20:47 at Robert's request, I have closed reamining beam diverters except for POP. 

21:06 Anamaria is at EX. BRS has been turned off.

Dr Effler reported to me that she has reverted the -.2 Pit offset that Sheila set recently back to +.2. This resulted in a 400µrad shift in IM4.

I have created a new troubleshooting guide for H1, in preparation for O2.  It is available at G1602280 (too big for alog, so won't add it here also).  Attached here is the overview page that in the document has clickable links to each section.

My vision for this is that it is a go-to document when things aren't working as smoothly as they should be.  I try to provide specific instructions on what to do, but also enough information that Detector Engineers, Operators and anyone else can start looking deeper and debug problems on their own.  Text throughout the guide is clickable, so that you can jump to the section that you need. 

I encourage others to add to the document, or point me to well-written wiki pages / alogs with detailed instructions so that I can add to the document.  For example, both the PI and violin mode damping "instructions" in the guide actually just point you to the very well written wiki pages on those topics.  There are 19 sections so far, but I'm sure that I've missed some, and that others will come up, so please let me know or modify the document yourself if you find something!

As of now, H1:LSC-[XY]_EXTRA_AI_[123]_OUT_DQ are in the science frame at 2k, but nobody remembers what they are.

I went to the end stations and found that H1:LSC-X_EXTRA_AI_1 and H1:LSC-X_EXTRA_AI_2 were connected to green REFL A FET demodulator I and Q monitor. Same thing for Y.

Since we haven't looked at these for a long long time, I removed these cables from the DSUB breakout. There's still one cable attached to DSUB breakout which is for Ethercat-frontend interface, but this is not EXTRA_AI channel.

For the moment the output of these channels are turned off to compress the data size. Next Tuesday these are removed from the frame.

We'll also remove jitterFF signal from the frame as we're not using that feature.

Krishna

Summary:

1. Closing the valve for the vacuum can of cBRS makes it very sensitive to pressure through an unknown mechanism. With the valve open, pressure coupling is not visible.

2. cBRS sees signficant ground tilts at wind speeds of ~20 mph, which are coherent with ITMX Stage 1 rY sensor but not very coherent with ITMY ground seismometer. As we suspected, ITMX sees larger ground tilts than the ITMY seismometer. For some peculiar reason, the ITMY seismometer seems to be in a null zone for tilt. This is the reason it works well for sensor correction for the corner.

Details:

As discussed in my SWG log last week, cBRS sees excess ground tilts below ~50 mHz which are not expected given it's 'd' value. It's 'd' value can be inferred from it's translation coupling visible as the height of the microseism peak along x-direction.

1. I wondered if there was some other effect that was causing the increase in the cBRS signal below ~50 mHz. In an effort to understand this, I closed the valve to the vacuum can. I had hoped to supress air pressure/density changes in the beam-path which would give a phase shift signal through index of refraction effect. To my surprise, the pressure sensitivity got signficiantly worse as seen in the first attached file - PZTControl_ValveClosed.png. The second file cBRS_PressCorr_ValveClosed.pdf shows the time trace of the scaled pressure, angle and temperature signal with some scaling. The pressure correlation is quite clear.

Two possible ways it could have gotten worse are - a) mechanical effects, such as pressure change producing stress on the vacuum can base producing tilt etc and b) stress on the vacuum can base affecting the fiber feedthrough.

Since this was clearly worse than before, I reopened the valve fully.

2. The third file (cBRS_Quiet.pdf) shows data under low wind speeds. I have shown cBRS angle data, the inferred tilt from cBRS, the PEM tiltmeter (fancy bubble level) and the ITMY seismometer acceleration/g (to convert to angle). The next page shows coherence between cBRS angle and Stage 1 rY, ITMY STS-X and Stage 1 X. The coherence at the microseism is due to the translation coupling.

