TITLE: 11/19 Owl Shift: 08:00-16:00 UTC (00:00-08:00 PST), all times posted in UTC

STATE of H1: Initial Alignment

OUTGOING OPERATOR: Cheryl

QUICK SUMMARY: Cheryl reported issue DRMI ASC (PRC and SRC ran away?) so she was doing an initial alignemt. Since the alignment hasn't been changed I wanted to see for myself so I let ISC_LOCK take control and try again (making measurement for Sheila in the process). X arm green couldn't get to 0.9 so I moved ITMX and TMSX (knowing it's probably be terrible for the michelson). PRMI indeed looked terrible so I went back to Initial alignment to take care of the corner station optics. I just finished the green arms. Beatnote was terrible for so I moved PR3.

State of H1: locking DRMI but cannot engage DRMI ASC

Commissioners: Sheila, Terra, Daniel

Activities:

• locked early on, work by commissioners
• odd lock loss - see Sheila's alog
• relocked - lockloss due to commissioning
• locked DRMI multiple times, and multiple times could not survive DRMI ASC

Notes from Sheila:

• alignment was good in the 4 hour lock, and did relock, but earlier she mentioned that alignment might need help to relock, since she manually moved optics in the lock
• would like a2l run after 1-1.5 hours in lock
• in alog 31628 she asked for a measurement on lock loss, but when she left we both thought H1 would relock and go back to NLN easliy, so I believe she was wanting this measurement with the alignment we had in the last NLN lock
• any trouble with PR3_REFL_WFS breaking lock, skip it by going to Manual in Noise Tunings and go straight to NLN

Notes from Terra:

• zero PI modes in DC Readout, then damp later if they ring up

My damping of PIs:

• Mode 26:
• 1:24 gain = 7000
• 1:50 gain = 0
• 2:04 gain = 7000
• 2:15 gain = 0
• 2:36:30 gain = 7000
• 2:42:30 gain = 0
• 3:15:58 gain = 7000
• 3:28:02 gain = 0
• 4:32:00 gain = 7000
• 4:42:20 gain = 0
• 4:47:25 gain = 7000

Cheryl and I just had a confusing lockloss 2016-11-16 4:47:04, where I closed the beam diverters and as soon as I did that tidal seemed to run away.  We've tripple checked and no ASC was controlled by out of vacuum sensors.  

It seems like tidal did not come on at all durring this lock.  Also, you can see that a few hours into the 30 hour lock stretch the tidal became noisier.  

Tidal seems to be stuck  bleeding off, although the outputs have gone to zero, the request was issued to turn tidal on, but it is not on.  

The red triggers for tidal which we readjusted yesterday (31753) seem fine, they were triggered on the whole time. 

Was it just a coincidence that I closed the beam diverters at the moment when we ran out of range because we had not had tidal on for the whole lock stretch?  Why wasn't tidal on?

We've been struggling to switch from POP X to REFL WFS, probably because with our low recycling gain we are near the point where the REFL WFS have a sign flip for PR3.  However, we know that we get bad scattered light coupling to DARM from ISCT1 if we leave the beam diverters open, so it would be good to switch to REFL WFS. TOday and last night we tried improving the recycling gain by changing the spot position on PR3, which makes the broad lump of noise from 200-1kHz come back.  We also have reduced range which is probably because the SRCL coupling changes and we need to update the feedforward.  I am hoping that we can see that the interferometer is stable in this configuration, and that we can get the range back to 75Mpc by retuning the FF if we get a long lock to measure the transfer function.  In that case we will have to decide if we are more bothered by jitter or the scattered light, or try jitter subtraction or TCS to help with the jitter. 

One wrinkle in this is that the REFL WFS centering for yaw seems to go unstable, probably because it is cross coupled with some of our ASC loops.  If you are an optimist you will believe this was actually the problem with the REFL WFS not the changing matrix, and that we can just go back to our low jiter/ low recycling gain alignment.  

