[Jenne, Vaishali]

We were checking amplitudes for measuring the ASC sensing matrix at the POP WFS, and when I made a typo and excited SRM by a factor of 10 more than I meant to, we lost lock.   Ooopsies. TJ has the IFO back on the way to NLN now.

We'd like to measure what the sensing matrix at the in-air POP WFS looks like, so that we can compare with the simulations.  The POP WFS weren't in place the last time we measured the ASC sensing matrix back when Hang was last on site.

WP 6523

Related alogs: 34046, 34703

I was asked by Terra to check whether mode 23 (32761.5 Hz ETMY) is visible also in the TRY QPD.

So I excited mode 23 today during the commissioning window --- we see the mode in the TRY signals as well.

* * * * * *

The way the mode shows up is such that segments 2 and 4 don't see the mode in a 0.1 Hz resolution FFT at all while the mode shows up in segments 1 and 3 (diagonal pair) in a differential way. Note that the excitation was done by driving the UR and LL segments of the ETMY ESD in common. The attached shows comparison of the spectra with and without the excitation.

• Brown trace: OMC signal downconverted with a 32800 Hz oscillator when no excitation was applied.
• Green trace: TRY segment 1 downconverted with a 32800 Hz oscillator when no excitation was applied.
• Blue trace: OMC signal downconverted with a 32800 Hz oscillator when excitation was applied.
• Red trace: TRY signal downconverted with a 32800 Hz oscillator when excitation was applied.

Apparently, the OMC has a better signal-to-noise ratio than the TRY QPD by a factor of 100 or so.

Also, because of the aliasing effect, the mode is split into two components after the 32800 Hz mixing operation; one at 22.5 Hz (= 32800 Hz + 32761.5Hz + 2^16 Hz) and the other at 38.5 Hz (= 32800 Hz - 32761.5 Hz). Usually the PLL for this mode is locked to the higher frequency one, 39 Hz.

Adjusted ALS fiber polarization for the X and Y arms, they were 11 and 22 respectively.

We are currently in a scheduled commissioning time, but are still locked.

The trucks still seem to be hauling something along Route 10, but not making as big of an impact as on Monday.

There was some noise reported during Jim's shift, and maybe some ~3k noise continuing into mine. Investigations continue.

Starting CP3 fill. LLCV enabled. LLCV set to manual control. LLCV set to 50% open. Fill completed in 43 seconds. LLCV set back to 16.0% open.
Starting CP4 fill. LLCV enabled. LLCV set to manual control. LLCV set to 70% open. Fill completed in 259 seconds. TC A did not register fill. LLCV set back to 43.0% open.

FRS7667. Hugh, Jim, Dave

we have tracked the daily/weekly HEPI pump controller glitches to when crond deamon runs anacron/logwatch job at 04:02 daily and 04:22 weekly on Sunday.

When the clock was fixed at EY from being 7 hours 34 minutes in the future yesterday, today's EY glitch happened at exactly 04:02 PDT (and not 20:44 PDT as it was prior).

We are investigating 1) how can a cron job cause this issue and 2) can we just turn crond off safely.

attached image shows today's EY glitch at 11:02 UTC (04:02 PDT)

I noticed this morning that the ASC P INMON FOM showed more signal than I was used to seeing. When I looked at trends for the last 4 hours, it looks like they started to ring up around 11:00 UTC, first attached pic. When I took spectra before and after, it was immediately obvious that the quad .43hz mode was higher in the after time. My second plot is before(solid) /after (dashed) spectra of the CHARD/CSOFT P inputs, but DHARD/DSOFT and MICH also see this. Looking at the quad M0 L damp ins shows a similar result, third plot, I just show ITMY(dashed before/ solid after), but all the quads look similar. Not sure what changed, but this also kind of lines up with the drop in range this morning.

TITLE: 03/22 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 67Mpc
OUTGOING OPERATOR: Jim
CURRENT ENVIRONMENT:
    Wind: 5mph Gusts, 4mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.19 μm/s
QUICK SUMMARY: On a 10.5 hour lock stretch. Environment is calm, but the ASC P seems to be a bit noisy. Jim will add more on his findings on this. Hopefully we don't have the trucks like we have the past few days.

TITLE: 03/22 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 66Mpc
INCOMING OPERATOR: TJ
SHIFT SUMMARY:
LOG:
Quiet shift, except for the ASC getting noisy starting at about 11:00 UTC. Trying to log now, but tired.

