As IAS told us last night we were 0.4mm South, we disconnected the Vertical Actuators and then based on the Dial Indicators moved a total of ~1/2mm North.  After this, IAS told us we were 0.9mm too far North...What gives?

Jason checked his numbers and confirmed.  We moved the HEPI back South ~1mm and now IAS says we are 0.03mm South.

So now the ACB is being aligned--when they are done, SEI will change/add Viton to vibration absorbers.

Bland, Sadecki
Yesterday, we worked towards attaching the lower reaction chain to the full QUAD.  We:

- Moved it to the 5-axis scissor lift
- Rerouted and secured the cables on this portion of the chain
- Maneuvered it under the ISI next to the main chain
- Pulled the FirstContact on the ERM HR surface (blew with filtered N2 and drag wiped residual ring around the edge near the ID of the gold coating)
- Pulled the FirstContact from the ETMy AR - found that there was sever streaking on the mass under the FC at the top 3 inches of the sheeting, as well as a smear of FC on centerline, right 3". <- Awww, game over.
- Repainted on new FC sheet with PEEK tab.
- Left it overnight to dry since it was so late in the day.

So, unfortunately we could not get the chain attached due to the FC process.

Photo shows that all racks other than the fibre opitcs patch rack have been removed from the MSR and the UPS rack is disconnected from the power circuits at the moment. Underfloor power upgrades are complete. We are still pulling out the old underfloor CDS cabling, carefully while maintaining active systems. A new cable tray has been installed under the floor which cuts across the centre of the main loop. Underfloor drawing is available on DCC 

<A HREF="https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=78581"> Link to D1200078</A>

Betsy, Richard, JeffG, Anamaria

ETMY now has an iMac work station near the clean room.

The electronics chain will hopefully be closed tomorrow, once the feedthrough has been cleaned (to my knowledge the last piece missing).

The models are running on the front end, h2susetmy. We've loaded the filters and epics values necessary (using the load_medm_values and prepare scripts in SusSVN), so it *should* all be ok. In order to fix previously mentioned issues of sign flip and dc gain, we've entered dumb OSEM input filters by hand as a simple zero at 10 Hz and pole at 4 Hz. When the scripts are fixed, we will rerun them to get in whatever filters we decide on. We also copied over the damping filters from ITMY, by hand. Had to change some filter bank gains to match production electronics.

Saved a burt file with today's date in /opt/rtcds/lho/h2/userapps/release/sus/h2/burtfiles/etmy/ and committed it to svn. Just in case. 

Attached are plots of dust counts > .5 microns.

IAS told us we were 1.1mm too South.  I decided this was too far and too unpredictable to move with the Horizontal Actuators attached.  So, we detached them.  The Vertical Actuators are still connected although I want to disconnect/reconnect to relieve stress.

We then cranked the HEPI North ~1mm based on the Dial Indicators.  IAS checked again and said we were now in spec and just 0.4mm South.  I asked Jason about this discrepancy and he corrected his early number to being 1.4mm South.

For the life of me I didn't think I had moved things that far since our alignment back on Dec 21.

Early, Jim & I checked the elevation and level of the ISI Optical Table.  It is just 0.2mm low and shows <0.3mm variation in level.

We swapped the AOSEM with the broken PD.  The S/Ns of the 4 AOSEMs are now:

UL 473
UR 332
LL 428
LR 321

(Corey, Mark, Slim, Zach)

With the Payload extraction from last week, and starting first thing this morning, we were able to empty HAM4 & HAM5, and remove a few more items from BSC2. Today's work occurred roughly from 8:15-11:30 (with a 20min break at 10am after the SEI stack was removed).  All photos for this work is located in Resource Space, here.  This signifies the last removal of an iLIGO HAM SEI from a chamber.  A breakdown of today's activity is below:

HAM4

Removed SEI system (kept Support Table in Chamber).  The Optics Table and Leg Elements were wrapped & bagged.

