Lost lock sitting at NLN and damping violin modes. Had accidentally rung up spectrum around 1008 Hz and was damping it back down. Relocking.

Found the attached SDF difference at NLN. Reverting.

Sheila, Jeff, TVo

We were thinking that comparing TFs between L2 actuators and the oplev sensors on the test masses might be a good idea, however, it wasn't trivial to get a past reference of a driven TF which matches the exact status of our current damping scheme.  

So Sheila suggested that I do a passive low bandwidth, high-averaging TF comparing the NLN states of the suspension before and after the EQ.

- References are the old (2017-06-23 03:00:00) compared to the most recent lock stretch (2017-07-28 03:49:39)

Below are the graphs and .xml files for the TFs, it seems like the pitch DOFs are clearer than Yaw as far as coherence but the ITMs are pretty bad below .6 Hz so it's hard to say something too definitive about that status in the low frequency regime.  However, for the ETMs, we can see that from .1 Hz to 3Hz there hasn't been much change due to the earthquake.  

While we were down because of the HPI pump controller I moved the ESD shield box from EX to EY, so that next time we are locked we can try the shielding test at EY.  We had one more (unexplained) lockloss before I could try anything.  Done commissioning for today.

TITLE: 07/29 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Commissioning
OUTGOING OPERATOR: Jeff
CURRENT ENVIRONMENT:
    Wind: 15mph Gusts, 10mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.07 μm/s 
QUICK SUMMARY:

Skipped VIOLIN_MODE_DAMPING_1 per Sheila's request. Made it to NLN at 23:33 UTC. Sheila commissioning.

Shift Summary: While Sheila and I were damping a Violin Mode both End HEPI pump controllers failed with an OU3. Reset per procedures in aLOG #37359 and both are back on line. Sitting a LOCKING_ARMS_GREEN while Sheila dose some work on the ESDs. Sheila finished ESD work. Back to Relocking.    

Jeff B, Sheila, Jim W by phone

I came in to do some commissioning.  Jeff B was starting to work on violin 1st harmonics while I planned to some ESD measurements so we took the IFO out of observing.  Jeff B made a modest increase in the violin damping gain the moment before the IFO unlocked and both end station ISIs and HPI's tripped.

This seems to be a coincidence, not some sort of violin mode/pump controller conspiracy.  The attached plot shows EY pump pressure goes to not OK about one second before EX pump pressure goes to not OK, which was about one second before Jeff changed the gain for ETMX MODE10 (with a 10 second ramp). I am not sure if we can trust the timing of the pump controller channels relative to the front ends.

With advice from Jim W on the phone, and using instructions from 37359 we are bringing back the pump controllers.

   IFO locked at NLN and Observing for past 15.25 hours. Environmental conditions are good. Another Mag 4.6 earthquake in Eureka CA. Very sharp up and down on the signal, and no apparent disturbance to the IFO. Monitoring the Violin Modes. Several are elevated. No action taken as the IFO is locked at 55.1Mpc and both LLO and Virgo are in science mode.  

Handing Off an H1 which has been locked over 11hrs to Jeff B.  As mentioned earlier, violin harmonics are rung up, but no action taken since range appears unaffected and Glitch monitor shows no issues (also been in triple/quadruple coinicidence for much of shift).

H1 locked for almost 7.5hrs.  Violin harmonics are still rung up (1k & 1.5k are above e-15 & others lower), but H1 Glitch tool (on nuc0) & range look fine.  Since we are in the middle of L1/V1/H1 triple coincidence for the last 7.5hrs, no action being taken.

TITLE: 07/29 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 54Mpc
OUTGOING OPERATOR: Patrick
CURRENT ENVIRONMENT:
    Wind: 9mph Gusts, 7mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.06 μm/s

useism inching up. 
QUICK SUMMARY:

Bad News:  Violins:  Fundamental is low (e-18), but 1st harmonic is up to e-16 & all higher harmonics are higher than normal. 

Good News:  Rung up violins aren't affecting our range (drifting up to our post-MT-EQ 55Mpc).

TITLE: 07/28 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 52Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY:

Jim and Sheila were damping violin modes at DC_READOUT when I arrived. I damped ETMY mode 9 (1009.2 Hz) using FM4, FM5, FM7 +100 gain in YAW. This is a change but I am not confident enough to update the wiki table or guardian code. Moved on to NLN in time to be hit by a magnitude 5.1 earthquake in California but remained locked. Reverted a SDF difference for the HAM4 ISI per Jim's instructions. Sheila and Marc did work at end X. Lost lock at 01:09 UTC. Stopped at DC_READOUT_TRANSITION to damp violin modes (the fundamentals were bad again). Damped the fundamentals. Accidentally rang up the second harmonics while trying to damp them. After damping them back down to where they were before I decided to move on to NLN and observing. PI mode 28 has rung up both times in NLN. My attempts to damp it by changing the phase do not seem to have much effect, but eventually it comes down anyway.

The range is slowly improving.

There are DIAG_MAIN notifications for both PCAL X and Y RF PD being greater than 1% off.

LOG:

00:00 UTC Trying DC_READOUT -> NLN. Changed intention bit from observing to lock acquisition.
00:08 UTC Earthquake
Sheila and Marc to end X
00:50 UTC Sheila and Marc back
Sheila running measurement
~01:00 UTC Reverted HAM 4 ISI SDF difference
01:09 UTC Lock loss
01:35 UTC Stopped at DC_READOUT_TRANSITION to damp violin modes. Fundamentals are bad again.
03:44 UTC NLN
03:58 UTC Observing

Set to observing at 03:56 UTC.

Accepted H1:LSC-REFL_SERVO_IN1GAIN SDF difference (changed from 7 to 6).
Reverted other SDF differences (attached).

Lost lock at 01:09 UTC. Back to DC_READOUT. Damped first fundamental violin modes. Working on second harmonics.

Sheila, Daniel, Marc, TVo

To eliminate some possible candidates for the 10-80Hz noise, Sheila and Daniel wanted to install a shield grounding box at EX and test various configurations to see if there is any affect on DARM, which there wasn't.

This afternoon we made an attempt to transition to ETMX ESD in low noise to see what impact it would have on our noise.  We spent most of our commisioning window damping violin modes, so didn't make a lot of progress on this. 

Attached is some text which can be copied and pasted into a guardian terminal to do the transition (read comments).  We were able to transition half way to ETMX by setting the gains equal.  The red trace in the attached screenshot is the OLTF measured with equal gains on the two ETMs, the gold is a reference from before any changes.  Based on this, I think that we should use a gain of 1.5 in L3_LOCK_L to transition to ETMX (ETMY is 1.25) and preserve the UGF.  

The IFO unlocked at the end of this measurement, I am not sure why. 

M 5.1 - 74km WNW of Ferndale, California

Showed up in BLRMS around 00:08 UTC. H1 remained locked.

TITLE: 07/28 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Jim
CURRENT ENVIRONMENT:
    Wind: 10mph Gusts, 8mph 5min avg
    Primary useism: 0.16 μm/s
    Secondary useism: 0.14 μm/s 
QUICK SUMMARY:

Jim and Sheila were damping violin modes at DC_READOUT. I damped ETMY mode 9 (1009.2 Hz) using FM4, FM5, FM7 +100 gain in YAW. Sheila requested that we attempt NLN. We made it to NLN in time for ~5 mag earthquake from California. Have remained locked through it. Sheila went to end X. PI mode 28 started ringing up and my changes in phase did not seem to affect it. It seems to be slowly coming back down on its own. We are not ready to go to observing, but there are SDF differences that I do not know what to do about (see attached).