H0:VAC-EY_INSTAIR_PT499_PRESS_PSIG went into alarm.  See attached screenshot of the trend for the past 2 hours.  I'll continue to monitor this and make some calls to VAC folks if it persists.

IFO is in down as several EQs in Papua New Guinea continue to ring down.  Microseism continues to increase to the 90%ile.  Not looking to promising for interferometry this morning.

H1 was most of the way through relocking after an unrelated(?) lockloss.  IMC started losing lock during relocking attempts when I noticed a vertical line starting to appear on the BLRMS.  L1 has been down due to microseism for several hours. 

• Reported on both USGS and Terramon by the time I noticed its effects
• Magnitude 7.9 near Papua New Guinea (initially reported as an 8.0)
• First noticed on BLRMS around 11:12 UTC.  Terramon reports that R-wave arrival should have been around 11:39 UTC(3:39 PT).
• H1 was in lock acquistion at the time of arrival.  IMC having trouble locking was my first indication of an EQ.

Major alarm for PSL dust monitor 102:

0.3 um => 42000

0.5 um => 2900

Similar to last night's lockloss (aLog 32625) but without any ECAT SDF diffs.  No obvious signs of anything ringing up on the FOMs other than microseism approaching the 90%ile mark.  HAM6 ISI WD tripping was the first verbal warning.

I went out of Observing to run A2L from 8:20-8:25 UTC.  LLO was down.  Danny at LLO let me know that they were struggling with microseism and things were looking grim.

TITLE: 12/17 Owl Shift: 08:00-16:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 68.2995Mpc
OUTGOING OPERATOR: Nutsinee
CURRENT ENVIRONMENT:
    Wind: 5mph Gusts, 4mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.44 μm/s
QUICK SUMMARY:  Locked in Observing upon arrival.

 

TITLE: 12/17 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC

STATE of H1: Observing at 67.5322Mpc

INCOMING OPERATOR: Travis

SHIFT SUMMARY: Locked early into the shift. Had to adjust IM4 and BS to zero the error signals before engaging DRMI ASC (doing so also zeroed SRC error signal - so I guess it's good to touch these mirrors in order). The shift has been quiet since. Couple of gamma ray burst alarms. The first one (01:31:59) we were just at NLN but the intent bit wasn't set (it was set right after). We were Observing for the second one (03:04:33). Several TCSY flow alarms from 03:11 to 03:46. Went out to check the TCS chiller and the flow rate there was fine. Useism slowly picking up, BNS range is slowly dropping. I checked the coherence plot earlier and it looked okay so I didn't run a2l. I just checked recently and coherence is high in YAW so Travis is going to run it after LLO is down.

Anticipating bitter cold temperatures tonight, I have increased the heat output at both end stations by 1ma. 
I will continue to monitor all areas during these falling temperatures. 

Ops Shift Log:12/16/2016, Day Shift 16:00 – 00:00 (08:00 - 16:00) Time -  UTC (PT)

Activity Log:Time - UTC (PT)

3pm local

Patrick, Kyle, Dave, Chandra

Successfully filled CP3 and CP4 using automation code and executing code via cron job. We lifted leads of both TCs on CP3 to mimic faults to verfiy code aborts. We tried to increase exhaust pressure to >2 psig threshhold by closing bypass exhaust valve but due to cold exhaust pipes it never rose above 1 psig. We even cracked the bypass LLCV half turn on CP4 along with doubling LLCV % open. We'll revisit that error test.

CP3 took about 30 seconds to overfill at 50% open.

CP4 took several minutes to overfill at 70% open and 1/2 turn open on bypass LLCV. Raised nominal from 35% to 36%.

Next week we'll test alert messaging.

Reposting the log from LLO comparing the two sites' PSL vibration coupling. 

https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=30465

   IFO has been locked in Observing for the past 3.5 hours. Suppressed PI Mode-28 and dropped out of Observing from 19:06 to 19:18 to run the A2L script while LLO was out of lock.
   Conditions are OK. The wind is up to a Moderate to Fresh Breeze (13 - 24 mph), It is cold (windchill around 9F)and clear. Microseism up at the end stations but still below 0.9, CS is fine.
        

For fun I've written a script to calculate the site windchill now the wind has kicked up. It uses the NOAA formula. The script is called windchill

david.barker@zotws2: windchill
EX temp 20.1(degF) wind 09.0(mph) windchill 09.6(degF)
MX temp 19.4(degF) wind 09.0(mph) windchill 08.8(degF)
CS temp 21.2(degF) wind 08.0(mph) windchill 11.7(degF)
MY temp 19.3(degF) wind 08.0(mph) windchill 09.4(degF)
EY temp 17.8(degF) wind 08.0(mph) windchill 07.6(degF)
 
wind chill average over site 9.4 degF
 
 

   At 19:06 (11:06) took advantage of LLO being down to dropped out of Observing to run the A2L script. Back in Observing at 19:18. 

