TITLE: 12/10 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Earthquake
INCOMING OPERATOR: Jim
SHIFT SUMMARY:

Once I sat down to H1, able to get to NLN with no issues.  Have had a handful of EYSaturations during this lock.  Seismic trends are steady & winds are getting quiet.

LOG:

• Locked up H1 (only really needed TMSx tweak, and the usual BS & PRM adjustments).
• 1:02  Undisturbed
  • Mode28 was acting up and I hammered it down as soon as I could (fairly easy)
  • Then Mode27 slowly started acting up.  It took me about 35min of work to get it to finally drop & stay down.  I tried addressing it before the alarm came on (as I did for #28).  This was the 18038Hz mode.  I tried phase changes with only a little bit of luck.  Then I adjusted the gain.  And then I tweaked on both.
• 2:32:  Out Of Observing.  Ran A2L
  • For Observatory Mode, I wasn't sure what to select....I figured Calibration or Corrective Maintenance.  I opted for the latter, but now I'm thinking I should have selected "Calibration" (we should really have a differnt name for this one...something like "OBSERVATION MEASUREMENTS" (so Calibration, injection, A2L, and the like could all be inclusive).  CORRECTIVE MAINTENANCE implies a failure and thus an FRS (I did not file one).  
• 2:36:  Back to Observing
  • 3:04 Rode through an EQ
• Adjusted the PSL Dust Monitor #101 Alarm Levels

Since we've been having constant Dust Alarms for the PSL Enclosure (#101), looked into trends over the last 2 months (looked at #101, wind, and some FMCS/HVAC channels).  

• HVAC:  Can see an increase for the heater (which is no surprise and probably connected to the cooler temps). 
• Wind:  Hard to see a correlation with wind
• Dust Trend:  Sort of uniform fluctuation there.  Atleast for the last 2 months, it appears the Alarm levels seem to be low and within the noise of normal operation.  

Since the levels as they currently are I wanted to inch them up a little (by x2).  This will help to reduce the constant alarms we get and prevent us from ignoring them.  But it is a small enough bump that we'll still get them when we are at higher levels.  Since there has been no change post-cleaning on 12/5, Jeff should investigate the air filtration system for the PSL.  Do we have requirements for cleanliness levels for the PSL Enclosure? 

Alarm Setting Changes

0.3um:  MINOR:  70->140  &  MAJOR:  100->200

o.5um:  MINOR:  70->140  &  MAJOR:  100->200

Locked for 3+hrs.  Rode through a couple of Solomon Island rumblers (L1 went down).  Also ran an A2L an hour or so after this lock (right as L1 was joining us).  H1 started off at a high range (almost 80Mpc, slowly dropped around 65Mpc & is back up to around 73Mpc.  Smooth saling.

As soon as H1 went up, L1 went down.

EQ levels subsided so immediately proceeded with locking (only hitch was a low X-arm for ALS & this was remedied with a slight TMSx tweek).  Made it to NLN with no issues.  

I saw we had quite a few Test Points open on the CDS Overview (some were 20+ for some PEM front ends).  I went about running a TP Clear on all of them (except H1CALEX which had 1).  In case you were interested the frontends I did a TP Clear on, had the following DCUIDs:  24, 30, 31, 75, 50, 54, 55, 60, 98, 99, 80, 118, 10, 19, 121, 88, 89, 91, & 84.

Shortly thereafter, I hammered down the MODE28 PI before it got raucous (phase sign flip).

Range is hovering around 75Mpc.

Transitioned OBSERVATORY_MODE from EARTHQUAKE to OBSERVING.

Looking at Violin Mode peaks on DARM, we have:

• primary at 1x10^16
• secondary at 4x10^16

TITLE: 12/10 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Earthquake
OUTGOING OPERATOR: Jeff
CURRENT ENVIRONMENT:
    Wind: 10mph Gusts, 6mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.34 μm/s
QUICK SUMMARY:

• Seismic trends look to be recovering from the EQ, so hope to get back to locking ASAP.
  • ALSX was low (~.75), from Jeff's suggestion, I tweaked the ETMx & TMXx (latter took us up to 0.97)
• Noticed:  (2) DIAG_MAIN messages for TCS:  TCS_HWS: HWS[X/Y] Code Stopped Running.  Called Nutsinee & she said this won't impact Observing operations.  She and Dave will work on this on Monday.
• Kyle at MY (left site at 0:31)
• VAC MAJOR alarms for PT180 (@BSC8) & CP4, but these are known.
• Looking like a quiet night with snow on the ground.

