19:26UTC - 12:26PT, truck at receiving

19:37:35UTC - Commissioning , Praxair on site

Praxair takes about 2.5 hours, so expect to be in Commissioning until about 22:15UTC.

There is a second Praxair truck expected today as well.

19:44UTC - Richard, Filiberto, Mid-Y

19:45:55UTC - engaged FM2 on DHARD_Y, Sheila's filter

- heard the rumbling of the truck in the CR, and saw the range drop to 55Mpc just before engaging the filter

- apparently the truck had to turn around and go to the Y arm, which is the rumbling I heard

TITLE: IFO returns to Observe after multiple large earthquakes over the last 4 hours.

ASSISTANCE: Hugh (HAM5 SEI clearing all Guardian issues), Sheila (bounce-roll mode damping)

TIMELINE: 

15:00UTC - start of shift, high ground motion

- SYS_DIAG telling me ISS defracted power is too high - I reduce the slider.  Defracted power was 12 and went to 9.

15:47:12UTC - ground motion just coming down enough to relock, first DRMI lock since the earthquake in Canada

16:09:36UTC - IFO made it to Bounce Violin Mode Damping

16:19:37UTC - IFO unlocked

- A couple more DRIM locks that didn't survive.

- Four more 5-6 magnitude earthquakes come in and prevent locking.

18:04:31UTC - IFO ready to lock, and this starts the locking sequence that resulted in the IFO going to Low Noise

- Longer than usual time from ready to Low Noise, and one reason was that the roll mode on ITMY was about 4, so with Sheila's help I started the damping of the roll mode manually, and waiting for it to improved  = 20 minutes

18:55:04UTC - IFO in Low Noise

18:58:57UTC - IFO in Observe

All buildings are beginning to respond to the lower outdoor temperatures so Bubba and I have turned on heaters in both end stations and the LVEA.

One stage of HC5 is now on in the LVEA. This will impact the input chambers the most. The response appears to be ~0.5 F.

The End stations have variac control so these have been incremented from 4ma(off) up 8.5ma

TIME: 16:39UTC, 9:39PT

STATE OF THE IFO: Unlocked

EXPLANATION:  The IFO did lock and made it past ENGAGE_ASC_PART3, but then another earthquake arrived, and broke the lock, and ground motion is high.

Video0's striptools have been modified, and now they have a red background, due to the channels DHARD_Y and DHARD_P.

When making a change to a screen, it's important to test it in all situations.  Maybe this addition worked quite well during our long lock, but right now with earthquakes and relocking, the change to the striptools have rendered them unusable.

FOM image attached.

Following Sheila's entry (alog 21708), I've tried to figure out which locklosses where due to Earthquakes during the week of Sep 10th (ER8).

Out of the 22 locklosses seen this week, I've counted 6 locklosses due to EQs. Sheila counted 9, I'll double check my conclusions with her.

The ground velocities represent the maximum amplitude predicted by the Seismon software.  These predictions could be inaccurate by a few percents.

Six examples is not enough to do some accurate statistics, but the behavior observed during ER8 doesn't contradict the conclusions drawn from ER7 (see DCC T1500230). My conclusions were:

• Ground motion < 0.6microns/s: very unlikely to trip SEI or loose lock
• 0.6 < Ground motion < 8 microns/s: very unlikely to trip SEI but will probably loose lock
• 8 microns/s < Ground motion: would propbably trip SEI and loose lock

Note: among the 16 remaining locklosses, some of them are due to a high ground motion, but EQ is not the cause (wind? human activity?).

TITLE:  9/24 OWL Shift:  7:00-15:00UTC (00:00-8:00PDT), all times posted in UTC

12:35 H1 Lockloss (nothing obvious:  seismic quiet, and all the H1 strip tools showed nothing obvious before lockloss)

During Lock Acquisition, during 2nd locking attempt, had issues with ALS XARM:

• ALS_XARM Node, there was a Guardian FAULT:  PLL, PDH
  • Symptoms:  Xarm was flashing through all kinds of modes, & guardian was in FAULT state
  • On the PLL medm, the fiber lock temperature controls error signal was in the "Beat Note Error" state (vs "PZT Frequency").  Had no idea how to fix/clear fault, but after a while it appeared to clear up on its own & go to PZT Frequency.
• Waited for DRMI acquisition about 12-15min and then went through Sheila's PRMI procedure:

1) You can either misalign SRM using the SUS_SRM guardian, or use a new state in ALIGN_IFO called SET_SUS_FOR_PRMI_W_ALS. 