   After relocking this morning had an SDF diff for IMC-REFL_SERVO_IN1GAIN. 

Josh, Andy, David

After stumbling on the ringing phones in the LVEA in O2 (entry 32503) we sent this request, to find other times in h(t) that look like phone ringing glitches, to GravitySpy citizen scientists. Though it's dirty laundry airing this is a way to engage a network of many interested folks to find issues.  

The reply from user @EcceruElme pointed to two similar glitches in O1/ER10/O2.
One is in Livingston at 1132398529.14 (Nov 24th 11:08 UTC - link) and looks like an ER10 instance of engaging violin mode damping while in observation ready but before SDF checks were being enforced, so ok.
One is in Hanford at 1128269436.32 which is 2015-10-07 at 16:00 during a long nice science mode lock (summary page for that day). This sounds a little like a fax machine then some bangs and a human voice through a loudspeaker and some more bangs. In the hour around that time there are also some other loud bangs. We have no idea what it could be but it happened in otherwise unbroken excellent O1 data so perhaps folks on site know what it is and if it can be (or has been) turned off.

Attachments:

- Audio file of Input Optics Microphone with no filtering.
- Spectrogram of Input Optics Mic (it was also loud in BS Mic, others in LVEA but quiet in PSL room Mics) and Strain
- OmegaScan of Strain (from GravitySpy) 

Chandra lifted the lead for TE252A. Kyle put the CP4 LLCV into PID and disabled. The script to fill CP4 was run:
vacuum@vacuum1:/ligo/home/patrick.thomas/svn/scripts$ python cp4_fill.py 70 -60 3600
Starting CP4 fill. TC A error. LLCV enabled. LLCV set to manual control. LLCV set to 70% open. Fill completed in 30 seconds. LLCV set back to 35.0% open.
Chandra put back the lead for TE252A.

Chandra lifted the lead for TE202B. Kyle put the CP3 LLCV into PID and disabled. The script to fill CP3 was run:
vacuum@vacuum1:/ligo/home/patrick.thomas/svn/scripts$ python cp3_fill.py 50 -30 3600
Starting CP3 fill. TC B error. LLCV enabled. LLCV set to manual control. LLCV set to 50% open. Fill completed in 110 seconds. LLCV set back to 19.0% open.
Chandra put back the lead for TE202B.

Both scripts are in svn under /trunk/scripts in the projects repository. Revision 4023.

Looking at a few tasks on the calibration to-do list, I ended up down the rabbit hole. Sadly, it's getting late and will have to return to this tomorrow.

Investigations:

1) Working on fixing the PCAL --> CAL-CS_DELTAL_EXTERNAL calibration (see LHO alog 31994). Kiwamu's original script computed a transfer function accounting for time delays caused by the DAQ and the CAL-CS whitening filter. However, this is already taken into account in the clock cycles delay in the CAL-CS model when adding the sensing and actuation paths. Since CAL-CS corrects for the phase delay caused by AA/AI filtering--analog and digital--using the delayed actuation path, then what one really wants is to correct CAL-CS for the magnitude changes of the AA/AI filtering and any CAL-CS whitening on this channel while also correcting the PCAL_RX_PD channel for the effect of AA and that we also have not applied a filter with two poles at 1 Hz (for the free-mass response):

DELTAL_EXT   W * [Derr/C_foton + A*Dctrl*delay]
---------- = ----------------------------------
PCAL_RX_PD         m * f^2 * AA_a * AA_d

 m     DELTAL_EXT [C_real/C_foton] / [W * abs(AA_a * AA_d * uncompensatedOMCpoles)]
--- = ------------------------------------------------------------------------------
 m                PCAL_RX_PD / [f^2 * AA_a * AA_d]

Note that the correction factors applied in the numerator of the final equation are really only to be applied to the sensing side. However, the corrections are only at high frequency (low-frequency corrections are simply unity), so the numerator term is dominated by the sensing function.

Thus the calibration to be applied is thus:

   [C_real/C_foton] * [f^2 * AA_a * AA_d]
----------------------------------------------
[W * abs(AA_a * AA_d * uncompensatedOMCpoles)]

Unfortunately, this results in a large deviation in phase at higher frequencies (~60 degrees at 1 kHz, see attached figure) while recent measurements using an incorrect calibration filter do not suffer from this large phase deviation. The phase deviation is due to application of the analog and digital AA on the Pcal. Why?

2) I constructed an O2 version of the front-end calibration time delay diagrams based on the model (see attached), but when I look at the GDS correction factors to be applied to the CAL-CS channels, I do not find matching delays. In addition, the values obtained to not mesh with the recent work done at LLO (see LLO alog 29899). This will have to be investigated further tomorrow also.