The ISI is uncovered and unlocked.
The HEPI is also unlocked.

As I noted in log 1989, we completed the attachment of the HEPI Actuators to the Suspended Structure Friday and made some corrections with the DSCW Springs to bring the dial indicators back to Aligned position.  We've managed to do this, mostly.
My current assessment of where I've moved the Cartridge is 3mils up, 10mils West, 12mils South, and 170urad CC from above.  According to IAS final numbers, this change, if my estimate is accurate, should not move the ITMY out of tolerable position.

We currently should be about:
120urad cc from ideal &
0.65mm South
0.7mm West
0.5mm High

Of course after the ACB goes in all these numbers will be revisited by IAS and we'll be happy to further dial it in.  The connection of the Actuator to the Suspension does complicate the moving and we may need to again disconnect the actuators from the Suspension if the move is excessive.  Alright, only 21 HEPI systems to go!

EricA & Hugh

We made tweaks to the Actuator Mounting and the Bellows shield to give us maximum available range.
There is one actuator-Vertical Pier1(NE) the range of which is just 0.045" in one direction.  All others are 50mils or above.

EricA & Hugh

Table legs were grouted into place today, with help from Robert and Anamaria. Fans are running on top of the legs and drying out the hydrostone.

Additionally, table cleaning is making good progress. Christina and Terisha are in the final stages, blowing dust out of the tapped holes and vacuuming it up.

Rai may want to open GV18 during his visit this week.

The H2 mirror was cleaned this morning in the OSB optics lab.  The pictures show just a few of the steps involved.  The mirror is heading to the LSB optics lab to bake in the optics air-bake oven until Friday.

- Cheryl, Greg, Thomas, Joe

Repaired dust monitors were put in the LVEA in the "Beer Garden"  (H0:PEM-LVEA_DST5) and near the previous location of the H2 electronics racks (H0:PEM-LVEA_DST7). One was also put in the OSB bake oven room (H0:PEM-LAB_DST3).

The latest SUS QUAD build in the Staging Building is designated "QUAD 03 BUILD 03" in the SVN directory.  All data should be saved in the "/ligo/svncommon/SusSVN/sus/trunk/QUAD/X1/QUAD03/BUILD03/" directory.

J^3 (Bartlett, Garcia, Kissel), A. Ramirez

Jeff and I grabbed the first set of transfer functions from X1 SUS QUAD03 after Jeff and Andres have brought it up-to-date with retrofits.  Note, that this is the "first brush" suite -- These are taken before reaction chain cables are installed, to ensure the dynamics are expected.

The results are attached. I've compared these measurements against the three other ETM-flavor QUADs we've build across the project,
X2SUSQUAD13 @ LLO
X2SUSQUAD14 @ LLO
X1SUSQUAD04 @ LHO (soon to be H2SUSETMY) 
Not that in this latest round of measurements, the OSEM Open Light Current has not been normalized, so the ~25% discrepancy in overall DC amplitude of the transfer functions (for example R0 V and R) should be attributed mostly to uncompensated variation in sensitivity of the OSEM sensors.

The results look great; I approve the suspension to go onto installing reaction chain cables. I've left the suspension with damping loops on and running. 

If I were to be picky, the only thing that I've found that raises a yellow flag, which we should keep an eye on in future measurements: Reaction Chain Lowest Pitch mode is high, but no other pitch dynamics appear to be effected.

As a side note, now that we've got more statistics on ETM-style QUADs -- it looks like there's a good deal of excess cross-coupling in the measurements of X1SUSQUAD13, and the other SUS's show that we can build these with much less. We should keep an eye on this when we move to retro-fit/upgrade/add cables.


Data Taken from DTT files here:
/ligo/svncommon/SusSVN/sus/trunk/QUAD/X1/QUAD03/BUILD03/
SAGM0/Data/2012-01-06_X1SUSQUAD03_BUILD03_M0-*-WhiteNoise_TF.xml
SAGR0/Data/2012-01-06_X1SUSQUAD03_BUILD03_R0-*-WhiteNoise_TF.xml
and exported to .txt in F1F2F3LFRTSD LTVRPY order to .txt files of similar name as above (with "_tf" tag).

Data initially processed by:
/ligo/svncommon/SusSVN/sus/trunk/QUAD/Common/MatlabTools/plotquad_dtttfs.m

Data compared with others with:
/ligo/svncommon/SusSVN/sus/trunk/QUAD/Common/MatlabTools/plotallquad_dtttfs.m

Before closing the doors on the HAM-ISI in the staging building (assembly 1), we measured ASDs of the instruments. The horizontal GS13 in corner 3 (POD SN68 – GS13 SN805) had a bad response at low frequency (see spectra) which is a typical characteristic of a stuck proof mass.

After opening the vacuum pod, we verified that:

-         The kinetic feet could not move and the cross bar was not loose.

-         We could feel the mass moving when the geophone was tilted

-         The mass is centered when the geophone is horizontal (Level on the second circle)

We measured a spectrum while making sure the geophone was horizontal and the proof mass was centered. The spectrum still looks bad.

After taking apart the geophone, we could feel that the mass is not moving freely (sticky). We will replace this geophone with a new one.

