Results of ETMX main and reaction chain top mass transfer functions for Phase 2c, after final alignement, are attached below. Most of the measurements are showing good agreement with the model, except for pitch, as on last thursday. The first two modes of the main chain @~0.55Hz and ~1.30Hz appears to be shifted down in frequency (page 5 of first pdf). The second pitch mode of the reaction chain @ ~ 1.33Hz is shifted up, and we can see vertical to pitch as well as transverse to pitch cross couplings from the extra 2Hz and 2.22Hz resonnances (page 5 of the second pdf). After plotting ETMX pitch transfer function against other fiber quads (3rd pdf), it seems like a common feature between quads. The results will be discussed during the sus meeting, but are approved for now since livingston ITMY looks identical.

Plots attached are described below :

1- H1 M0-M0 ETMX phase 2c main chain top mass transfer functions (in red) against "fiber" model (in blue), for the 6 degrees of freedom

2- H1 R0-R0 ETMX phase 2c reaction chain top mass transfer function (in red) against "erm (end reaction mass)" model (in blue), for the 6 degrees of freedom

3-a) Pitch to pitch main chain comparison between model and other fiber quads : L1 ITMX (June 2013, orange), L1 ITMY (Mai 2013, black), H2 ETMY (Mai 2013, pink), H1 ETMX (last week during alignement, cyan) and H1 ETMX (end of last week after alignement, green)

3-b) Pitch to pitch reaction chain comparison between erm model, H1 ETMX (most recent) and H1 ETMY (Mai 2013)

In response to Jeff.K's request I set up the IMC autolocker so that it can automatically lock itself. So far it seems locking without difficulties. The IMC autolocker had been intentionally disabled until this evening for allowing people to run some measurements on the SUS/HEPI/ISIs. Jeff.K is volunteering to remotely run some cross-over measurements which I haven't finished (alog 7369) as a part of the IMC characterization. So Jeff, it is all yours until everybody wakes up !

The autolocker script, which I copied from Chris's original one and temporarily named as rudimentary_autolocker.2013.Aug.12.edition, is running on h1guarian0. It resides in userapps/ioo/h1/scripts/imc which is the usual IMC scripts place.

0800-1000 High dust counts (+3000PCF@.5um) in EY while Apollo works on equipment staging.

0900 Pablo working in H2 enclosure

0910 Karen will be opening LVEA exit doors during cleaning

930 Thomas aligning optical lever to check for B coupling on PR3

1430 Pablo working in H2 enclosure again. All the time. Every day.

1500 H1 enclosure and PSL environmental sensors go slightly wacky. Readings of -4F and 0% humidity in laser room and anteroom. Maggie and Daniel working on Beckoff system.

Nothing really sensitive on this platform at the moment but the system is floating; please be mindful of the blue crossbeams.  We'll do Optical Table positioning tomorrow if IAS is available.

Today we relocated the E-module and the newly assembled clean room skeleton, as well as other extraneous "stuff" @ end y to allow for vinyl flooring installation to proceed tomorrow. We also started removal of FFU's and lights from the clean room located at ham 4 which is approximately 50% complete. Machined some vacuum accessories for Cheryl V. 

Transfer functions were runnning over the weekend on HAM2 and HAM3 ISIs (tilt decoupling frequency meausrement).

Measurements are complete. Isolation loops, and HEPI alignment offsets were turned back on.

Found computer completely unresponsive, rebooted.  Had to manually mount /ligo file system.

The transfer functions measured recently on HAM6-ISI featured a discrepancy between what was seen by GS13-V2 (purple curve), and what GS13-v1 (cyan) and GS13-V3 (yellow) would see. 

Thinking GS13-V2 could be saturating, we tried taking a new set of measurements over the weekend, with lower actuation. Reducing the actuation did not change the shape of HAM6-ISI TF, as seen on the latest results.

I am on site (briefly) to verify vacuum system is Ok - it is - leaving now (1215 hrs.)

I removed the screws and washers from the peek clamp bracket.  Washers were not reachable, but I was able to push them to a place where they dropped into a temporary foil shield I installed under the top mass.

