TITLE: 05/24 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 106Mpc
INCOMING OPERATOR: Ed
SHIFT SUMMARY:

H1 has been locked for 33+hrs.

useism has leveled off after taking a step up earlier today (in between 50th & 90th percentiles).
LOG:

• 22:51-22:54 Out of Observing due to unlocked Squeezer.
• 22:55 Begin to see effects of storm passing through (mainly with wind & possibly some glitches on H1).  By cameras, looks like this storm just touches EY and bulk of storm heads toward Richland bypassing the rest of LHO.
• 23:00 MY turbo pump work continues (Kyle, Gerardo)
  • 23:25 Gerardo done, 23:38 Kyle done.  Work complete for the day.
• 23:43 Sharan noted 1kHz a little noisier via the GDS Calib/Strain spectrogram for the H1 Summary Page.  The 2nd Harmonic looks OK on the DARM spectra (it is below reference).  Will keep an eye on this in case action is needed.
• 0:05-0:13 Went to check on TCS chillers.  TCSy was at 9.5cm (did not add any water)
• 0:46 GRB Stand Down begins.  (announced alert on Control Room Teamspeak channel...LLO also received alert).
• 4:48 FMCS MX low alarm

TCSy started out the shift around at around a level of 9.5cm & at the end of the shift it was still at 9.5cm.  Since I was there, I topped it off with ~210mL to get it to 10.1mL.

TCSx looked fine, so no change made.

TITLE: 05/25 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 106Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    Wind: 4mph Gusts, 3mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.25 μm/s
QUICK SUMMARY:

h1 is approaching 30hrs for this lock.  useism has shown an increase over the last 6hrs, where we are clearly aboe the 50th percentile.  

The 1kHz line on the gravitational strain spectrogram does not look as pronounced now 4hrs later.

Gerardo M., Kyle R.

The mounting method used by our yet-to-be-installed, next generation, Main Turbo Pumps (Pfeiffer) utilize a mounting bracket that is integral to a vacuum spool that connects to the turbo pump's inlet flange.  The fabrication of the initial units did not observe acceptable vacuum weld norms and had been rejected.  Today we removed the rejected unit from the Y-mid Turbo Pump and installed the revised version of this part.  

Kyle R.,

Using a calibrated leak detector as a backing pump to the spinning turbo pump, I sprayed an audible flow of helium slowly around the periphery of both flanges of this new part and found no leak(s).  The helium baseline remained in the low 10-10 torr*L/sec during testing. 

NOTE:  This Pfeiffer Main Turbo Pump Station is free standing in the VEA and is not connected to the Beam Tube.  Also, we operated the overhead crane in the Y-mid VEA sporadically between 1417 - 1543 hrs. local time

TITLE: 05/24 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 107Mpc
OUTGOING OPERATOR: Jim
CURRENT ENVIRONMENT:
    Wind: 20mph Gusts, 16mph 5min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.21 μm/s 

Rainstorm was hovering over Rattlesnake, but have not seen approaching EY (via camera) yet.  (winds are picking up a little)
QUICK SUMMARY:

As with some shift changes before, walked in to see H1 out of OBSERVING--Jim was monitoring the SQZ recovering from being unlocked (as we both said our "hellos", all the SDF diffs disappeared as the SQZ relocked itself...and Jim returned us to OBSERVING).  Lock is currently 10min approaching 26hrs with a current range of 105Mpc (I see Robert watching the DARM spectra, walking outside a few times, and mentioning glitches.  We do see wind gusts getting up to almost 30mph!

Gerardo just reported he is ending his work at EY, but Kyle is still down there (this is prep work [w/ some crane use] for a Turbo Pump to be installed at a time tbd).

TITLE: 05/24 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 58Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY:
LOG:

22:54 SQZ unlocked, dropped us out of OBSERVE, then relocked after a minute or two, back to observing

All seem to be within spec.