(Corey, Eric, Jim, Mitch, Vincent)

The first part of the day was devoted to getting some "before" measurements on the BSC8ISI; that is, before the Vibration Aborbers were installed.  Unfortunately, it sounded like clean measurements couldn't be made for both Stages (Sensors were saturating on the system [most likely due to nearby loud hammering/drilling]).  Because of this, we were only able to do work on Stage1. 

The Stage1 Vibration Absorbers are to be installed on the Outer Walls/Doors of the Trillium & Horiz L4C area.  It was quickly discovered that we could not install the Vibration Absorbers.  This is because there are a pair of dowel pins (for masses) which are exactly within the bolt pattern for the Vibration Absorber (!). 

So, we decided we'd hammer out the pairs of 1/2" dowel pins on the three doors (that's a total of 6 which needed to be pressed out).  And we obviously didn't have the equipment to do this, so we MacGyvered tools with what we had (a big mass for a hammer and an allen wrench as a punch).  To hammer these pins out, we had to completely remove all three doors which entails removal of lots of bolts, removal of mass from doors, powering down the equipment at the SEI rack, disconnecting cables from the Trillium and L4C, and then carefully taking out these doors to a work table for pin removal. 

The doors were eventually re-installed (not torqued), the ISI was covered, and left in that state overnight. 

This morning the crew is already set for starting the work we intended to start last night.

We're running transfer functions over night of both ITMY and FMY top stages, hopefully it doesn't crash.

cdsimac0 cannot put in excitations through Matlab
I did not have the patience to investigate, so I logged into cdsws5 and am running them there "remotely".

The 3 line script calling the three items to run (ITMY M0, R0 and FMY M1) is in SusSVN/sus/trunk/Common/MaltabTools/SchroederPhaseTools/. That will give you the info on which scripts are used, all committed to svn.

For future reference, the BSC-ISI is locked and possibly in a funky position.

Attached are plots of dust counts > .5 microns. High levels of dust in the LVEA.

After Friday's FMY damping loop sign changes, further investigation indicated the *M1_COILOUTF_*" actuation gains were flipped for each OSEM Coil. This was most likely caused by an outdated burt restore file used after the front-end reboots performed the previous day. This resulted in the damping loop gains needing a positive sign for signal damping.  The signs on the *M1_COILOUTF_*" gains are now flipped from Friday's values.  The FMY M1 damping loops now have all negative gains and have been closed successfully.

FMY M1 COILOUTF_*
01/06/2012 before changes          01/09/2012 after changes
F1 = 1                                           F1 = -1
F2 = 1                                           F2 = -1
F3 = -1                                          F3 = 1
LF = 1                                           LF = -1
RT = -1                                          RT = 1
SD = -1                                          SD = 1

A new burt snapshot file was taken for this state to prevent this issue, located here:
"/opt/rtcds/lho/h2/cds_user_apps/release/sus/h2/burtfiles/fmy/h2susfmy_20120109_new_gains.snap"

With the concern expressed by the AOS/SLC/ACB crew, I thought it reasonable to look at the level of the Solid Stack Panel(SSP) to which the ACB is bolted.  The components of the ACB cover most of the panel but there is a few inches available at the East end and just a couple at the West end.  The SSP is ~10" wide (N-S) and 30" long (E-W).  Our 'as-built' measurements using the Sokkia Optical Auto Level put the SW corner of the SSP 0.9mm lower than the opposite NE corner.  The other corners, NW & SE, were within .2mm of each other:
Start level wrt average:
NW  0.0mm
SW  -.5
SE  +.2
NE  +.4

0.9mm/30"(762mm)==1.2mrad.  For some reason out on the floor I calculated about 3x this...not sure what I did.  Anywho...Lisa said the requirement was 0.14degrees or 2.44mrad so we were already there.  Still given my miscalculation earlier we made it even better.  We loosened the bolts holding the SW corner of the SSP to the I-Beam on which it sits.  This allowed that corner to lift up.  I then slipped a pseudo ClassB 20mil shim between the SSP and the I-Beam and re-tightened the bolt.  Despite the 20mils, this only improved things a little with other things playing into the game.  The West side to East side tilt only improved to 0.7mm but that is of course well within the 0.14degree spec.

Final level wrt average:
NW  -.3mm
SW  -.3
SE  +.4
NE  +.3

Attached are plots of dust counts > .5 microns. Very high levels of dust in the LVEA (H0:PEM-LVEA_DST11_5). High levels of dust in the optics lab (H0:PEM-LAB_DST1_5). Some dust in the clean room over BSC8 (H0:PEM-LVEA_DST15_5).

EricA CoreyG HughR

On Wednesday we started this process of connecting the Actuators to the Crossbeam (Foot).  We completed this yesterday long with 130lbs on extra weight on the West Crossbeam to mimic the ACB.  We then released the HEPI suspension and then made adjustments to the big HEPI Springs to bring the dial indicators back to pre-disturbed position.  We got pretty close to this but there remains some differences.  I'm confident we remain in tolerance for the translational position but the Yaw may need tweaking.
Today we made gap checks of the HEPI Actuator actuator-plate/bellows shield.  This is our motion limit and we need to insure it remains centered.  We've made some adjustments of the Actuator positions to improve this centering.  We still need to do a couple more.

We also ended the day yesterday with a stuck L4-C (Horizontal NW(Pier2)) but Eric pulled that out and gingerly freed it.  It has been reinstalled.

Table legs were set into place and leveled. On Monday the table legs will be grouted into place.