Keita and I then removed the peek clamp and bracket by lifting it from the bottom and hooking it from the top with a dental pick.

Cable connectors were threaded from the top down, past the blade spring on the -Y side, with the orientation defined in D0901880-v5, while cables were held out of the way on the other side of the "H" slot in D1200469-v1.

Pictures:

P1030993 - peek clamp and bracket
P1030995 - bracket screw removed - loose washer remains
P1030997 - fishing for the peek bracket
P1030999 - bracket caught
P1050005 - "H" slot as seen from below before threading cables
P1050006 - "H" slot as seen from above before threading cables
P1050009 - "H" slot as seen from below after threading cables
P1050011 - "H" slot as seen from below after threading cables
P1050020 - cable connector seen from the side, as it just fits through 
                      the "H" slot around the blade spring (-Y side, left in this picture)

(Alexa, Kiwamu)

I have attached the following graphs:

1) The most recent noise budget produced by the ALS HIFOY model

2) Plot of all the contributing sensor noise to the IR noise before applying the CARM control  (which is why we do not see a knee at high frequency when comparing to the noise budget graph)

3) Infrared Noise assuming:

S_IR  = S_sensornoise                                      for f < UGF of CARM feedback

S_IR = UGF/f * S_sensornoise                          for f>UGF of CARM feedback

Thus, we are assuming a 1/f behavior above the UGF, which should overestimate the RMS. This graph includes the current acoustic noise and that with the acoustic noise lowered by a factor of 10 predicted by Robert for the science run.

4) Plot of RMS vs UGF of CARM feedback. This graph indicates if the acousitc noise is lowered by a factor of 10 the UGF of the CARM feedback can be increased while reaminig under the noise limit of 8Hz.

Starting a new round of transfer functions on ETMX over the week end. GPS starting time = 1060127914

Kyle 

Had valved-out inst. air to LLCV this morning while manually filling CP1 -> Hand over to PID control re-exposed known quirk with CP1's pneumatic actuator control box, that being a gas-column oscillation -> I adjusted (cw) the damping jet until the oscillations stopped -> Control behavior may be different as a result 

I will monitor from home

Work at LVEA – Richard

375 ml of distilled water added to the crystal chiller – Justin

Testing ITMx ( Spectra Test ) - Arnaud

We had tried some whack the Crossbeam repairs but this did not improve the response so we've exchanged:

                 C2      C4
Pulled  L41343  L41439
Install  L41451  L41333

from BSC1.

After the alignment of the ETMX, a quick spectra has been ran, to check for rubbing.

The attached pdf shows a comparison between monday's (2013-08-05, in blue) and today's (2013-08-09, in green) undamped spectra, for the main and reaction chain top mass 6 degrees of fredom. Main resonnances haven't moved since then, and thus, the quad looks to be freely suspended, without any major rubbing. 

Last nights transfer functions didn't succeed, because of a bug in the automated script. It has been fixed, and the tf will be reran over the week end.

A short list of updates for the vacuum workstations:

- I have corrected the issue with some paths embedded in the local VE MEDM files that prevented some displays from working when /ligo was not mounted.  All local MEDM files should now not depend on any servers being mounted.

- DNS servers were modified to point to ns0 and ns1, which did not exist when the workstations were installed.

- I have removed hanford2 from the fstab.  It's filesystem is now sufficiently trashed enough to not be useful.  /ligo is still mounted read-only, to allow the use of Data Viewer.

- The latest OS updates were applied, and the workstations rebooted.


In addition, the control room Centos vacuum workstation has been upgraded to look like the rest of the workstations installed in the outbuildings, since the Centos box depends heavily on hanford2 and was thus not very useful anymore either.

The VME crate for the LVEA Y arm vacuum controls failed last night.  From initial investigation it looks like the power supply died.  I have swapped out the crate with a different one and re-installed all of the cards and cables.  Cyrus assisted in getting it back up and running. See his report.

Found CP1 level @ 23" WC = 55% full at 0830 -> Determined CP1 LLCV fully closed via removing inst. air and observing no stroke -> Begin manual filling of CP1