The attached dtt screenshot shows the coherences of MICH and SRCL feedforward with the DCPD sum.

Note in particular the high coherence with SRCL FF between 2 and 5 Hz. In fact, most of the rms SRCL FF drive comes from below 5 Hz.

The attached dataviewer screenshot shows timeseries trends of the DCPD sum (below) and the FF signals (above) during lock acquisition. One can see that turning on the feedforward appears to increase the DCPD sum rms.

Also attached are TFs of the foton filters used for the feedforward.

O-1 Days 22-28

model restarts logged for Thu 15/Oct/2015

No restarts reported

model restarts logged for Wed 14/Oct/2015

No restarts reported

model restarts logged for Tue 13/Oct/2015
2015_10_13 08:03 h1calex
2015_10_13 08:05 h1broadcast0
2015_10_13 08:05 h1dc0
2015_10_13 08:05 h1nds0
2015_10_13 08:05 h1nds1
2015_10_13 08:05 h1tw0
2015_10_13 08:05 h1tw1

Maintenance: new calex model with associated DAQ restart

model restarts logged for Mon 12/Oct/2015

No restarts reported

model restarts logged for Sun 11/Oct/2015

No restarts reported

model restarts logged for Sat 10/Oct/2015

No restarts reported

model restarts logged for Fri 09/Oct/2015

No restarts reported

TITLE: "10/16 [OWL Shift]: 07:00-15:00UTC (00:00-08:00 PDT), all times posted in UTC"

STATE Of H1: Observing at ~80 Mpc for the past 2 hours.

SUPPORT: Kiwamu, Sheila

SHIFT SUMMARY: Difficulty locking more than half of the shift. First I ran into Guardian issue not turning on the gains for INP1 and PRC1. Corey probably ran the a2l script and turned on the right gains by accident when he reverted the SDF differences (after a2l script failed) so we weren't aware of this happening. After couple of times turning the gains on by hand and eventually reloaded Guardian code as Kiwamu suggested, I ran into another problem and kept losing lock at ENGAGE_ASC_PART3. During phone calls with Sheila and Kiwamu we though it was an issue with the ASC. Kiwamu came over and after noticing a huge drop in RF90 prior to a lockloss he suggested I run an initial alignment. Turned out there were 2urad offset in TMSY. I didn't have any trouble locking arms green and DRMI so I didn't suspect a bad alignment (although I kept having trouble finding IR. Maybe that could have been a red flag?).

After the initial alignment we lost lock at Switch to QPDS once but everything went smoothly afterward. We got to NOMINAL_LOW_NOISE, ran the a2l script (had no trouble running it on my account), and finally Observing for the first time in almost 7 hours at 12:56 UTC.

Tonight I learned how 2 urad can make life miserable. My world will never be the same again.....

INCOMING OPERATOR: Jim

ACTIVITY LOG:

See Shift Summary.

Back Observing at 12:56:10 UTC after running the a2l script. It went fine for me (I ran it on my account).

POP_A_LF and AS_AIR RF90 aren't looking good. I while I was wondering what's going on I noticed differences in SDF and ASC INP and PRC1 pitch and yaw gains were 0 (setpoint=1). Was this a leftover from a2l script error? I reverted it, accepted the changes and hoped for the best. No luck though. IFO just lost lock at NOMINAL LOW NOISE. CSOFT was running away.

Seeing how a2l script left us with problems tonight I WILL NOT RUN IT until I know that it's safe to run.

TITLE:  10/15 EVE Shift:  23:00-07:00UTC (16:00-00:00PDT), all times posted in UTC     

STATE of H1:  Currently in Lock Acquisition

Incoming Operator:  Nutsinee

Support:  Jenne on phone about A2L script

Quick Summary:  Two mysterious locklosses toward the end of the shift (see specific entries).

Shift Activities:

• ETMy Saturation:  00:13, 2:24, 2:35, 5:25
• 0:20-25 In PSL Diode Room to top off Crystal Chiller.
• 1:27 GRB Alarm
• 4:10 H1 Lockloss:  ¿Mystery ?
• 5:10 Back to Observation
• 6:15 Lockloss
• Handing over to Nutsinee

H1 dropped out at 6:15 for unknown reasons (seismic quiet & Strip Tools looked fine).

Attempt #1:  Guardian stuck at Check IR.  So, moved ALS PLL DIFF OFFSET slider until Yarm power started flashing.  Then Guardian continued.  Engage ASC Part3 seems to be a bit of a time sink here (it took about 6min for the control signals to take over).  Had a lockloss during the Reduce Modulation Depth step.