The last file shows the same set of data under wind-speeds of ~20 mph. Note that regardless of the cBRS transfer function, the signal above resonance is trustable and shows a large increase in tilt which is similar to what we see at the end-stations. The PEM tiltmeter and the ITMY STS see an increase as well but they are smaller than the cBRS tilt in the 80-100 mHz region by a factor fo ~3. The coherence plot also shows signficiant broadband coherence between cBRS and Stage 1 rY (except at the microseism, likely due to an incorrect scale factor for the T240). The shape of the inferred tilt looks odd below ~50 mHz and indicates an incorrect transfer function. It looks like there is an additional systematic effect that I'm missing (I think it is not temperature or pressure so far). I'll continue to investigate.

The high frequency 5001.3 Hz "roaming" calibration line has been turned back on at 18:54 Nov 23 2016 UTC.

18:45UTC

SEI - Working on getting seismon running. Everything else is ok at this time.

SUS - didn't get charge measurement on Tue. Will try to get this week. FIlter fix, fixed the ITMY issue. SDF updated. (re: causing 20 minute ringdown after locklosses)

CDS electronics - reverted NDS2 software client back to previous version, agaon. Should hold us through 02.

PSL - nothing

VAC - wants to do BSC experiment in corner station. Maybe start bake of PT180

CDS - ane installed and seems to be functional, again. PEM work in vault.

Hardware detection test was done last night successfully. things that did not work: people could not log onto LDAS.LIGO.WA mostly successful mat do it again before '02. In the future, in the case of an alert, immediately stop any injections

Keita wil be investigating unused ADC channels at End Stations

REMINDER -  to be cautious around siesmometers when doing maintenance work. (i.e. infrasound mic incident)

18:16 UTC lockloss at CLOSE_BEAM_DIVERTERS. This also tripped HAM 6 ISI. Going to stop at NOISE_TUNINGS and perhaps move manually to NLN?

Here's the transition summary a little late.

Frequently I find that SRC will not lock properly. I then misalign SRM and look at the spot centering on te ASC_QPD to check the alignment of SR2. Usually I find that it's been driven off diagonally in one direction or the other making it difficult for the loops to align and converge SRM into the cavity. After re-centering I will re-align SRM and re-request SRC_ALIGN and it should lock and converge properly. Maybe some hand alignment will be necessary.

Not sure why sequence stuck at FIND_IR. X-arm power not reaching maximum potential. I re-centered as per oplevs because I noticed that after the las op lev align the ITM and ETM seemed a bit off-axis in it's alignment. I got the power back to acceptable range and tweaked TMS a µrad or two and letting WFS 'cook' for a while. Curious as to why there was 'FIND_IR" levels of IR in X arm while doing ALS align? 

TITLE: 11/23 Owl Shift: 08:00-16:00 UTC (00:00-08:00 PST), all times posted in UTC

STATE of H1: Lock Acquisition

INCOMING OPERATOR: Ed

SHIFT SUMMARY: First half of the shift Sheila was moving around optics and eventually gained 10 Mpc. Then we took H1 to Observe to be ready for the scheduled injections. Sheila took out SDF from the intention bit condition so SDF differences will not prevent us from going to Observe. INJ_TRANS Guardian had some issues. Whatever the issue was, hitting INIT seems to have fixed it.

LOG:

11:59 Went to Observe to get ready for the scheduled hardware injection. a2l was still running the last couple of lines.

13:35 Gamma Ray burst. Since it's still an Engineering Run I assume the scheduled injection takes priority. Ignored the GRB.

15:18 Lockloss

It looks like we had another incident of the POP90 power changing, (circled in the striptool screenshot) similar to what Stefan described in 31181.  Is this still a problem with the demod as RIchard found the first time?  If its only an intermittent problem with the POPAIR 90 demod, we probably don't need to worry about fixing it before O2 because that is jiust a monitor and won't be used if we are able to close the beam diverters for the run.  

Detchar question: 

Did we have RF45 glitches around these times?  The times are roughly 16:26, 16:30, 16:36 and 16:42 Nov 19th local time, which is 0:26, 0:30, ect Nov 20th UTC time.