This afternoon, there was a window of opportunity to take ETMX and ETMY charge measurements.  Results are posted below.  Kissel is suggesting that I add another plot, but since it will take a while to work through I'm deferring to Monday, sad as he now is.  Charge is still accumulating and we need to think about flipping the bias soonish.

This AI chassis was removed as mentioned in the following alog entry
  https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=21081

In seeking to find what was wrong with the chassis, I powered it up.
The following output channels were glitchy when their respective inputs
were terminated:
 Channels: 1, 3, 6, 8, 9, 10, 11, 14 and 16

Don't know why yet but the AA/AI boards (D070081-v6, S1103146, S1200704)
are a little warmer to the touch than usual (I think).  Channels [1-8]
are on S1103146, channels [9-16] are on S1200704.

EvanG, Travis, Darkhan,

Today we repeated Pcal end-station measurements at EX, the procedure is described in T1500063. Rough readings from dataviewer and GPS times are given in the attached notes.

The outer beam still show a significan drop in power between Transmitter and Receiver modules, earlier we thought that the beam was not well centered at the input port of the RxPD integrating sphere, but by looking at an outer beam spot with IR viewing card it does not look to be the case (see attached picture).

Earlier this week we took a similar set of measurements, but we suspected that WS/TX when WS is inside of received module were not taken properly and today's measurements were taken as a double-check (LHO alog 24726).

We will post a full report and some conclusions soon.

We've continued measuring the beam spot positions once a week as part of Tuesday maintenence. 

The 2 pdfs below are different views of the same data set.  The first set of plots is the data on x-y grids, so you can really see how little our spots are moving.  The second set of plots is the data as a function of time.  Some of the pitch values are changing more now than they were back in October, but the maximal excursions are still only about 2mm away from the means.

I started welding the turbo header piping under the beam tube at Mid Y back together today. The first weld was started at approximately 10:17 PT and lasted for ~45 seconds. The next welds were at ~10:36 and 10:46: PT and each lasted for ~ 90 seconds. There will be more welding next week.

FRS #3896

The ~hinj account on h1hwinj1 is now being backed up to the daqsvn.ligo-la.caltech.edu computer every hour.  This should close out FRS ticket.

Sharing learning laterally across the Observing Sites

The Detector Engineers and Operators review together the faults in the FRS that caused observing time loss.

The circumstance surrounding each fault  is reviewed and a discussion of whether the response in each case was appropriate and what is now in place to mitigate repeat occurrence.

See LLO log entry 24196

https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=24196

J. Kissel

In order to begin exploring the systematic discrepancy between model and measurement below ~30 [Hz] in the IFO's sensing function (see, e.g. LHO aLOG 24709), we've taken PCAL2DARM and DARMOLGTF transfer functions at the normal amplitude and at half amplitude. Sadly, the IFO lost lock during the last few (low frequency) data points of the last half amplitude DARMOLGTF, but I think we have enough data to make a comparison. 

Premiliminary message: there's no obvious, unexpected difference between normal and half amplitude. Coherence is less, so the data points are a little more scattered, but no surprise there.

One thing of note, while watching the DARM ASD during the measurement, there are no signs of higher harmonics in the PCAL excitation, but once the DARM OLGTF (as driven by the ESD and subsequent upper stages) reaches ~20 Hz, one can clearly see a second harmonic in the ASD meaching along right behind the fundamental excitation frequency. To give a feel, during the normal amplitude drive, once the excitation hit ~15 [Hz], the second harmonic's amplitude was roughly 3.5 orders of mangitude below the fundamental (but still clearly visible thanks to the discrepancy between the 10 and 30 [Hz] sensitivity). Recall that the linearization for ETMY is *not* on in the IFO's lowest noise state. The EY bias voltage remains -380 [V] (with an effective bias voltage from charge of ~ -20 [V]; see LHO aLOG 24547).

We leave the IFO down for the PCAL team to explore PCALX problems (see LHO aLOG 24726), and so Betsy can grab this week's charge measurements on ETMY.

Analysis of the data to come later, but the files live here:
/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/PostO1/H1/Measurements/DARMOLGTFs/
2016-01-08_H1_DARM_OLGTF_7to1200Hz.xml
2016-01-08_H1_DARM_OLGTF_7to1200Hz_halfamp.xml

/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/PostO1/H1/Measurements/PCAL
2016-01-08_PCALY2DARMTF_7to1200Hz.xml
2016-01-08_PCALY2DARMTF_7to1200Hz_halfamp.xml

Found h1nds0 to be dead with a kernel panic, rebooted.  Did not cycle power, just reboot.

