J. Kissel, B. Weaver, M. Landry, S. Biscans, C. Remet H. Radkins, T. Vo, B. Gateley

*phew* 

The last known in-chamber payload suspect in the misdemeanor seen earlier with the ISI-ITMX vertical transfer functions was the teflon rails that were temporarily installed on the SUS-ITMX for first-contact cleaning. So, Betsy and I went out and removed them. Preliminary measurements (attached below) indiciate these were the problem, the ISI looks fine now. We are a go for final cleaning and close up of BSC3 (as agreed by all those listed above). In the next half hour that it takes me to finish writing this aLOG, Sebastien is going to get a few more transfer functions just to be sure we're OK, but Celine (from afar) has been watching the story, and has informed us that she had seen similar badness when she had taken ISI transfer functions with the QUAD locked (with EQ stops), so we 100% confident that things have been restored to goodness already. 

To repeat for clarity,
- It wasn't the dome installation that caused the badness
- It wasn't the arm cavity baffle's eddy current dampers or mechanical rubbing
- It wasn't the in-chamber cabling
It was 300 kg of mass (the suspended elements of the QUAD) that had been temporarily locked up with teflon rails for the (new, yet) normal first contact routine.

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Plot Caption: 
[[ISI-ITMX, Stage 0-1 Actuator drive, Stage 1 CPS sensor response, driven transfer function. 
  HEPI is floating and balanced, ISI is floating and balanced, ISI control is entirely OFF, 
  ACB is freely suspended and Eddy-current Damped, SUS-ITMX is freely suspended with main 
  and reaction chain locally damped with top-stage OSEMs]]
BLACK Known good reference measurement taken over Tuesday-to-Wednesday (2013-Nov-19 to 20) night.
BLUE The bad state the ISI has been since measuring quickly Wednesday afternoon, after 
     Teflon rails are installed, 
     QUAD is first-contact painted, 
     ACB is B&K hammered
     Dome is installed
     ACB is re-inspected
     ISI and other in-vac cabling is inspected (from underneath the ISI)
RED Now good, current measurement, after Betsy removed the temporary teflon rails.

Today, Calum and I cleaned HAM2, focusing on the table and SUS surfaces.  We then pulled the First Contact on MC1, MC3, and PRM and made an inspection.  Hugh also made a final balance and unlocked the ISI.  I took short average TFs of L, P, V DOFs on MC1, MC3, and PRM to verify no major mechanical rubbing.  I also checked SUS health via the ability to close damping loops of these suspensions and also the PR3.  We pulled the first FC sheet at 11:10am and the last door went on at 1:15pm.

Note, during the last vented period, we noted that the PRM cleaning was not very sucessful and streaks were observed on the HR surface.  We chose to leave the mess at the time.  The FC cleaning we did yesterday/today seems to have worked as I could not see any such streaks on the optic.

Today, in the final steps before putting the doors on HAM2, we laid a fresh witness plate (wafer) near to the center of the table.  It is in the area slightly behind PRM.  This is the witness plate that should be picked up and analyzed immediately after the next vent and the doors are off.

The Vertex ISC Cable Pull table (E1200408) has some inconsistencies in bechoff chassis port labeling for the picomotors. The pull table indicates:

• HAM 6 pico cables 182, 183 go to corner chassis 2, port 3
• OL pico cables 305, 306 go to corner chassis 2, port 3

The OL cables were connected to port 3, while the HAM 6 cables were connected to port 5. Based on the EtherCat Systems drawing (D1100683),

• HAM 6 pico cables 182, 183 go to corner chassis 2, port 3
• OL pico cables 305, 306 go to corner chassis 2, port 5

I have correctly connected these cables according to the EtherCar system drawings. The pull list remains to be updated. **

Mark Layne and I went down to Y end to vacuum the manifold between the spool opening and BSC10 (~10 ft). The manifold section showed very little dust accumulation between the time of chamber cleaning and now. There were a few (5-6) whitish flakes close to the spool opening but other than that there was very little for Mark to vacuum up. There is BSC flooring in BSC10 and the flooring hardware is in place.

We left the cleanroom vacuum in place so that the PCal and CPB teams can use it for "Clean as You Go" work during assembly and installation.

Find attached the plots of last night transfer functions.

As you can see, something bad happened at the resonances around 1Hz since we put the dome on. This badness appears on the vertical sensors, both stages. It mostly seems like a rubbing cable.

Hugh and I are going in the chamber right now to see if we can find something.

PS: L4C-H2 presents a gain of 0.5. We'll fix that later.