Move PR3 spot position:

Yesterday we tried moving our spot position on PR3 as a way of increasing the recycling gain.  We have been operating at an alignment that gives us a recycling gain of around 30.5, but minimizes the broad jitter lump in DARM.  We are able to get a modest increase in recycing gain (to almost 30.7) by moving the PR3 spot in yaw, without causing any extra noise in DARM (this is the test that Nutsinee did last night). However, to get the best recycling gain (almost 31.6 ish) we need to also move pitch back in the direction that makes the broad jitter lump appear again.  The first attachment shows the range and recycling gain over the course of the 30 hour lock we just had, you can see that the range clearly drops when the recycling gain increases. 

The drop in range however is not due to the jitter peaks, but due to the very small change in the noise from 30-200Hz. The second attachment is a comparision of the spectra in these 2 configurations, in the good recycling gain example we had not retuned a2l which makes the noise below 25Hz bad in the blue trace. The third attachement shows the cumulative range difference, you can see what frequencies are responsible for the drop in range. The third attachment shows that in the higher recyclcing gain state we had more SRCL coherence at these frequencies, so it might be possible to recover the range with the higher recycling gain by retuning SRCL feedforward. 

The offsets to use in PRC1 to get to the recycling gain of 32 are 0.2 for pit and -0.109 for yaw. I have put these into the POP A offsets, old values were 0.44 for yaw, nothing for pit, new values are  0.2 for pit, 0.331 for yaw.  Cheryl was able to lock the interferometer this way without any updating of the inital alignment references. 

PR3 on REFL WFS:

This afternoon I measured the refl WFS sensing for PR3 in some uncalibrated units:  

I used the signals for which there is a signal with the same sign in both measurements and not factors of 10 gain changes. 

I used an input matrix of 0.53 for REFL A 9I, 0.04 for REFLB9I and -0.092 for REFL B45I.  For yaw I switched it over using an input matrix of just refl B, 0.066 REFLB9I and -0.2 REFLB45I.  This gives us a ugf about a factor of 4 below what we use for POPX.  We have an instability at around 1.88 Hz when we sitch yaw over to REFL WFS with a higher bandwidth, I think it comes from the DC1_Y centering loop.  

DC1Y centering instability:

Last week Daniel and I worked on the refl centering loops with the interferometer off, (31382), the settings haven't changed but when I measured DC1Y with the full interferometer locked, something has changed for the worse as shown in the 5th attached screenshot.  One gues is that this is because the centering loops are cross coupled with our other ASC loops.

We can try to fix this by increasing the gain, for now I have removed the cut off filter from DC1Y, which only helps a little.  Having this off causes RM2 to saturate when we are locked at DC readout (the talker announces this as OM).  I also added a notch to PR2Y which only gets engaged when we switch to the REFL WFS, it would not be OK if we had a higher bandwidith.  This isn't a very good solution.  

The guardian is edited to put in the new matrix and engage the notch for now in PR3_REFL_WFS. If this is not stable you can just go back to skipping PR3_REFL_WFS and CLOSE_BEAM_DIVERTERS

Operator Request:  If the interferometer unlocks, could whomever is on shift measure the DC1Y centering loop?  

• First you will have to align PRM, and misalign ITMS and ETMS.  
• Then engage the DC centering loops by opening the ASC overview, and opening the link to DC centering on the blue button in the center of the screen.  Turn on the 4 inputs for DC1 P and Y and DC2 P and Y. 
• Download the template attached to this alog and hit run.  
• Save this.  If this works, it might also be helpful to run in some other configurations like DRMI or at DC readout before powering up. 

started at 4:21:51UTC

ended at 4:35:00UTC

Not sure if this was looked at earlier in the day, but CP4 has been in alarm off and on since 7:44AM PT.

Plot attached shows MX, CP5, not in alarm, on the left, and MY, CP4, going in and out of alarm on the right.

Second attachment is the alarm log.

