09:03 Vern to end X
09:07 Jim W. and Sebastian to LVEA to turn off HAM3 HEPI pier pods
09:14 Hugh craning in LVEA
09:26 Jim W. and I turned off sensor correction at end Y
09:31 Corey and Grant to the squeezer bay
09:37 Jeff B. and Andres to LVEA west bay to move 3IFO parts
09:43 Travis to end X
09:57 Hugh craning in LVEA
10:00 Jodi out of LVEA, reports clean room between HAM2/3 is on
10:03 Doors back on end X
10:39 Mitchel parking crane in LVEA
10:52 Hugh and Mitchel out of LVEA
10:57 Rick to end Y to work on photon calibrator
11:11 Sheila and Evan turned off clean room at HAM1
11:12 Manny done
11:19 Pepsi truck through gate
11:35 Jeff B. and Andres out of LVEA
11:48 Doug measuring distances for optical lever light pipes near HAM3/4
11:55 Kyle and Gerardo back from end X (started pumping)
12:52 Betsy putting parts in the cleaning bay
13:02 Filiberto to end X to look at cabling
13:04 Corey to squeezer bay
13:28 Aaron to end Y, PCAL cabling
13:51 Aaron done
14:40 Elli working on IOT2

Cyrus and I ran fsck on h1conlog3
Dave tested compilation of frontend models against RCG 2.9
In chamber work was completed at end X

Attached is a trend of the average LVEA temperature showing the daily ~0.2 deg C temp swing.  The plot is for the month of August 2014 when we were finishing installation of the vertex.  When we are vented and adjusting the EQ stops of a suspension we may see a ~0.06mm change in the gap of the EQ stops around the barrels of the PUM and Test Masses in the QUAD daily.   (0.2degC change x ~0.3mm/1degC temp change = 0.06mm)

This is pretty negligible.  Phew.  However, this temp change pitches the suspension, so now I'll try to find out by how much.  To be continued...

I performed a "make World" compile of all front end models. The following failed compilation:

• all ISI models (ham and bsc)
• SUS models PRM, PR2, SRM, SR2
• h1lsc

All the failures are due to filtermodule-with-control parts with disconnected inputs (unused inputs must be grounded for RCG2.9). The compiler fails at the first error, more parts may need grounding.

ISI-HAM

part not grounded: HAMn_L4CINF_V1

file: isi/common/models/isihammaster.mdl

ISI-BSC

part not grounded: OPTICNAME_ST1_L4CINF_H1

file: isi/common/models/isi2stagemaster.mdl

LSC

part not grounded: PSL_POWER_SCALE

file: lsc/common/models/lscpsl.mdl

SUS

part not gounded: <RC>_M3_LOCK_L

file: sus/common/models/RC_MASTER.mdl

This file is unique to LHO, L1 still uses the MC_MASTER.mdl

The sensor correction is installed and ON on all the chambers, but with a nominal matching gain of 1.

I made a small script to calculate the correct matching gain for X, Y, Z. The script works only for the HAM-ISIs for now, but it will be pretty easy to adapt. What it does:

- Grab the ground seismometer and GS13 data in X, Y, Z.

- Calculate the ASDs and calibrate them in m/rt(Hz).

- Calculate the GS13 over Ground ratio.

- Take the mean of the ratio for a [0.1Hz 0.4Hz] bandwidth.

Before running this process, the ISI needs to be in High blend mode (750mHz) on all DOFs with sensor correction OFF.

I've done this exercise for HAM4-ISI. The numbers seem a little small (Gain for X: 0.8784, gain for Y: 0.8702, gain for Z: 0.8574) but brings some improvement (see plot attached).

This has been done during the day, we might want to do it overnight for better tuning.

I'll do the other chambers ASAP. The script that I made is for now commited in the HAM4 folder of the svn:

/ligo/svncommon/SeiSVN/seismic/HAM-ISI/H1/HAM4/Misc/gain_matching_calculation.m

So far so good.  Attached is a plot of the EndX station temp (degC), pressure (torr), and suspension vertical sags (um).  We're only at ~20Torr and falling but the suspensions in this chamber look to be sagging by the expected amount.  No sharp changes in the shift to indicate poor health.  The temp change that John made yesterday seems to be stabilized.  We'll run TFs on the ETMx after the buoyancy effect has stabilized (almost complete now as shown in the ~100um drift down on the sus V trends, but we'll wait a bit longer to be sure).