J. Kissel, T. Vo

After a quick set of transfer functions on the ISI-ITMX showed more irregularities (see LHO aLOG 8653) after Thomas and I finished B&K hammering the Arm Cavity Baffle (see LHO aLOG 8656), Thomas an I went in again, first thing this morning, to investigate the baffle for signs of rubbing. 
We found nothing out of the ordinary:
- The baffle suspension is free,
- The eddy current damper's copper plate (which had caused problems before) were completely free of the suspended magnets, and the gap size was roughly 2-3 [mm]
- The the cable situation looked no different that when we had a clean set of ISI TFs.
We spend about an hour, moving things around, wiggling cables, ensuring things free by manually exciting things, but could not find anything that would cause such a drastic effect on the ISI. I attach the same quick transfer function that Seb took yesterday, 
BLACK shows the nominal result; what we expect to see if everything's peachy-keen.
BLUE shows the result just before we went into the chamber this morning. It indicates the same bad result [as expected, since nothing should have changed over night].
RED shows the result just after we came out of the chamber, having inspected the ACB. It's the same as blue, indicating that (a) we didn't change anything after messing around with the baffle (we were worried that just looking at the ACB's ECD system the wrong way would cause badness), and (b) we can't change the ISI result by messing around with the baffle (moving things around, shaking stuff, etc, etc, i.e. the ISI is rather insensitive to the baffle).

The important point we realized just as we were about to go into chamber: the other thing that happened between the noon (good) measurement of the ISI and the evening (bad) measurement of the ISI, was that the BSC dome was installed (see LHO aLOG ) After discussion with Sebastien, it makes much more sense that such a big operation is far more likely to have caused the badness that just tweaking / B&K hammering the ACB. The seismic team has now launched been launched on a thorough investigation. 

All apologies ACB, you're not such a bumbling oaf after all; maybe just a big, loveable, misunderstood, simpleton. HODOR.

[Chris W, Koji A]

The OMC DCPDs and QPDs were tested with a flash light. All of these are responding to the illumiantion.

Here is the confirmed connections:
DCPD (Transimission side of the BS) -> The DCPD B channel in the OMC model
DCPD (Reflection side of the BS) -> DCPD A
QPD1 (Short arm) -> QPD A
QPD2 (Long arm) -> QPD B

The modules were turned off after the test.

[Rich A, Koji A]

The OMC cables at Rack 5 were checked.

The OMC uses the split variant of the whitening chassis (D1002559) at U18, instead of the installed one.
Rich found the correct front panel module at the EE lab. The new front panel was installed. This allowed us to connect
the DCPD cable (#307 cable) which had been hanging at the side of the rack. (Note to myself: The module should be labeled)

We also found the DB25 cable between U8 and U10 was missing. We brought a DB25 cable from the squeezer remnant.
Cables for Binary IOs are not yet connected. (Note to myself: The DB25 cable should be labeled).

The HV cables are not yet prepared.

+1 cage, -1 blade. One hour of cage adjustment turned out to be infinitely superior than one day of blade adjustment. We're getting retroreflection from ETMX.

Cage = controlled push.  Easier to make small steps because the push screw travel is not mechanically amplified. Loosening/tightening dogs don't affect the YAW/PIT by a big amount, so we just moved it until the angle was good, and tightened the dogs and that's it. And no mechanical interference to worry about (even though we checked).

SUS is taking TMSX TF to check if anything is touching. If good, tomorrow the temporary dogs will come out, we need to change the in-air path a bit as as the beam is clipping at the top periscope mirror, we'll tweak the telescope path a bit and move to the IR QPD path.

Success!

Today, Kate and Travis finished the First Contact application on the remaining MC1/3 mirror and the PRM.  Calum moved all of the cleaning equipment from HAM3 to HAM2 and as I was leaving at ~4:30 he was rolling his latest dust collection tool around on HAM2 hardware.  If they hadn't already pressed through it, we plan to clean HAM2 tomorrow, repeat the FC sheet pulls and TFs on the MC1, MC3, and PRM tomorrow and close get the doors on.  We also plan to pull the FC from ITMx and close that chamber tomorrow after last chamber checks.

Today, Calum and I cleaned the HAM3 table and it's 2 HSTS suspension structures and baffles.  We then pulled the First Contact on MC2 (3:30pm prompt) and gave it a quick inspection.  It looks OK - no super macroscopic particles.  Jim unlocked the HAM3 table and while Apollo put the East door on the chamber I ran a few averages of L, P, V TFs and verified that the MC2 seemed healthy.  I also checked that I could close the loops on all 6 DOFs of damping on both PR2 and MC2.  Apollo then proceded with putting on the West door.  1 (chamber) down, 2 to go.