2) Request OFFLOAD_PRMI from the DRMI guardian.

• Was in the PRMI_LOCK_WAIT state for a long time (order of 15min?).  How long should we wait for PRMI to lock??

3) Once PRMI locks adjust PRM and BS alignment until you get about 80 counts on POP90 and 50 counts on POP18.  

• PRM finally locked!  PRM was moved the most, a little BS & PR2

4)Realign SRM by undoing whatever change you made in step 1.

5) Request DRMI_1F_OFFFLOADED from the ISC_DRMI guardian.

Waited for DRMI to lock again.  Several times I had a Verbal Alarm which sounded like "Slip Mode"?  What do we do about this?  It looked ugly on AS-AIR video.  Had "Slip Mode" alarms a few times while waiting for DRMI, and then the Vancouver earthquake arrived!

After recovering ISIs and ETMy, took ISC_LOCK to LOCKING_ALS, but haven't made it there yet (the guardian log keeps saying "Waiting for arms to settle").  The 0.03-0.1Hz seismic band was ramping down, but flattened out at 0.3um/s (which is over an order of magnitude from normal quiet levels).  Perhaps we should wait for this to come down to normal levels.

At 13:54 Verbal Alarm posted Earthquake.

Looks like Magnitude 5.5 from Vancouver Island at 13:49.  (Terramon did not alert us to this one.)  0.03-0.1hz seismic has increased 3 orders of magnitude (!) and 0.1-0.3Hz seismic has increased 2 orders of magnitude.

ETMy & all BSC ISIs have Watchdogs have tripped.

H1 had a ~46Hr lock that ended toward the end of Jim's shift.  He noted DRMI was looking pretty ugly.  I waited DRMI a little, but eventually gave Sheila's new PRMI procedure a try, but POP18 & POP90 remained at a flat zero and PRMI never locked.  So went through the Initial Alignment procedure (I went slow & took notes since this is something we do rarely.).  Alignment was and getting to NOMINAL_LOW_NOISE were straightforward.

• H1 was down for ~2hrs (6:30 - 8:34).
• 1hr was alignment (PRMI & Initial), and 1hr was locking
• H1 currently in Observation at ~75Mpc

Reason for Lockloss?

I saw nothing obvious from seismic signals when I walked in, everything quiet!  Jim mentioned ASAir/OMC video spots took an odd move prior to lockloss.  H1 was trending down over 6hrs before the lockloss, and Jim mentioned this could be the RF45 issue which has been coming up.

Initial Alignment Notes:

• ALS locking, no issues
  • Comm beatnote ~4.7dBm
• video0 was super slow!  So, it was slow to watch control signals settle (video0 was rebooted after getting to Observation Mode)

TITLE:  9/24 OWL Shift:  7:00-15:00UTC (00:00-8:00PDT), all times posted in UTC

STATE OF H1:   H1 in lock acquisition after ~45hr lock.

OUTGOING OPERATOR:  Jim W. 

SUPPORT:  None

QUICK SUMMARY:  DRMI looked ugly.  Tried Sheila's new procedure for PRMI, but POP90 & POP18 were flat at zero.  Proceeding with an Intial Alignment.

J. Kissel

I've taken new DARM open loop gain and PCALY to DARM transfer functions to validate the current calibration. During the PCALY to DARM transfer function, I take the transfer function from PCALY's RX PD (calibrated into [m] of ETMY motion) and the CAL-CS front-end's DELTAL_EXTERNAL (calibrated into DARM [m], which -- since we're driving ETMY -- is identical to [m] of ETMY motion). These two different methods agree to within 4% and 3 [deg] over the 15 [Hz] to 1.2 [kHz] band. The calibration discrepancy expands to a whopping 9% and 4 [deg] if we look a frequencies between 5 and 15 [Hz] ;-).

I think we're in great shape, boys and girls.

Details
--------------
- CAL-CS does not correct for any slow time depedence (optical gain, test mass actuation strength, etc), so any agreement you see with the current interferometer is agreement with the reference model taken on Sep 10th 2015 (LHO aLOG 21385).