I looked to see if LHO would benefit from doing better L2A decoupling on some of the corner station suspensions, similar to Arnaud & Marie's work at LLO (LLO alog 31459, for instance). The attached PDF shows the coherences between the different PD PIT & YAW INMONs used for ASC and the M1_DRIVEALIGN_L_OUTMONs for PRM, MC2, BS and SRM, during a windy time a couple of weeks ago. I'm a little confused because PRM and MC2 seem to have a lot of coherence with a lot of PDs, but maybe folks who know the ASC system better can make sense of this. SRM shows somewhat less coherence, but more than the BS. Each page is a different PD, the top plot is coherence between each suspensions length drive and the spot pitch. The bottom plot on each page is the yaw coherence. I believe the color scheme is the same for all plots. 

Shift Summary: Ran A2L DTT check – Pitch and Yaw are both somewhat elevated. Tumbleweed baling has finished for the day. Work will continue on the X-Arm tomorrow.

Problem #1 - Started getting OMC DCPD saturations (due to Violin Mode 508.2 ring up), but lost lock before damping. Contacted Sheila and tried to give remote access.

Problem #2 – Could not give Sheila remote access due to a problem with the authentication server. Contacted Jonathan who corrected the problem (FRS 7677 aLOG #43993).

Problem #3 – There was a problem with the Foton filter files generated after last Tuesday’s maintenance window until today at 13:00, when Jim B. fixed this problem. See aLOG #43992 for description. Contacted Dave B. who rebuilt the Foton files for the SUSs and H1OMCPI. When I reloaded, the filter files the WDs for ITMX & ETMY tripped. By the time this was all squared away the violin modes had calmed down a bit.

Relocked the IFO without the ALS_DIFF problem had during the day shift. I had to dress up BS Yaw a little bit, but no other tweaks were required.

We were back to Observing in time to receive a GRB alert.

   05:06 (22:06PT) start one hour stand-down for GRB alert. 

Support - Sheila, Dave, Jonathan  

Problem #1 - Started getting OMC DCPD saturations (due to Violin Modes 508.2 ring up), but lost lock before damping. Contacted Sheila. 

 Problem #2 – Could not give Sheila remote access due to an issue with the authentication server. Contacted Jonathan who corrected the problem (FRS 7677 aLOG #43993). 

 Problem #3 – There was a problem with the Foton filter files generated after last Tuesday’s maintenance window until today at 13:00, when Jim B. fixed it. See aLOG #43992 for description. Contacted Dave B. who rebuilt the Foton files for the SUSs and H1OMCPI. When I reloaded, the filter files the WDs for ITMX & ETMY tripped. By the time this was all squared away the violin modes had calmed down a bit. 

 Relocked the IFO without the ALS_DIFF problem TJ had during the day shift. I had to dress up BS Yaw a little bit, but no other tweaks were required to reach NLN. 

 Back to Observing and fighting with PI Mode-27.  

The operator reported issues with the remote access control system.  It was repeatedly asking for his credentials.  I was able to walk him through adding a user to the system so that he could get some help brining with the IFO.  I also was granted access.

I restarted the apache instance on cdsadminctrl after reproducing the operators issue.  This appears to have solved the issue. Apache was not able to negotiate the authentication.  Cause currently unknown.  I've opened an FRS to remind me to look at it in the morning.

See FRS https://services.ligo-la.caltech.edu/FRS/show_bug.cgi?id=7677

Violin modes seem very high on DARM spectrum so I had a quick look at the damping screens. It appears that many of the filter banks (especially ETMs) have 0 input and 0 output. I also checked with the fast channels and dtt. The input seems nonzero on dtt but the output has nothing. As the result, some of the violin modes are not being damped right now. Hope it stays through the night until somebody comes in and fix this tomorrow.

J. Kissel

I've gathered our "bi-weekly" calibration suite of measurements to track the sensing function, and ensure all calibration is within reasonable uncertainty and to have corroborating evidence for a time-dependent detuning spring frequency & Q. Trends of previous data have now confirmed time dependence -- see LHO aLOG 34967.

Evan is processing the data and will add this day's suite to the data collection.

We will begin analyzing the 7.93 Hz PCAL line that's been in place since the beginning of ER10, using a method outlined in T1700106, and check the time dependence in a much more continuous fashion. My suspicion is that the SRC detuning parameters will change on the same sort of time scale as the optical gain and cavity pole frequency.

Note also, that I've grabbed a much longer data set for the broad-band injection, as requested by Shivaraj -- from 22:50:15 UTC to 22:54:20 UTC, roughly 4 minutes.

The data have been saved and committed to:
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O2/H1/Measurements/SensingFunctionTFs
    2017-03-21_H1DARM_OLGTF_4to1200Hz_25min.xml
    2017-03-21_H1_PCAL2DARMTF_4to1200Hz_8min.xml

    2017-03-06_H1_PCAL2DARMTF_BB_5to1000Hz_0p25BW_250avgs_5min.xml
The data have been exported with similar names to the same location in the repo.

For time-tracking, this suite took ~38 minutes from 2017-03-21, 22:18 - 22:56 UTC.