[Vaishali, JimW, Jenne]

During maintenance, while no one needed the IMC, we tried out our new L2A decoupling filter for MC2.  Recall that Jim found that it would be helpful in alog 35330, and we measured and fit TFs for it in alog 35397.

We found that (a) the pre-existing L2A decoupling was in fact worse than doing nothing at all, and (b) that our new filter works well. 

In the attached screenshot, the upper left corner is the Foton Bode plot of our decoupling filter.  In the other 3 DTT panels we have the coherence and transfer functions of 3 different MC2 L2A configurations. For these measurements, the IMC was unlocked, but MC2 still aligned.  The red traces in all panels are with no L2A decoupling at all.  The blue traces are with the old L2A "decoupling" gain.  That was a flat gain, and clearly was making things worse than doing nothing at all, over a pretty broad frequency range.  The green traces are with our new L2A decoupling filter on, and we win almost 20dB of isolation below a few hundred mHz.  

We have accepted the new L2A settings for MC2 in the safe and observe SDF files, so they should always be on now.   

these models' filter files were static files located in the chans/ directory. I put them into SVN control and made symbolic links from the chans/ directory to there new location under userapps.

[Jeff K, Aaron V]

I have produced new GDS filters for LHO that include new paramters (pcal correction factors and EPICS) necessary to compute SRC detuning parameters. It will also be possible to subtract the calibration lines from the strain, producing the additional channel GDS-CALIB_STRAIN_CLEAN, if we desire. The filters can be found in the calibration SVN at this location:
ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O2/GDSFilters/H1GDS_1175954418.npz

For information on GDS calculations of SRC detuning parameters, see:
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=35041  (note that we now compute Q-inverse instead of Q)
https://alog.ligo-la.caltech.edu/EVNT/index.php?callRep=11785

The filters were produced using this Matlab script in SVN revision 4537:
ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O2/H1/Scripts/TDfilters/H1_run_td_filters_1175954418.m

The parameters files used (all in revision 4537) were:
ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O2/H1/params/2017-01-24/modelparams_H1_2017-01-24.conf
ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O2/H1/params/2017-01-24/H1_TDparams_1175954418.conf
ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O2/H1/Scripts/CAL_EPICS/callineParams_20170411.m

ASD plots comparing GDS and the front-end CALCS model are attached. These agree with those on the summary pages from the same day (4/10), as expected. Also, time domain vs. frequency domain comparison plots of the filters are attached. Lastly, a time series plot of the kappas from GDS and CALCS is attached, as well as histograms. These show the expected output.

There were number of high frequency calibration lines injected using the automated Guardian scripts. These lines are injected using the Pcal at ENDX (ENDY is used for calibration purpose). The GPS time at which these lines were running are listed below:

TITLE: 04/11 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC

STATE of H1: Observing at 65Mpc

INCOMING OPERATOR: Jeff

SHIFT SUMMARY: Not much going on. PI Mode 23 rung up. I flipped the phase 180 degree and it seemed to stop ringing up. I later found an alog that operator shouldn't damp this mode. So what's the status now?

LOG:

13:56 Briefly out of Observe (accidentally). See alog35458

~13:56 UTC, I accidentally re-enabled the front end laser watchdog.

Been locked and Observing since Travis handed off to me. Not much to report.

TITLE: 04/11 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 72Mpc
INCOMING OPERATOR: Nutsinee
SHIFT SUMMARY:  A pair of locklosses, one unknown and one due to PI.  Otherwise, nothing to mention.
LOG:  See previous aLogs.

No issues coming back up.

PI mode 28 rang up and I couldn't find the right phase value fast enough.

Ran through a painless IA.  Adjusted ISS diffracted power as it was complaining that it was low.  Accepted SDF diffs in attached screenshots.  ISS refsignal was, of course, me. The other two I am not sure about.

Cause unknown.  Lock gave up at 71 hours and 10 minute old.

Wind has calmed down a bit and the range has come up some.  We just rolled over to 70 hours locked.

L1 alog #32936 describing an alignment shift of the L1 IM2 in pitch on March 27th, 2017.

TITLE: 04/11 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 51Mpc
OUTGOING OPERATOR: Patrick
CURRENT ENVIRONMENT:
    Wind: 33mph Gusts, 27mph 5min avg
    Primary useism: 0.18 μm/s
    Secondary useism: 0.33 μm/s
QUICK SUMMARY:  No issues handed off.  Lock going on 67 hours.

TITLE: 04/10 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 59Mpc
INCOMING OPERATOR: Travis
SHIFT SUMMARY: Abnormal noise in 3-10 and 10-30 Hz seismic BLRMS correlated with noise in range for a few hours before noon. Also heard an airplane at 20:08 UTC that may have correlated with noise in DARM.
LOG:

15:25 UTC Restarted video2.
16:00 UTC Karen driving car to warehouse.
16:45 UTC PI mode 23 came up coincident with large glitch in DARM. Spike in 3-10 and 10-30 Hz CS Z axis seismic BLRMS.
Chris driving green forklift? Christina at shipping and receiving?
17:14 UTC Marc and Filiberto to mid X.
18:24 UTC Marc and Filiberto back. Heading to vault.
19:53 UTC Marc and Filiberto back.
20:03 UTC Started darmBLRMS striptool and restarted range integrand on video0.
20:08 UTC Airplane heard in control room. Possible correlated noise in DARM.
20:41 UTC Gerardo to mid Y for scroll pump maintenance work. Nothing noisy.
21:43 UTC Chandra to CP3.
21:59 UTC Chandra back.
22:54 UTC Gerardo back.

Starting CP3 fill. LLCV enabled. LLCV set to manual control. LLCV set to 50% open. Fill completed in 1072 seconds. TC B did not register fill. LLCV set back to 19.0% open.
Starting CP4 fill. LLCV enabled. LLCV set to manual control. LLCV set to 70% open. Fill completed in 128 seconds. LLCV set back to 37.0% open.

J. Kissel

Gathered regular bi-weekly calibration / sensing function measurements. Preliminary results (screenshots) attached; analysis to come.

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