- In the previous measurement, Kiwamu had to fudge the phase by ~90 [us] to get the phase to agree. Now that we've updated the cycle delay between sensing and actuation to 7 [16 kHz clock cycles] to better approximate the high-frequency frequency response of AA, AI, and the OMC DCPD signal chain, we no longer have to fudge the phase -- AND the phase between the two metrics agree. NICE.

- I've made sure to turn OFF calibration lines *during both of these measurements, but there should be ample data just before and just after with calibration lines ON, such that we can compare our results against theirs to help refine our estimates of systematic error.

- The measurements live in
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O1/H1/Measurements/DARMOLGTFs/2015-09-23_H1_DARM_OLGTF_7to1200Hz.xml
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O1/H1/Measurements/PCAL$/2015-09-23_PCALY2DARMTF_7to1200Hz.xml
and have been committed to the CalSVN. We'll process these results shortly, and perform a similar analysis as Darkhan has done in yesterday's aLOG 21827.

L1 went out of lock. At H1 we turned off the intent bit and injected some hardware injections.

The hardware injections were the same waveform that was injected on September 21. For more information about those injections see aLog entry 21759

For information about the waveform see aLog entry 21774.

tinj was not used to do the injections.The commands to do the injections were:
awgstream H1:CAL-INJ_TRANSIENT_EXC 16384 H1-HWINJ_CBC-1126257410-12.txt 0.5 -d -d >> log2.txt
awgstream H1:CAL-INJ_TRANSIENT_EXC 16384 H1-HWINJ_CBC-1126257410-12.txt 1.0 -d -d >> log2.txt
ezcawrite H1:CAL-INJ_TINJ_TYPE 1
awgstream H1:CAL-INJ_TRANSIENT_EXC 16384 H1-HWINJ_CBC-1126257410-12.txt 1.0 -d -d >> log2.txt
awgstream H1:CAL-INJ_TRANSIENT_EXC 16384 H1-HWINJ_CBC-1126257410-12.txt 1.0 -d -d >> log2.txt

To my chagrin the first two injections were labeled as burst injections.

Taken from the awgstream log the corresponding times are approximates of the injection time:

1127074640.002463000
1127074773.002417000
1127075235.002141000
1127075742.002100000

The expected SNR of the injection is ~18 without any scaling factor.

I've attached omegascans of the injections. There is no sign of the "pre-glitch" that was seen on September 21.

Folks have been complaining that the HAM5-ISI Rogue Excitation monitor is a pain. 
(see e.g. https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=21474)

It looks like the coil-voltage-readback monitor for the V2 coil is busted somewhere, and so the monitor is sitting around -500 counts all the time. 

Hugh gave me the GPS time for a recent earthquake, and in the attached plot you can see the watchdog trip from normal (state 1) to damp-down (state 2) at T+3 seconds. The coil voltages come down pretty quickly. Then the WD goes to state 4 (full trip) about 3 seconds later and the coil drive monitors (except V2) get quite small. The rogue excitation alarm goes off about 3 seconds after that, because the V2 monitor has not fallen to abs(Vmon) < +100 counts. 

The V2 monitor just sort of sits at ~-500 counts all the time. 
I'm pretty sure the V2 coil drive is working, otherwise the HAM5-ISI platform would act very poorly.
I'm guessing the problem is somewhere in the readback chain.

Note - the channels I use for this are all Epics channels, so the timing is a bit crude and the voltages are sort of jumpy. The channels are:
H1:ISI-HAM5_ERRMON_ROGUE_EXC_ALARM
H1:ISI-HAM5_CDMON_H1_V_INMON
H1:ISI-HAM5_CDMON_H2_V_INMON
H1:ISI-HAM5_CDMON_H3_V_INMON
H1:ISI-HAM5_CDMON_V1_V_INMON
H1:ISI-HAM5_CDMON_V2_V_INMON
H1:ISI-HAM5_CDMON_V3_V_INMON
H1:ISI-HAM5_WD_MON_STATE_INMON

I've also attached screenshots of the "coil drive voltage too big" calculation and the "rogue excitation alarm generation" calculation from the HAM-ISI master model