While the laser was down this morning, I took a quick measurement of the ETMX pit oplev damping loop.  It has about 5 dB of damping in a narrow range around 0.46Hz, and has zero phase and -10dB of gain at 1.5 Hz with no light in the arm.

Because the noise from these loops is limiting DARM at 10 Hz (alog 34735), I made a slightly more aggressive cut off (LP8 is intended as a replacement for LP10) which can be tried next time we have a chance.  This is the reason there are unloaded changes in the filter files for all 4 quads right now.

Very good, quiet 4 days. Overall duty cycle was 91.4%, with range reaching just over 70 Mpc at times

- 2 24+ hour lock stretches

- Some wind issues Thursday morning (UTC) and Saturday evening (UTC)

- Strange trend in low-frequency noise on Sunday: started low, peaked at 0800-1000 UTC, then came back down slowly; possibly periodic with 24-hour period, uncorrelated with microseism

Full DQ shift report here

Summary of the data quality shift for Monday March 13 to Wednesday March 15, 2017 (inclusive):

• Excellent duty cycle of 75.44% overall. Monday 3/13 and Tuesday 3/14 were very stable and uneventful up to the start of planned maintenance, which took place during the late afternoon and evening on Tuesday.
• During the maintenance window, flow sensors for the laser head were replaced which will hopefully help prevent lock loss from PSL tripping.
• Wednesday 3/15 saw high winds which generated ground motion and affected the BNS range.  
• PI modes caused two lock losses on Wednesday 3/15.
• Nothing else appears to stand out from this shift; it was a pretty quiet couple of days overall.
• The full data quality shift report can be found here: https://wiki.ligo.org/DetChar/DataQuality/DQShiftLHO20170313

In the MAIN SITEMAP area under the second PEM pulldown select Weather Wind for Ski's direction/speed plot.  The arrow directions needed updating to reflect Robert's remapping (LHO aLog 28456) of the anemometer directions.  These can be a bit confusing as wind is typically described as 'being from', e.g., a west wind is from the west.  But these arrows point toward the direction the wind moving toward so that should be intuitive.  The numbers can be confusing though with 0 being from the CS to EndX and CW from there.  So a number like 180 might be thought of as a south wind but it is actually wind moving from EndX toward the Corner Station.  Enough words.

Starting CP3 fill. LLCV enabled. LLCV set to manual control. LLCV set to 50% open. Fill completed in 53 seconds. LLCV set back to 16.0% open.
Starting CP4 fill. LLCV enabled. LLCV set to manual control. LLCV set to 70% open. Fill completed in 129 seconds. TC A did not register fill. LLCV set back to 43.0% open.

We took a few minutes to do excitations on HPI HAM1+HAM6 before going back to observing.  This was to follow up the measurements made in 34623.   Robert observed that some of the upconversion that we have been having in DARM in times of higher 3-10 Hz ground motion has harmoincs of 11.6 Hz, so one suspicion could have been that this is a multiple of the tip tilt resonance around 6Hz, and this would have been missed by the excitations that concentrated on 10-40Hz.  However, we found nothing resembing this up conversion.  As we knew HAM1 motion does get into DARM at lower frequencies. (probably through CHARD)

PSL tripped. We were observing for a total of 2min and 27sec

This morning I saw some noise in the 60-200Hz area on DARM that lastest for a few minutes and then went away. I came back about an hour later, and an hour after that as well. The SEI BLRMS are clearly coincident with this breathing noise, and with the slight drop in range. Robert is thinking this may be tilling or truck traffic on the Hanford site.

I attached a plot of some of the BLRMS. It is seem the most in the corner station, but the ends see it a bit as well.

Laser Status: SysStat is good

Front End Power is 34.12W (should be around 30 W)

HPO Output Power is 163.8W

Front End Watch is GREEN

HPO Watch is GREEN

PMC: It has been locked 5 days, 21 hr 27 minutes (should be days/weeks)

Reflected power = 16.03Watts

Transmitted power = 64.35Watts

PowerSum = 80.38Watts.

FSS: It has been locked for 0 days 0 hr and 45 min (should be days/weeks)

TPD[V] = 3.319V (min 0.9V)

ISS: The diffracted power is around 2.0% (should be 3-5%)

Last saturation event was 0 days 0 hours and 45 minutes ago (should be days/weeks)

Possible Issues:

Our good friend Arnaud made an medm showing the BLRMS motion of all the ISI platforms:

"I made a medm screen to show the performance from all platforms at once.

This should help when trying to catch a problem like we had last month with elevated HAM6 motion (https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=31831)

The file lives under the svn at /opt/rtcds/userapps/release/isi/common/medm/graphics/grid_all.adl (or grid_mini.adl, a smaller version).

and only needs the site/ifo variable as an input (which the sitemap should provide).

At LLO it is currently under sitemap->ISI->PERF_OVERVIEW"

These BLRMS performance views are all visible on the ISI platform overview screen but having them on one screen should be useful.  I've updated the H1 area with this file and edited the SITEMAP.adl; LHO Operators can find it in the MAIN area under the SEI pulldown at PERF_OVERVIEW.

Remember green is good, red is bad, yellow and orange in between.  See attached.

model restarts logged for Sun 19/Mar/2017 - Tue 14/Mar/2017 No restarts reported.

Ran well over the weekend.

Went over maintenance items for tomorrow (see whiteboard for plans).

There are also a few commissioning, calibration, and PEM items that will require time with a locked IFO either tomorrow or over the week.

not sure of the cause yet. The 60-200Hz noise came back a few times before the lock loss, maybe related?

Adjusted the PSL Beckhoff computer time to daylight savings.  The clock was about 10 minutes off in
addition to the hour.

EX had a dip in pressure around March 9th from 97.7 to 97.5, but other than that all looks good.