15% open and yet the pump overfills after only a minute or so via the LLCV bypass circuit.  

We have been cruising along at ~80 MPc for 18.5 hours currently.  Wind and seismic are very calm.  No issues to report.

O1 day 99

model restarts logged for Fri 25/Dec/2015 No restarts reported

Title: 12/26 Owl Shift 08:00-16:00 UTC (00:00-08:00 PST).  All times in UTC.

State of H1: Observing at 80 Mpc for 12.5 hours.

Shift Summary: Very quiet shift. Got a high alarm for FMC-CS_LVEA_REHEAT_1B. Temperature reached 39 degC, 102 F.

Incoming operator: Travis

Things have been quiet. Useism is trending downward. Hardly any ETMY saturation tonight. Very stable BNS range. Wind below 5mph. LLO has been down because of wind.

Title: 12/25 EVE Shift 00:00-08:00 UTC

State of H1: NLN

Shift Summary: Started out rough, but after a couple rounds of IA roulette, the IFO locked, quiet times since.

Activity log:

00:30 Kyle off site

3:30 Locked, Observing

~06:00 I notice EX ISI starting to ring up

07:30 EX gets worse, I drop the IFO out of observe, change blends, back to NLN

Uneventful shift once in observing mode.

No wind to speak off, all antropogenic are quiet. Inspiral range pegged at 80Mpc.

About 2 hours ago the EX ISI started ringing up again. As the situation was getting worse over the last few minutes, I decided it was time to switch blends. Attached plot shows the StripTool I was watching with the EX CPS locations and IMC-F (the gray trace). I switched the Y DOF blend first (green), it changed smoothly, but didn't reduce the motion. Then I changed the X blend (blue), which settled things down pretty much immediately. I thought it was interesting that IMC-F seemed to lead the swings of the ISI, ie IMC-F seemed to change direction a little before the ISI did. Don't know what that means, but interesting.

I add for the operators: If an ISI is ringing up, and you change the beam direction blend to the 90 blends (X for EX, Y for EY), you should change the perpendicular blend as well. ASC probably doesn't care, ALS doesn't, but 20 micron motion of the tables is bad just on principle.