Our noise at 35W is now similar to the noise at 25Watts, and the extra power might be giving us some range. 

ILS gain helped:

The first screenshot shows that the ILS gain has a more dramatic impact at 35 Watts than at 25W (31223).  If it is possible to boost the gain in this servo more at frequencies below 1kHz, this will help our noise at 35W and higher.  

IMC WFS offsets

The second screenshot shows a comparison of several spectra, the main point is to show that we can power up to 35W without making the accoustic peaks worse (and with some of them actually better), with the combination of more ILS gain and IMC WFS offsets.  I started with the offsets that Jenne used last night 31221  I think that for PIT, nothing in DOF2 is fine, and I think that 400 in DOF1 is a little better.  For yaw, I didn't see much impact from offsets in DOF1 oe 2, but there might have been a small improvement using positive offsets (I ended up at 0.55, but could have gone further).  I moving IM3 P (away from its rail) to mimic the move that the IMC WFS made on IM4 trans, but this had no impact on the IMC PZT jitter coupling to DARM.  

The third screenshot shows comparisons of spectra and coherences before and after the IMC WFS moves.  The low frequency improvemenmt in DARM is just from running a2l.   The IMC shift increased both the intensity noise and the frequency noise, suggesting that what we are doing with these offsets is creating intensity noise in just the right way that it cancels some other noise, like frequency noise, in DARM.  You can see that the coherence with the ILS is reduced by the IMC WFS move.  In the 4th screenshot you can see that the move decreases the coherence of REFL control with DARM, but at the 260Hz Refl control becomes coherent with the intensity noise. We have convinced ourselves that both frequency noise (31176) and intensity noise (31186) are well below DARM, but we might need to think a bit harder about that. 

For anyone who is curious to look at this data: the after the IMC move time was 6/11/2016 03:21:00 UTC, you can get 30 averages at 0.1Hz BW without seeing noise from Robert's injection which is visible in DARM in the 4th screenshot, the before time is 01:34:47, and you can take 100 averages at that time. 

IMC WFS oscillation:

The IMC WFS have been osciallting at the microseism, I think this was contributing to the difficulty transitioning to POP X WFS.  I turned the overall gain of the IMC WFS down from 0.1 to 0.04, you can see the impact in the 5th attached screenshot.  This gain is before the offsets we have been adjusting, so the DOF1P offset which was originally 400 should now be 160 with the new gain ect.

Other things done today:

• I set the CO2X power to 0.3W in the guardian, because that seems better for 35W and Kiwamu had said that it was also better for 25W.  
• We commented out the POP beam diverter, so the noise from ISCT1 is visible in DARM.  I was hoping to try looking at the REFL WFS signals again to see if we can go back to them, but didn't get a chance. 
• We have just been using 25W HARD loops at 35Watts, and leaving SRM uncontrolled.  The hard loops seem fine, so I commented out what I put into the guardian for 35W hard loops on thursday night. 
• The guardian should be set up to get us to low noise at 35 Watts, the only thing we need to do by hand is engage IMC WFS DOF1P offset.  
• Travis and TJ have been adjusting phases for PIs more frequently than in the past, but they have it well under control.  
•  I got a measurement of DHARDY at 25Watts. (last screenshot)

I asked TJ to get another lock in this configuration if he can, then do the ring heater change I promised Stefan I would do.  

TITLE: 11/06 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: TJ
SHIFT SUMMARY:  Locked at NLN for the first 4.5 hours of my shift. After lockloss, have been unable to make it back to NLN, mostly due to ISS issues. 
LOG:

Robert to LVEA a couple of times.

3:26 Lockloss.  Cause unknown.

5:11 Sheila plugging DBB back in.  Robert unplugged it earlier.

Travis, Sheila

Tonight we saw more pathological behavoir in the PSL electronics.

Robert wanted to do a test of powering down the DBB, so he switched the power supply that sits on top of the DBB chassis off and unplaggued the DIN connector from the back.  After this, engaging the ISS second loop caused the diffracted power to drop from almost 5% to less than 0.5%, which caused locklosses as we tried to increase power. 

We tried to let the offset adjustment servo (30932) run for a while, but this didn't help. 

We plugged back in the DBB so we could get back to locking, but doing so tripped the PSL external shutter. 

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.

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.

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.