The DBB shutter was opened to allow for more jitter measurements. The measurements are:

1. File B: In lock for a long time (>24h), we see jitter coherence with DARM around 500 Hz as high as 0.35.
2. File A: Moving to an alignment with higher power recycling gain (32 instead of 30.5) increased the coherence as high as 0.5.
3. File C: At the beginning of the next lock the coherence was around 0.15.
4. File D: Moving to the alignment with higher recycling gain increased this coherence to 0.35.

There is clear correlation where the alignment with higher recycling gain has a higher jitter coupling. There also seems to be some thermal effect where the interferometer initially has a lower coupling.

The calibration of the DBB QPD jitter is just the inverse of the sum divided by 60 to account for the PMC transmission. The jitter measured by the IMC WFS DC was scaled by 1/3 to match the measurement when the IMC was unlocked.

Looking at the comparison of jitter during O1 and now (alog 30581) as measured by the IMC WFS DC, one might expect that the HPO jitter can explain all excess low frequency jitter below 70 Hz. This seems to work fine for pitch, but not very well for yaw. The coherence between WFS B DC yaw with the DBB QPD channels isn't higher than 0.3.

The effect of the alignment change on the DARM jitter coupling makes one wonder, if there isn't a Gouy phase conspiracy, where the coupling of the periscope peak is mostly independent. The Gouy phase difference between the periscope peak and the HPO jitter seems to be roughly 120°, if we believe the WFS DC readbacks. MC_F and REFL_SERVO_CTRL mainly see jitter peaks after the PMC. The auxiliary length dofs don't see much more than the periscope peak itself. Only DARM seems to be sensitive to the HPO jitter.

State of H1: in DC readout, measured a2l, NLN, measured a2l

Activities:

• 00:14 - Gerardo returned from EX
• 00:30-0035 - a2l, but file needed an update, not completed
• 00:36-00:43 - a2l in DC readout start to finish, going to NLN
• 00:50 - set PI modes 3 and 26 gains to zero, after reaching NLN
• 00:54-01:01 - a2l in NLN, lower gains

4:10pm local

Took 2 min. to overfill from control room by increasing LLCV from 16% to 50%. I raised nominal to 17% for weekend.

Jim is doing some testing/studies on the tilt ISO dofs.  Please let these 10 diffs remain for now.  Be mindful of other changes of course but none should come up.

Attached are the ISC relief to HEPI; units are nanometers.  Finally, a complete tide cycle!  If only we had the iLigo predictor running.

Looks like we had plenty of head room on HEPI but it is interesting that the Yarm never went negative like the Xarm.  Not sure that means much at a day plus stretch.  Maybe some initial grab residual.  I expect it would start behaving after a few days lock

TITLE: 11/19 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Cheryl
SHIFT SUMMARY: 26.6hr Lock ended 30min before the end of my shift. While it was locked we ran a2L a few times and Commissioners did some work when they could.
LOG:

• 16:09 Out of Observing to run a2L
• 16:19 Observing
• 17:09 Jeff changing high frequency roa,ing cal line
• 18:56 Out of Observing so Sheila can move PR3
• 20:22 Observing
• 21:02 Out of Observing
• 22:03 G-type test event
• 23:30 Lockloss after 26.5hrs. HAM6 tripped
• 23:32 Gerardo to EY to change IP address of pump

WP 6328

This morning we turned ON filaments of RGAs at EY and corner......from the control room! Gerardo will set the IP address for EX to complete WP. 

I was disappointed to find that we cannot connect to multiple devices at one time to monitor multiple scans in RGA software. Contacted vendor about this. Analog signal monitoring via CDS will help (ECR 1600307).

First attachment is the ASC changes accepted.  All the ones accepted are gains that have been rounded off to 4 places rather than 10.  I did miss one matrix value (circled) but I've corrected that in the file directly and reloaded that to the FE.  The 23 remaining differences are filters, offsets and matrix changes requiring more scrutiny.

For the LSC, the same applies.  There is one offset difference remaining--see attached.