Sheila, Jeff, Thomas

We changed the H1:SUS-$(OPTIC)_ODC_CHANNEL_BITMASK from 1 to 0 for all the LOCK States for the following optics:

• - BS
• - ITMs
• - ETMs
• - PRs
• - MCs
• - OMC

I have tarred up and compressed the h0 and h1 burt snapshots for Sep and Oct 2014, gaining us a whole 2% of disk space in /ligo.

Jim, Sebastien

We did a high resolution measurement on HAM3-ISI (bandwidth of 1mHz), with and without the sensor correction. At this point, we can say that:

- the feautre appears only when the sensor correction is ON

- it appears on all DOFs except RZ

- it's a very high Q 0.66Hz feature. This last point convinces us that it must be an electronic issue somehow.

I attached the plots and committed the DTT sessions of those measurements in the svn:

/ligo/svncommon/SeiSVN/seismic/HAM-ISI/H1/HAM3/Misc/HAM3_debug

/ligo/svncommon/SeiSVN/seismic/HAM-ISI/H1/HAM3/Misc/HAM3_debug-with_SC

We also checked that this feature was not due to a beating between the HEPI IPSs. We turned the position loops of HEPI HAM3 off. We even powered off the pier electronic boxes we no change: the peak is still here when the sensor correction is ON.

The investigation continues...

The door is going back on at BSC9 after having the door off for ~45 minutes.

The temperature at ENDX has been set to 68F. Hopefully we can keep it there. This is now the same as ENDY.

The plot shows 2 days of trend.

Evan, Alexa, Thomas

We repeated the Y arm loss measurement that we did yesterday in alog 15919. We followed the same steps and found: green TR buildup was 1.018, IR TR buildup was 11.2(0.5), Poff = 1303(5), and Pon = 1251(5). This gives a loss of 155(19)ppm, which is still suffeciently low, and within uncertainity of yesterday's measurement. This confirms that we are aligned to a good spot, and there is no need to adjust the green QPD offsets.

Just for reference: when we run the ditherAlign TMSY script the maximum normalized PD1, PD4 values are 1.38(0.05), 1.09(0.05) respectively.  

Bubba is tied up with pulling a BSC door so I am posting a few photos for him.

Progress report on the DCS work:

Refrigeration piping continues, sheet metal work inside is almost done, and electrical work is well underway.

Rich, Jim, Seb, Fabrice

We can only see this noise line when the sensor correction is ON, so we have been chaising it in the the sensor correction channels, but could not find anything.

We are back to noise hunting in the ISI channels.

- The first plot attached shows  ASDs with sensor correction ON (2 nights ago). The amplitude of the peak is 2.5e-8 m/Hz^0.5

- The second plot shows ASDs with sensor correction OFF (last night).  The amplitude is 8e-9 m/Hz^0.5. No visible noise line...

We are getting the ISI local sensors data on HAM2 and HAM3 with the sensor correction OFF,  to perform signal subtraction, and see if the noise line could be burried in the seismic signal (and somehow amplified by the sensor correction?)

(Doug C and Suresh D.)

    This afternoon we replaced the glitchy diode laser  (Sl. No. 193) in the BS optical lever with a repaired and thermally stabilised laser (Sl. No. 130-1) which was under observation in HAM3 oplev.     The attached plots show the improved performance due to the repairs and stabilisation.

Things to note:

1) Broadband noise injection into pitch has disappeared after swapping the lasers

2) Constant glitching and consequent broadband injection of noise into yaw signals has disappeared after swapping.

3) The RIN has dropped by an order of magnitude at all frequencies

4) The spectrum is stable and does not oscillate between stable and unstable regimes as the temperature in the LVEA changes due to the airconditioners.

Please note that the laser is still approaching a stable operating condition and is under observation for a futher 24 hrs.  However its performance over the past six hours is satisfactory.