Attempt #2:  Nutsinee was in early for her shift so I handed over the ifo to her.  She mentioned watching Jenne run the A2L script, so she will give it a try during her shift.

I also asked Nutsinee to take a look at the previous locklosses since she has experience running lockloss tools.

H1 had a lockloss at 4:10utc where there was no obvious culprit (nothing seismic, but I forgot to look at strip tools to see anything obvious).

• 1st Attempt:  DRMI locked on the wrong mode and BS pitch was tweaked to lock DRMI.  Lockloss at "Switch to QPDs".
• 2nd Attempt:  DRMI locked within 5min, and ultimately reached Nominal Low Noise after a cumulative 22min.  

Commissioning Mode for A2L:  Once in Nominal Low Noise, ran the A2L script, but unfortunately it had errors, and left the SDF with diffs (after getting some consulting with Jenne able to Revert the SDF).  So spent about another 22min running & troubleshooting A2L recovery.  Will send Jenne errors in A2L script session.

Then went to Observation Mode at 5:10utc.

• Received a GRB Alarm at 1:26:56.
• It is a real alarm.  This is a GRB registered by the Swift sattelite & is listed as E192933.  
• We will have a Stand Down Time from 1:27 - 2:27 UTC
• LLO Operator (Brian) contacted me via TeamSpeak to confirm the alarm (so it sounds like they have GraceDB notifications back...they had been down the last few days).

J. Kissel, K. Izumi, D. Tuyenbayev

As expected from preliminary analysis of the actuation strength change (see LHO aLOG 22558), DARM Open Loop Gain TFs and PCAL to CAL-CS transfer functions reveal minimal change in the calibration of the instrument. For these measurements, all we have changed in the CAL-CS model is switching the two signs in the ESD stage, which in turn cancel each other. As such, the only change should be the change in discrepancy between the canonical model and the actual current strength of the TS / L3 / ESD stage. Again, this change was small (sub ~10%, 5 [deg]), and has been well-tracked by calibration lines, so we will continue forward with focusing our efforts on determining how to apply the time-dependent corrections.

Attached are screenshots of the raw results. Darkhan's working on the more formal results. Stay tuned!

The after-bias-flip results live here:
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O1/H1/Measurements/DARMOLGTFs/
2015-10-15_H1_DARM_OLGTF_7to1200Hz_AfterBiasFlip.xml

/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O1/H1/Measurements/PCAL/
2015-10-15_PCALY2DARMTF_7to1200Hz_AfterBiasFlip.xml

The first attached plot (H1L1DARMresidual.pdf) shows the residual DARM spectrum for H1 and L1, from a recent coincident lock stretch (9-10-2015, starting 16:15:00 UTC). I used the CAL-DELTAL_RESIDUAL channels, and undid the digital whitening to get the channels calibrated in meters at all frequencies. The residual  and external DARM rms values are:

The 'external DARM' is the open loop DARM level (or DARM correction signal), integrated down to 0.05 Hz. The second attached plot (H1L1extDARMcomparison.pdf) shows the external DARM spectra; the higher rms for H1 is mainly due to a higher microseism.

Some things to note:

• L1's residual DARM is 6x smaller than H1, due to more suppression in the 2-5 Hz region. As the 2nd plot shows, there is more DARM excitation in this region on H1 than L1.
• The DARM DC offset for both interferometers is 10 pm, so the residual DARM represents a relative fluctuation of the detected power or photocurrent of 0.1% for L1, 0.6% for H1.
• The violin mode fundamentals are much lower in H1 than L1 - by around 3 orders of magnitude! This is because for H1 the violin mode active damping is left ON during low noise mode, whereas for L1 I believe it is turned OFF. However, this also means that the H1 front end calibration is not accounting for these damping paths.

The 3rd attached plot (H1L1DARMcomparison.pdf) shows the two calibrated DARM spectra (external/open loop) in the band from 20-100 Hz. This plot shows that H1 and L1 are very similar in this band where the noise is unexplained. One suspect for the unexplained noise could be some non-linearity or upconversion in the photodetection. However, since the residual rms fluctuations are 6x higher on H1 than L1, and yet their noise spectra are almost indentical in the 20-100 Hz band, this seems to be ruled out - or at least not supported by this look at the data. More direct tests could (and should) be done, by e.g. changing the DARM DC offset, or intentionally increasing the residual DARM to see if there is an effect in the excess noise band.

As Jim had almost relocked the IFO, we had an epics freeze in the gaurdian state RESONANCE.  ISC_LOCK had an epics connection error.

What is the right thing for the operator to do in this situation?

Are these epics freezes becoming more frequent again?

screenshot attached.