Sorry for the delay in this status alog:

Today, Calum and I:

- centered the outstanding M2 (lower) stage BS BOSEMs

- set the top BS BOSEMs to account for some buoyancy

- set the top ITMx BOSEMs to account for some buoyancy

- added the 1" witness optic to the ITMx lower structure

- reinforced the First Contact on the ITMx and it's CP in prep for pulling and closing up tomorrow

Note, the last step above required that I semi-lock the optics which I did, and then left in that state since we need them locked for pulling the FC tomorrow.  I had understood that SEI was not needing the evening to do TFs here, although I see Sebastien has started TFs.  I've written him this email:

Howdy, Seb -
I see you started TFs on the ITMx - the ITMx is half locked up... Although it seems like it is damping, there is
1) extra payload on the ISI due to added teflon fixtures to lock the ITMx optic
and
2) the suspension may be damping well because it is infact locked up slightly.

Not sure how this will affect the SEI TFs tonight...

J. Kissel, T. Vo

Because of the recent resonant features seen in ISI-ITMX that seemed to have been fixed by a simple lock and unlock of the ITMX Arm Cavity Baffle (see LHO aLOG 8632), I asked "has anyone ever taken B&K hammer transfer functions of the ACB?" The answer was a resoundingly loud "no" (I am Jack's complete lack of surprise). Me and my big mouth volunteered to do it, and there was a tiny window of opportunity before Thomas cleaned up the chamber, so Thomas and I pioneered the first B&K measurements of the ITM ACB. Details of the measurement setup and execution below.

Again, I don't know how to properly export the data (as indicated in LHO aLOG 8654), so you'll have to be patient regarding the results. Note that obtaining official plots of the results should not in any way be considered as a hold-up for chamber close out.

Of course, after taking the measurements and cleaning up the chamber -- because we *touched* the baffle -- we had Sebastien run a quick set of ISI-ITMX transfer functions, and it informed us we're not-at-all done battling this bumbling oaf of a baffle (see LHO aLOG 8653). This should be considered a hold-up for chamber close out. Round three, first thing tomorrow!

-----------
Details:
We took two distinct measurements: 
(1) With the accelerometer on the suspended baffle itself, using a unused slotted bolt hole in the inside middle, closest to the ITM HR surface. This test was just a shot in the dark, to see if we could get a nice driven transfer function of the suspended stage, since there have been no prior attempts with this generation of the ACB baffle. At first glance from the B&K software plots, it looks like a complete mess, so it will most likely either be a completely confusing / useless or completely depressing result.

DSCN0206.jpg (or pg 3 of the .pdf) shows a picture of the accelerometer from inside the baffle looking out back toward ITMX. As is (hopefully) resolvable in the picture, ACC +X = ITMX -L, ACC +Y = ITMX -T, ACC +Z = ITMX +V. The Y impact was on the (ITMX) +T face, bottom corner, closest to the ITM, in the (ITMX) -T direction. The X impact was along the bottom edge of the (ITMX) -L face, in the +L direction.

(2) With the accelerometer on the bottom of the support structure's tube (shown in DSCN0209.jpg). One can't see it in the picture, but the accelerometers axes were aligned with the global IFO's axes, such that ACC +X = Points down X arm towards ETMX, ACC +Y = Points down the Y Arm towards ETMY, and ACC +Z = Points up with local gravity (the same as ITMX's +V). The X & Y impacts were made towards the bottom of the outer, support structure, "eddy current damping 8 dia," tube (D1002564, of the assembly D1200275). Man, that thing rung like a bell when Thomas whacked it...

The files live on the B&K laptop only, in
C:Users\ligo\Desktop\SUS Hammer Test\ITMX\BandK\
and are called
(1x) SimpleHammerDisplay3-ArmCavityBaffleBaffle-ISIfloating-SuspendedElements_Ximpact.pls
(1y) SimpleHammerDisplay3-ArmCavityBaffleBaffle-ISIfloating-SuspendedElements_Yimpact.pls
(2x) SimpleHammerDisplay3-ArmCavityBaffleBaffle-ISIfloating-StructuralElements_Ximpact.pls
(2y) SimpleHammerDisplay3-ArmCavityBaffleBaffle-ISIfloating-StructuralElements_Yimpact.pls

The TMSX crew are done for the day and have left the suspension in a hopefully good state, so I'm starting Matlab TFs at 16:45.