These plots have an updated calibration. Previously, my script had just used a static gain on 1e-9 to get m/rthz, which is wrong. The cps actually need a .14hz pole and 1.4hz zero to be calibrated to nm, with a gain of 3 for the coarse cps and .7 for the fines. Applying this calibration in python has proved more than my meager abilities for now, so I've just applied the gains to get the calibration right above 10 hz, as noted on the plots. I'll try to figure out the rest down the road.

TITLE: 05/24 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 104Mpc
INCOMING OPERATOR: Jim
SHIFT SUMMARY:

Quiet shift. Handingoff Locked H1 to Jim
LOG:

1 hr standown begins.

TITLE: 05/24 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 109Mpc
OUTGOING OPERATOR: Travis
CURRENT ENVIRONMENT:
    Wind: 15mph Gusts, 12mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.16 μm/s
QUICK SUMMARY:

H1 locked and Observing.

TITLE: 05/24 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 109Mpc
INCOMING OPERATOR: Ed
SHIFT SUMMARY:  Lock is 9.5 hours old.  No issues to report.
LOG: 

Porcupine spotted on back patio.  We also saw it last evening. 

TITLE: 05/23 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 114Mpc
OUTGOING OPERATOR: Jim
CURRENT ENVIRONMENT:
    Wind: 15mph Gusts, 13mph 5min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.18 μm/s
QUICK SUMMARY:  Lock is 1.5 hours old.  No issues were conveyed.

TITLE: 05/23 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 112Mpc
INCOMING OPERATOR: Travis
SHIFT SUMMARY:  Difficult locking today
LOG:
15:50 lockloss becaue I went to LARGE_EQ, instead of EARTHQUAKE

The rest of the day was spent trying to relock, ASC was difficult for no identifiable reason

Just had some unexplained sdf diffs show up after the last re-locking. 2 trigger thresholds in IMC MCL, which were changed about the time of the last lock loss, which did not have an obvious cause. No idea if these are relevant or what caused the change.

[Gabriele, Marek]

The 60 Hz line is quite large and accompanied by sidebands that spread over a 4 Hz band around the line. Those sidebands look like modulation of the 60 Hz line by IFO motion.

We used the machinery of non-stationary noise subtraction to see if we could subract the broad noise around the line. Details in the links below [1-3].

We used H1:GDS-CALIB_STRAIN for the sensitivity and H1:PEM-CS_MAINSMON_EBAY_1_DQ to measure the 60 Hz line. Then we used all ASC input error signals to describe the modulation.

The algorithm builds a parametric description of the modulations. The result is shown in the first plot attached below (blue and orange are equal and are the h(t) signal before subtraction, green is the best subtraction with only the linear coupling of the PEM mains monitor, red is the best subtraction when including non-stationary modulation due to ASC signals).

The second attached plot shows each contribution: apart for the reference signal, each trace corresponds to the PEM mains monitor modulated with one of the ASC signals with optimal time-domain filter.

[1] NonSENS code https://git.ligo.org/gabriele-vajente/nonsens
[2] Subtraction of non-stationary noise couplings https://dcc.ligo.org/LIGO-T1800525
[3] Non-stationary / non-linear noise subtraction https://dcc.ligo.org/LIGO-G1900397

A long time ago I came up with some blend filters to try to improve the 1-10 hz HAM RX/RY motion, to try to reduce SRCL. We ran the filter for about a week last October, but I've been having trouble trying to find good data to compare to the current configuration. Sam Cooper has a document comparing the differences and some of the motivation for finding a better filter at https://dcc.ligo.org/DocDB/0159/T1900107/001/main.pdf. I've switched HAMs 4&5 RX&RY blends to this filter to get some data overnight (or weekend). I made the transition while Corey was locking the IFO, and it's running fine for now. I've accepted the differences in SDF, so this shouldn't prevent us from going to OBSERVE.

The new blends are called "between_350" on the HAM ISI blend screens. If there is some issue where SRCL motion is bad, the old filters are called "notch_rolloff". If there are any questions or anyone needs help reverting over the weekend, give me a call.