I don't think I had focussed the input arm cameras yet when Sheila made this log about moving CPs, https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=30979, so I offset CPY to see if I could see where the light was hitting. I could see a moving spot on an apparent table weight in front of the PR2 scraper baffle (screenshots show nominal and pitch of -150 on CPY, bright spot is at the very bottom of nominal image). However, I could not see it on the "swiss chese" baffle in front of HAM2 when I looked through a viewport, so it is likely dumped on the vacuum enclosure near HAM3 or the "eye" baffle between HAM3 and the long IMC tube, and from there reflects onto HAM3. Sheila's 0.1 Hz excitations did not show that this was a current problem. Nevertheless, from looking at the camera, I agree with her that a lower-scatter parking place is at CPY pitch < -70. This might also give us even more head room for some of the ~100 Hz scattering associated with vibration excitation of the input arm vacuum enclosure.

Locked at NLN since before my shift started.  Lost lock at ~3:30UTC for unknown reason.  Sheila did a bit of IMC work during the downtime.  Seems to be relocking nicely at the moment.

TITLE: 11/05 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 68.2743Mpc
INCOMING OPERATOR: Travis
SHIFT SUMMARY:

H1 locked most of the shift and getting back to NLN wasn't too tough (other than a Beam Diverter issue, which is noted below).

LOG:

• Bubba on-site checking for possible water leaks.
• 16:17 Robert checking out REFL DC pd (thought he could break lock, but he did not.)
• 16:53 Topped off PSL Chiller (Corey)
• 17:37 Robert heading to End Stations for PEM Injections
• 17:54  I forgot to drop us out of Undisturbed/Observing & we went to Commissioning at this time.  Really, Commissioning should have been set at 16:17!
• Phone at EY not working
• 19:09 Transitioning SEI to WINDY NO BRS X since Robert just arrived at EX.  Have started receiving EX & EY saturations while I was on the phone with Robert and just after I made this transition.  We are at hight useism (which is new).  So yeah, it appears without the BRS & this high useism that H1 becomes pretty glitchy.
  • NOTE:  I forgot to turn off the BRS for Y when Robert was at EY!  Did not receive any EX/EY saturations when he was down there.
• 19:24 SEI Transistioned back to WINDY by Robert at EX.
• 19:53 Went to UNDISTURBED/OBSERVING, but quickly un-did that because Robert said so.
• 20:38 Lockloss.  When coming back up, Diag_main mentioned X-arm fiber polarization above 20%
  • Stuck in Locking ARMS Green with a "waiting for arms to settle".  ALS X was stuck around 0.8...touched it up to 0.98 by tweaking the TMSX in yaw & this got us to move on.
  • Sheila just happened to walk in and I mentioned this to her, and she said we should just change the value Guardian waits for here (0.9 something) since we have lowered the laser power.
• 21:08 Sheila is now taking H1 to look at IMC WFS.
• 22:42 - 22:46 Running A2L (...LHO.py)
• 22:47 - Running A2L (...PR2.py)
• 22:4 - Running A2L (...PR3.py)
• PI Mode 28 rung up.  Took phase from 180 and eventually to 110 & it's looking good.
• Handing off a locked at NLN H1 to Travis (range is hovering around 73Mpc).
• Oh, we lost lock during acquisition earlier due to the Beam Diverters (this is related to what PDs we were using between acquisition & low noise).  To get past this, I:
  • went to NOISE_TUNINGS
  • Go to MANUAL
  • Select REDUCE_RF9_MODULATION_DEPTH (skipping Close Beam Diverters step)
  • Then hit AUTO after the above step is green/complete

NOTE:  Bubba would like a rough idea of # of people here between now and tomorrow. (we had 2-3 people most of the day)

• H1 is going on an 11+hr lock hovering around 68Mpc.
  • Forgot to turn off BRS at EY, but turned it off for EX where he currently is.
• Robert continues PEM injections at end stations.
• Bubba has water off at the LSB & OSB.

While turning off unneeded lights for the weekend, I checked the PSL chillers.  I went ahead and topped off the crystal chiller with 175mL since it was around 1/4 full between min & max.

Before driving in this morning, I checked the H1 Summary Page.  This page has been down for almost a day (L1's Summary Page appears to be fine).  

• I sent an email to the LHO CDS Admin group (not sure they are responsible for this page though).  
• On the H1 Summary Page, there is a "Report An Issue" link on there.  After a few minutes, I received the email verification (but it did not like my ligo-wa.caltech.edu, so I added my ligo.org email & then it worked).  I have reported the issue (I was wondering if there is someone we should email about issues with this page as well...or is the "Report An Issue" link best?)

