A quick DAQ restart to force the EDCU to reconnect to LAB DUST EPICS channels. No reconfiguration made.

Over the past two days, B&K hammering measurements have been carried out on the ITMX and ETMX.

For the two measurements, the suspensions were fully payloaded, vibration absorbers were mounted on the structure, and the ISI was still locked.

A tri-axis accelerometer has been mounted on the corner of the structure, and the hit was given with a hammer at two different locations (front and side) as showed on the two pictures attached (1) for ITMX and (2) for ETMX. The pls template SimpleHammerDisplay3 from T1000697 was used to take the data, with a force threshold set at 10N.

Plots in "2013-09-13_H1ETMX_H1ITMX_ISI_Locked.pdf " are showing a comparison between the results for H1 ETMX, H1 ITMX, and L1 ITMY X resp to X exc on the 1st plot and Y resp to Y exc on the 2nd plot. The main resonnance below 150 Hz is well damped in both directions, for both suspensions.

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Data (ascii and pls files) are located in /QUAD/H1/${ETMX/ITMX}/BandK, plotting script (BandK_plot.m) is located in /Common/Matlabtools/, and pdf results are located in /Common/Data/BandK. They have been commited to the svn. 

The sei test stand is now back on track and up to date with the last svn version (4455).

The front end IP address is 10.11.0.23 (seiteststand2). Two workstations are connected to the test stand network:

- stormy.ligo-wa.caltech.edu

- 10.11.0.94 --> use this station for the graphical display (especially on the Mac in the high bay)

The channel names for the test stand are ITMX channels (example: X1:ISI-ITMX_ST2_GS13INF_V3_IN1_DQ). Everytime we are testing a new unit, the result will be saved into the X1/ITMX/ arborescence.

*** Testing procedure for a new unit ***

Here's an overview of the different steps to do when a unit is tested.

1. Create the folder structure /X1/ITMX. You can either do it by hand or use the following function: /ligo/svncommon/SeiSVN/seismic/BSC-ISI/Common/Misc/Arborescence_BSC_ISI.m

2. Follow the document DCC#E1000486 to do the testing

3. When the testing is done and everything is saved into the good folders, rename the ITMX folder with the good name (ex: Unit_5). The different data are still going to be called with an ITMX name, but the overwall folder will have the good name. It will be enough for us to keep track of our units. The easier way to rename the ITMX folder is to use svn rename (ex: svn rename ITMX Unit_5)

4. Be sure to svn commit everything at the end.

5. Repeat the process for the next unit.

Day shift summary
08:00
LVEA Laser Safe
Alarms: Dust

09:39 Hugh at HAM6 working on HEPI
09:50 Cory & Andres at End-X working on face stops on ETM-X
10:06 Alexa working in HAM6/Squeezer bay – Bay is laser hazard
10:23 Cyrus Removing old network switch and relocating dust monitors
10:27 Gerardo & Tyler working on the ACB assembly at the LVEA SUS test stand
10:35 Andres working on cabling the SM HAMs 
11:15 Instrument Air alarm on PT599 at End-X; Informed Kyle 
13:47 Kyle in LVEA to shut GV2 
13:57 Gerardo working on ACB assembly at the LVEA SUS test stand
16:00 Patrick recycling dust monitors in optics lab 

GregG, JimW

After SUS, et al. finished locking the ETMx optic, Greg and I went to the end station to work on balancing the ISI and route some cables. We first uncovered the ISI and finished routing the various cables that have been added since the TMS was mounted (still have the ESD cable to route, I forgot it was up there ...). After doing a "feel" test of the lockers to make sure our payload wasn't way off, we unlocked stage 2 the ISI. When I went to look at the CPS signals in dataviewer I saw we had problems. One possible dead CPS (maybe just railed, the lockers on St2 let you do that) , and one entire corner (4 sensors) that is just reading electronic noise at ~1 ct. Hopefully the dead conrner just means I forgot to turn something on. Preliminary spectra on everything look good, so no show-stoppers so far. Too late today to fix everything, so we'll come back to it on Monday.

I finished the removal of the Foundry switch in the LVEA, and the Dell switch in the MSR that was supporting the Foundry switches today.  This completes all the work covered in WP4127, now closed.

The connection was lost after Cyrus's network work today (work permit 4127).

ETMx Silica-tipped Earthquake Stops Positioned on Quad (Andres, Corey)

The face EQ stops for the ETMx needed to be positioned, but we don't want "glass on glass" contact.  We didn't have thin teflon strips to insert between the EQ stops and the glass, so per Betsy's suggestion, we used Alpha Wipes as a buffer between the Stops & Glass.

SUS TMS Cable Fixed

Installed screws on an in-vac cable which had these screws missing from its connector.  All TMS cables are good to go for dressing on the ISI.

ITMX transfer functions ran overnight are showing a better agreement with the model after the recent modifications (see alog 7755). Results are described below

(1) In black ITMX last TF, after aligning two top mass osems and adjusting lower mass face EQ stops , compared with the measurement took 2 days ago, after having retracted top EQ stop touching the top of the test mass (in orange), compared with the model

(2) In red, ITMX last TF compared with wire rehang model

Data Scripts and PDF files have been commited to the svn

In preparation of RGA scanning later today

Just checked the ITMx alignment after the latest round of rubbing fixes.  Bottom line is the ITMx is still within spec and aligned.  Position alignment still remains unchanged from log 7638.  Pitch/yaw numbers are as follows:

• Pitch Error: 37 µrad down
  • Actual Pitch: 656 µrad down
  • Target Pitch: 619 µrad down
  • Tolerance: ±50 µrad
• Yaw Error: 15 µrad CCW
  • Target Yaw: 0 µrad
  • Tolerance: ±50 µrad

J. Bartlett, M. Barton, J. Kissel, A. Pele

Catching up on a lot of measurements with overdue aLOGs. Executive summary -- we think the QUAD is free, but we're taking overnight TFs to confirm. The main chain is the problem, reaction chain looks great.