TITLE:  1/8 DAY Shift:  16:00-00:00UTC (08:00-04:00PDT), all times posted in UTC     

STATE of H1:   OBSERVING (but taken out at 8am for calib)

Outgoing Operator:  Patrick

Quick Summary:

Nice H1 hand-off from Patrick (H1 has been locked since Cheryl locked it last night and it is going on 10+hrs).  Range has been hovering at a flat & quiet 80mpc.  useism looks like it's been dropping over last 12hrs & LVEA is currently at 0.55um/s in LVEA.  Winds are under 4mph.  

Patrick mentioned nds0 being down (symptoms:  (1) nds0 white boxed  & (2) edcu red-boxed on overview) & that David has been notified.

Jeff took H1 promptly at 16:00utc for Calibration.  

• 16-18:00UTC:  Keep H1 UP for Open Loop Gain (OLG) & PCal measurements.
•  18:00UTC:  H1 will be taken down for:
  • ETM charge measurements
  • PCal work at EX.

TITLE: 01/08 [OWL Shift]: 08:00-16:00 UTC (00:00-08:00 PDT), all times posted in UTC

STATE Of H1: Observing @ ~ 79 MPc.
SHIFT SUMMARY: Remained in observing entire shift. 3 SUS ETMY saturations. Left a message with Dave that nds0 is down. H1:LSC-POP_A_LF_OUTPUT has been stable.
INCOMING OPERATOR: Corey

Have remained in observing at ~ 79 MPc. 3 SUS ETMY saturations. H1:LSC-POP_A_LF_OUTPUT stable.

nds0 is still down. I have left a message for Dave.

Ops Eve Summary: 00-08:00UTC, 16:00-23:59PT

State of H1: Observe, range 79Mpc, POP_A_LF stable

Fellow: Darkhan

Shfit Summary:

Calibration measurements until about an hour into my shift

Locking went well, and made it past DRMI

Calibrations needed H1 in not-DRMI, so I broke the lock

Calibrations continued, then back to locking

Even after having been out of lock most of the day, H1 locked and went back to Low Noise

Relocking Issues:

• find IR in both DIFF and COMM needed to be helped in order to stablize the are power
• first lock broke right after ENGAGE ASC part 3, so subsequent locks I paused at each ASC part
• power only went to 10W - something Sheila and I had changed while troubleshooting H1 yesterday
• IMC SDF showed up during the lock

Changes: 

I restored the gaudian to requestion 23W instead of 10W. JeffK had suggested it, and I emailed Sheila, and she said to go ahead.

TITLE: 01/08 [OWL Shift]: 08:00-16:00 UTC (00:00-08:00 PDT), all times posted in UTC

STATE Of H1: Observing @ ~ 78 MPc.
OUTGOING OPERATOR: Cheryl
QUICK SUMMARY: 
From the cameras:
The lights are off in the LVEA.
The lights are off in the PSL enclosure.
The lights are off at end Y.
I can not tell if the lights are on or off at mid X, mid Y or end X.

The winds are less than 10 mph.

From pinging:
CDS WAP is off at the LVEA, end X and end Y.
CDS WAP is on at mid X and mid Y.

nds0 is down and the EDCU is red.

Screenshots of the seismic bands and ISI blends are attached.

J. Kissel, K. Izumi

We're too exhausted to write the aLOG this deserves, so we'll just say "we did it!" and leave plots and conclusions until tomorrow. The message: from what prelimiary analysis plots we have made, we can say that these new results are consistent with those taken during ER8, modulo the well-tracked change in kappa_{TST} (the EY L3 ESD actuation strength). Stay tuned!

We can also say that using ALS DIFF instead of a single arm locked on red has drastically improved the statistical uncertainty of the Free Swinging Michelson method -- thanks LLO!

Manually filled CP3 -> Opened exhaust check valve bypass -> Opened LLCV bypass valve 1/2 turn ccw -> LN2 evident at exhaust after 29 minutes 30 seconds -> Closed LLCV bypass -> Closed exhaust bypass valve after several minutes -> Confirmed with Gerardo that we are performing this exercise following the same prodedure -> I cannot explain the discrepancy between the fill times between today vs. the previous fill unless the LLCV bypass valve's stop-to-stop is very course and our "1/2 turns" differ significantly.  

Next manual over fill of CP3 is scheduled for Saturday before 4:00 pm 

RickS, Darkhan,

Yesterday, Jan 5, 2016, we took Pcal end-station calibration measurements at EX using WS1 calibration standard. The measurement procedure is described in T1500063.

Rough numbers from dataviewer and GPS times were noted in the attached scan (blank form is taken from T1500062).

A generated report (comparison with previous measurements) was uploaded to DCC T1500129-v3.

At first when we started the measurements we found out that laser power in PcalX is modulated through Pcal hardware injection channels H1:CAL-PINJX_*, we had to restart the measurements after tuning off these excitations.