TITLE: 11/05 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 68.4202Mpc
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    Wind: 7mph Gusts, 3mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.67 μm/s
QUICK SUMMARY:

TJ handed over a nicely locked & steady H1 (flat and only 1 visible glitch on the range); been Undisturbed for last ~7.5hrs (the Observatory Mode was set to Locked, but I set it to Observing.)

Other Notes:

Robert is here and would like to do PEM Injections with a locked H1.

Bubba is on-site to search for possible leak in the water system.

H1 Summary Page down (making separate alog).

useism is high (~0.6um/s).  But our handy SEI CONFIG says we are good at the WINDY state (until we get up to 1.0um/s).  Staying put.

TITLE: 11/05 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Lock Aquisition
INCOMING OPERATOR: Corey
SHIFT SUMMARY: Lost lock as I sat down, the ITMY swinging happened to me as well. Misaligning and aligning didn't seem to help, but it eventually damped on its own. Then went up to Coil Drivers before it lost it again, but brought it back to NLN and it has been sitting there since with the intent bit Observing. I was planning on doing some tasks for commissioners but couldn't connect to the oscope, and I didnt want to go into the LVEA to disturb the lock. I will try these tomorrow.

LOG:

• 08:34 Observing
• 10:02 GRB

Up and observing for a bit while it looks like livingston is about to be up, then I'll drop the intent bit to do some tasks from commissioners.

TITLE: 11/05 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Aligning
INCOMING OPERATOR: TJ
SHIFT SUMMARY:  IFO has been up and down all night for various reasons.  After 2 of the 4 locklosses, ITMy swung around for a long time, slowing relocking.  Stefan looked for the cause but was unable to find one.  Also, the ASAIR and POPAIR signals have been oscillating during full lock.  Matt and Stefan are looking into the cause of this, but as of the end of my shift have not come to a conclusion.  I ran A2L for 2.5 of the locks, the 0.5 being that I was halfway through the 2nd script when we lost lock.  Stefan said that it was useless to run A2L with the AS and POP oscillations, so I haven't run it for the last lock.  Microseism is still above the 90%ile level.  Wind is calm.  Locked at ~70MPc.
LOG:

23:59 Updated LSC and ASC SDF OBSERVE.snap files per Hugh's request.  If the Owl shift operator has a lockloss, he'd like to update the LSC and ASC DOWN.snaps as well.
 

Evan, Stefan, Matt (writing)

We've been seeing for a few days the bouncing of the harmonics of the 1kHz violins (exact harmonics, not higher violin modes).  Watching these on a fast spectrum shows an ~18s period, in which the harmonics appear out of the noise and grow by more than a factor of 10 as the beating at 1kHz reaches a maximum.  The 1kHz peak (in which the violin modes are unresolved) is only changing by a factor of about 5 (see attached).

We noticed that the sidebands buildups started to oscillate at the microseism once we switched to low-noise (lower ASC bandwidth ?). We suspect something with ITMY or its suspension is mistuned, because it would hardly damp after4 lock-loss. Not sure whether it is related.

Stefan, Kiwamu, Matt

To test the theory that the ILS is gain limited, and that more gain might help with DARM noise, we measured the loop and used the TF input to add some gain at low frequency.

The open-loop TF was as previously reported (see 31121 and photos to follow).  We had computed that an SR560 with a gain of 10 and a pole at 100Hz accompanied by a 10kHz passive low-pass would make for a good test without destabilizing the loop (see attachment 1).  With this test-rig attached the TFB and TFIN ports on the ILS front panel (photos to follow), we relocked the IFO and found that the coherence with DARM had been reduced as expected (see attachment 2).  Noteabley the PMC HV signal was significantly reduced (black to brown in attachment 2), indicating that this gain was preventing noise in the PMC.  Unfortunately, this simple test was not able to apply much gain to the 1kHz, where the highest coherence with DARM is seen.

Kiwamu has offered to investigate the possibility of using a new CDS FE running at 65kHz to implement a tailored gain profile which will suppress the 1kHz peak and other HPO features while keeping the ILS loop stable.

As Sheila pointed out, back in May we had a 25W lock that lasted >5h and never showed any indication of jitter peaks.

The attached plot 1 shows spectra from May 17 (25W), July 16 (40W) and Nov 3 (25W). Note that the May 17 spectrum is taken 4h into the lock.

Plot 2 shows inputy power and range of the May 17 lock.

Plot 3 shows all TCS settings of the May lock.

Plot 4 shows all TCS settings currently used.

Based on this, I would like to turn off the ITM ring heaters.