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After initial "release" of H1 SUS ITMX as a wire(re)hang glass test mass, Arnaud had taken a set of transfer functions (2013−09−09) that revealed rubbing. Bartlett then investigated, and found some barrel stops on the main chain (M0) test mass were in contact. Arnaud then took another set of overnight transfer functions (2013−09−11). However, those transfer functions revealed poor results as well, still indicating rubbing somewhere on the main chain. 

Bartlett went in to investigate, and immediate found "face" EQ stops rubbing the front of both the PUM and TST. Once these were alleviated, in order to get a quick turn around Kissel took as set of DTT transfer functions. Though the results showed significant improvement, poor coherence still remain in the 0.5 [Hz] region for most DOFs, and a vertical mode (at 0.51 [Hz]) stuck up in the ROLL degree of freedom. Both raised suspicion that we might not yet be out of the woods. The problem regarding the V feature in the R TF is in this region where the TFs had very little coherence. So Kissel cooked up a (very plausible) story (IHHO), about a locked ISI and lots of air currents leading to lots of vertical motion (especially with the QUAD undamped) which, for a poorly aligned sensors, would result incoherent, common mode (vertical) noise in the differential (roll) transfer function. We've seen this before on many suspensions (and suspension types), and seen it get better and/or disappear both with an unlocked ISI, and when in-chamber.

After some further discussion, Bartlett went back in and re-centered the M0 RT and M0 F1 OSEMs about their flags (which he said were visible mis-centered, if not even rubbing themselves, see LHO aLOG 7752). The feature was certainly reduced after this, but still present (and with even less coherence). To further support the theory of too much ambient motion, we (a) took a (DTT) swept sine TF in this frequency band, which also revealed low coherence (not attached), and (b) took a (DTT) white noise transfer function with the V damping loop ON (ONLY). (a) revealed that even with all the power focused in this frequency region (as Arnaud says it "the best possible drive"), we still were not able to obtain good coherence. (b) Further reduced the feature becomes ill-defined, to a point that it begins to just look like "normal" incoherent noise. Note that we *only* looked at ROLL after Bartlett re-centered the OSEMs.

The first attachment shows the white noise, M0, ROLL (only) investigations, the second attachment documents all of the complete set of M0 TFs we have from 2013-09-09, 2013-09-11, and today (2013-09-12). The third attachment shows that the reaction chain is great.

Because it's "free," we're taking over night Matlab transfer functions, which hopefully will have good SNR on Roll, and it will also allow us to check the rest of the DOFs, to make sure those are still fine.

A new round of overnight TF on ITMX has been started at ~6pm.

The connection was lost after Cyrus's network work (alog 7753).

The old iLIGO Foundry ethernet switches were deinstalled from the outbuildings (MX,MY,EX,EY) today (see WP4127).  The remaining FMCS and serial server connections were moved to the replacement switches in the process.  Work will continue tomorrow in the AM to remove the last remaining switch from the LVEA, and the supporting switch in the MSR.  Then the last vestiges of the iLIGO network will be expunged.  (Yay!)

   The transfer functions showed the rubbing issue from this morning has been resolved, however they also revealed cross coupling. Found the F1 and Rt top BOSEM flags close too if not touching the side of the BOSEM. I have adjusted the centering alignment of these BOSEMs (and checked the other four). Arnaud will rerun the transfer functions tonight.   

   Put ETM-X in stops so Seismic can adjust weight on ISI. 

   Overnight TFs showed rubbing on ITM-X. Found all four Rt side face stops on the main chain penultimate and test masses touching. Retracted the stops and checked the rest of the stops on the suspension. Arnaud is rerunning the transfer functions. 

- "Roofers": material on the OSB roof

- Arnaud: measurements of ETMX structures resonances

- Richard: from ~10:00 to ~10:30 working on GPS antennas

- Bubba: Mid Y crane

- Jeff B.: End X work (ask him for more deatils)

- Cyrus: End Y, Mid Y works (check work permit 4127 or ask him)
 

Firefox crashed again, so, I just open a terminal and:

    $ rm -r /ligo/home/ops/.mozilla/firefox

a bookmark can be found in Documents/pablo/

Have a great evening!

pablo

In the optimal laser configuration (current = 1.503A, see alog7695), the power before ALS-FI2 was measured to be 39.7mW, while the power after the FI was measured to be 37.6mW. Thus, the throughput of the ALS-F12 was about 94.7%. The first jpg (532nmALSfI2FullCurrent.jpg) shows the beam profile after the ALS-FI2.

The first pdf (BeamProfile532nmRefALSFI2.pdf) is a graph displaying the mode measurement of the 532nm beam with ALS-F12 as a reference. Meanwhile, the second pdf (BeamProfile1064nmRefALSM1.pdf) is a graph displaying the mode measurement of the 1064nm beam with ALS-M1 as a reference. Using the 13.5% width (or 1/e^2 diameter) of both the horizontal and vertical profiles, the radii for the two profiles were determined at various distances from the respective reference points. In addition, the graph includes error bars of one standard deviation. A line of best fit was produced, and the difference between the line of best fit and the data points was plotted in the lower portion of both figures.