Shift Summary: The IFO was locked and observing for the past 5.5 hours. At 19:23 lost lock due to a Mag 6.9 EQ near the Solomon’s. Primary microseism is up to 8.0um/s, secondary is 1.5um/s. HAM6 ISI was the only tripped. I put the SEI_CONF LARGE_EQ_NOBRSXY.  

Put the SEI_CONF back to WINDY. Microseism has calmed down. Start relocking.     

Double the fun!

1:30 pm local

Finished installing TCs at CP4 exhaust. Needed to swap TC wires at beckhoff rack.

CP4 took less than 1 min. to overfill at 70% on LLCV. Returned to nominal 38%. I filled CP4 from beckhoff console at MY to verfiy LN2 flow out exhaust when TCs read below -30C.

CP3 took 36 min. to overfill at 50% on LLCV. Nominal at 19% (from previous 18%).

Dave Barker pointed out that CP3's Dewar level readback is noisy as he was writing an alarm script that looks at slope. Trending back 3 years, it looks like this noise comes and goes with cold weather, and is somewhat diurnal.

   IFO has been locked and Observing for 5.5 hours, when lost lock due to Mag6.9 EQ near the Solomon Islands. Primary microseism remains high but is starting to come down. Should be able to try relocking soon.

Attached are plots of the reference cavity transmission for the past week.  Plotted along with
the laser room temperature, and the reflection locking photodiode output.  The decay is not due
to any degradation of the pre-modecleaner transmission.

    Correction almost always involve a pitch alignment correction, most of which is the top
mirror mount in the periscooe.

Terra asked detchar to investigate whether changing PI damping settings might cause glitches. Conclusion - they do not, at least for the examples I've seen.

I looked at 22 examples from alogs 31892, 31824, 31560, 31516, 31485, 31461, 31444, 31440, 31191 where operators reported changing the settings on modes 3, 26, 27 and 28 in either/both phase and gain. I plotted a 10 minute timeseries around the times reported in the alogs of channels SUS-PI_PROC_COMPUTE_MODE#_DAMP_GAIN and SUS-PI_PROC_COMPUTE_MODE#_PLL_PHASE and a spectrogram of GDS-CALIB_STRAIN of the same time. Two of the times I could not find any change in either the phase/gain so I really only looked at 20 examples.

Attached is an example where both the phase and gain of mode 28 were changed by the operator in alog 31485. The change in gain and phase makes no obvious glitches/change to the spectrogram. All other exmaples I have seen show no obvious change either. When pycbc live triggers have been available (because they only get generated when we're in oberserving) I can not find any noticeable change.

If you really want to look through all the plots yourself they are here. 

Ran LOAD on the SUS_PI Guardian to load new code, per Owl Shift operator.

At 19:23 lost lock due to a Mag 6.9 EQ near the Solomon’s.

Primary microseism is up to 9.0um/s, secondary is 1.5um/s. HAM6 ISI was the only trip. I put the SEI_CONF LARGE_EQ_NOBRSXY.     

Posted are the OpLev trend plots for the past week. The BS summary plot show a steady downward trend. FAMIS #4705

   Posted are the plots for the CPS Sensor Spectra. 

We have a diagnostic setup at BSC8 that we need to run for several consecutive days.  This setup utilizes rotating shaft vacuum pumps that have the potential of effecting the IFO data.  Prior to the start of O2, we had Robert S. monitor the IFO signal(s) while it was locked and in "Low Noise" both with the pumps on and also off, i.e. we did "on/off" tests (see alog entry 31802).  Additionally, and on more than one occasion, we had ran these for several consecutive days during which the IFO experienced long lock stretches at good sensitivity.  As such, we were hoping that someone could examine the pertinent IFO data during the following two time segments to look for any evidence of these pumps running.  In both cases, the pumps in question were running continuously:  


November 24th, 0230 UTC to November 29th, 1800 UTC and

December 5th, 1900 UTC to December 7th, 0035 UTC.  

It seems like there are some PI modes that we are no longer damping that are slightly run up according to the dtt. I also wonder if the peaks at around 13000hz are modes that we had not had issues with before, or maybe something else entirely? I don't see any mention of them on the PI medm and they are currently the highest. I will try to damp some of the other ones if they get any higher.

The attached shows the PI dtt just after reaching low noise.