There are continuing high dust counts in both the LVEA (mostly in the Bier Garten) and well as both rooms in the PSL. I have increased the alarm levels on PSL-101, PSL-102, LVEA-6, and LVEA-10 by 10x to lower operator alarm fatigue, while I try to figure out the source of these particles. 

   Posted are a 5 day trend of these four dust monitors and wind at the CS.   

Maintenance Discussion:  Aiming for short day, but if we have long tasks, it could be allowable.

• TCSy Flow Sensor (Jason)
• PSL Injection, requires H1  (Robert)
• Magnetometer L2 Coil Driver or replace the Driver (Robert, Fil)---> Will address today
• Upgrade software on rate controller for file server, first thing in the morning (8-8:30, Carlos)
• iMac replacements in Control Room (Carlos)
• 2k IMC tube run pump carts for 4hrs(kyle)
• RefCav touchup (Peter)
• Dust Monitor test (Jeff)
• Curtains in LVEA (Jeff)
• Access System work (Fil)
• ITMX oplev (jason)
• Contractor cutting ashphalt at vpw (bubba)

Went over Work Permits.

The philosophy for the PSL is to have all the systems the same as possible. With the help of folk from LHO I've attempted to summarize the differences in the site PSL's as they currently stand. This will hopefully help track all the differences so we can converge again at some stage and also help with noise hunting and why might see something at one site and not another.

See T1600592. I'm hoping for this to be a living document and as new changes are made, or old changes reverted, that this is tracked here

PIT:

• Most are flat. 
• BS has had a step down over last few days and is around -7.

YAW:

• ITMx has now went below -10  (Jason mentioned addressing this tomorrow for Maintenance Day)
• HAM2 is beyond -20

This CLOSES FAMIS #4706

TITLE: 12/19 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 66.0999Mpc
OUTGOING OPERATOR: Ed
CURRENT ENVIRONMENT:
    Wind: 3mph Gusts, 2mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.49 μm/s, with a slight trend up over last 12hrs
QUICK SUMMARY:
Locked for almost 10hrs, albeit glitchy.  Temperatures a balmy 16degF this morning.

Andy, following work from TJ and Josh

My best guess for the cause of the extreme glitchiness is an electronic problem in the ETMY L2 driver. I think TJ and Josh were thinking the same thing, but I don't want to speak for them.

We've been seeing the glitchiness get worse and worse at LHO for at least a week. These are short glitches, and now they are loud and frequent (once every few minutes at least). The humidity has been dropping as the weather gets cold, and last winter Robert and others showed that was correlated with increases in these kinds of glitches.

We also see that the only associated channels are the ETMY L2 noisemons. These do see the drive signal, so they will show glitches whenever DARM does. But these are very loud. And I quickly developed some code to measure a transfer function from a few weeks ago, and use that to subtract out the drive signal. The subtraction seems to work well, but the glitches get shorter, sharper, and louder.

So my hypothesis would be that the low humidity is exacerbating an electronics problem in the ETMY L2 driver, maybe due to sparking. While LLO is down, would it be possible to replace the driver with a spare, or at least try to diagnose whether it is working properly?

The transmission through the reference cavity has deteriorated somewhat since the last touch up alignment
last week.  Went through the usual signals to see if anything matched up.  Nothing from the usual signals.
However this time there seems to be coincidence with the horizontal output of the quadrant photodetector
in the ISS box.  That in turn implies that the pointing out of the pre-modecleaner changed.

    The change in horizontal seems to coincide with the drive voltage to the pre-modecleaner heater.  From
the cavity transmission camera, it is obvious that the alignment has drifted in both pitch and yaw.

• H1 locked and Observing @ 67.169Mpc 5hours:46minutes
• DIAG_MAIN still reporting IM1 PIT is out of nominal range of 185. (carried over from Day shift)
• GWIstat not reporting correctly aLog. Peter Shawhan responded.
• Dust monitors 6&10 in LVEA; EY; PSL giving alarms throughout the shift
• Monitoring H1:OMC-DCPD_A_IN1 AND H1:SUS-ETMY_L3_ESDOUTF_LL_OUT during active glitching doesn't show any indication of saturation.
• There have been about a dozen EY glitches

I noticed that GWIstat screen is reporting that H1 is NOT OK. I think this may have something to do with ODC bits not being "happy"? I checked the ODC overview and noticed some flashing of bits 10 and 31 in the ASC_ODC screen that has the status flashing between Green and Red. Maybe this is an issue maybe not. In any case, the intent bit is set to Observe but GWI says we're NOT OK. 

After a visual inspection of the Kitchen, Bathrooms and some of the offices, THere was no sig of any new water leaks. All fans were running. That's about it.

State of H1: Observe

Activity:

• 04:51:14UTC - H1 lock loss
• adjusted IM1, IM2, and IM3 alignments - target Dec 8th, as shown on medm under IO, I think their still good
• relocked
• HAM6 ISI tripped while shutter was tested
• 07:05:04UTC - H1 in Observe
• 7:33:50UTC -GRB alert

Attachments:

• 11 days = IM alignment, IM4 Trans, and ISS2 - ISS2 yaw has changed, but look at the next plot of IMC
• 11 days - IMC optics - MC1 pitch and yaw have changed 20urad, and this is down from the peak, where the change was about 25urad

State of H1: in Observe

TITLE: 12/18 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: OBSERVING
INCOMING OPERATOR: Cheryl
SHIFT SUMMARY:

H1 continues to glitch.  Been up for 7hrs.  Fair amount of activity on a Sunday here due to burst pipe at the LSB.
LOG:

• EY Saturations:  17:18....many.
• 16:37 EY Instrument Air
• 17:07 OBSERVING
• 17:55 "EY temperature is high" Verbal Alarm
• 18:25 Bubba & John moving from EX to EY Air Handler Room (no VEA entrance).
• ~20:00 Sometime around noonPST, Hanford Fire Truck was driving around the LVEA.  They are here to work with Bubba on a -2nd pipe burst- at the LSB.
• Getting "IM1 P is out of range" DIAG_MAIN messages.

While OBSERVING with a glitchy H1 for the last 19hrs, there was mention of a possible culprit being noisy violin modes. 

Before taking any action, I consulted with Keita (Run Coordinator) to ask whether this would be acceptable (because L1 is currently down and we would not jeopordize double coincidence).  Keita pointed me to a note about diagnosing violin modes here, (alog 32615).  So, I went through is diagnostics for determining whether we have ADC or DAC saturations (which is a main symptom of big violin modes). 

Diagnostics for saturations due to violin modes:

1)  Make sure OMC DCPD is far from +/- 32k, and ESD is far from +/- 131k, and this can be checked via timeseries. 

2)  Make sure there are no large values for a a spectrum of these channels

Both of these measurements are attached, and I believe they look OK (please check me on this).  So I will not bother with an attempt of violin mode damping.

H1 has been locked for almost 4hrs.  It continues to be a bit glitchy.  L1 continues to be down for high seismic.

LSB Burst Pipe recovery work continues.