Note:  Zach found a loose 1/4-20 bolt inside the Optics Table.  This either dropped down there during Payload extract on Fri, or it has been along for a ride for the last few years (and Science Runs).

HAM5

Removed HAM5 Baffle (this will be scrapped for recycling)

BSC2 (& BSC1, BSC3)

Removed (4) Cornucopia Beam Dumps (black glass should be removed off of these guys, and rest tossed for recycling)

Removed (18) Side bolts from the Support Tubes (this is to prevent the need to have someone go into the chamber for BSC SEI extract later).

Removed forgotten allen wrench

Put H1 ITMx & ITMy Suspensions on their stops.

aLIGO HAM 2 has had the old iLIGO stacks removed and replaced with fancy new HEPI piers, frames, and crossbeams. The support tube positions will be checked and fine tuned within the week. Hopefully work can begin on removing the iLIGO HAM 3 stacks and installing the new HEPI structures soon.

A new version of awgstream has been installed for Ubuntu workstations which corrects a bug in which not all channel names are read from the nds.  New version is 2.15.5. 

While working on the ETMy today, we also found that one of the 4 PUM flags had a failed glue joint, and one of the PenRe AOSEMs has a broken PD filter.  We reglued the flag and set the heat lamp for overnight.  We'll need to get a replacement AOSEM to swap with the one with the broken filter.

J. Oberling, B. Bland, T. Sadecki

Betsy noted that a cable was rubbing on the side of the LSAT and that this cable was influencing pitch.  She corrected this and I measured the ERM pitch in the single, double and triple hang configurations:

• Single hang pitch: 6.08 mrad down
• Double hang pitch: 6.984 mrad down
• Triple hang pitch: 10.01 mrad down

Betsy then put the reaction chain in the double hang configuration and adjusted the pitch to 1.21 mrad down.  I then measured the ERM triple hang pitch again:

• Triple hang pitch: 2.6 mrad down

This was deemed acceptable for ERM pitch adjustments on the LSAT.

Travis made adjustments to the main chain to lower the ETMy in the quad assembly, then I measured the ETMy roll and vertical position.  Roll is reported as the vertical distance from the ETMy horizontal centerline (measured with an optical level and a scale attached to a carbon fiber rod hanging from the ISI optics table) and vertical position was measured as done on 1-13-2012.

• Roll: 0.65mm Clockwise
• Vertical Position: 0.63mm high

JimW, ScottS, Hugh

See the attached which is a zoom in of D0900894 sht2.  The upper right cloud area is the SW corner of the SEI ISI Stage0(+Y,-X) looking up.

We tapped and helicoiled the three holes in the right cloud and one of the 'A' holes in the left (not exactly sure which) to accommodate the planned mounting of the ACB dog clamp and alignment pushers.  These holes were vent holes and were never planned to be tapped.  We were lucky in that they were close enough in size to only lose maybe 25% of the thread holding in the aluminum--plenty fine for the 200lb ACB.
The story is this clamp and these pushers can be removed as there is another clamp on the mounting plate.  And we could swap out the hardware later with vented bolts.

Attached are plots of dust counts > .5 microns.

We uninstalled everything on HAM4.

The followings were bagged and labeled for later reuse for aLIGO itself as well as aLIGO related researches at here and elsewhere:

• AS path steering mirrors and periscope
• POB path steering mirrors and periscope
• POX path steering mirrors and periscope
• Squeezing path steering mirrors
• First article aLIGO Faraday
• H2 iLIGO Faraday which was used as H1 SQZ faraday
• Black glass beam dumps

These are all stored in plastic bins and are temporarily put in the ALS/SQZ work area.

There was a mirror-like thing mounted on one of the side viewports from inside. What is this? It was bagged, but if there's no taker I'll throw it away.

The beam reducing telescopes were roughly wrapped with foils and left in the clean room. Store them wherever you want.

All counter balance masses will go to the recycle bin.

HAM5 baffles was not removed this time.

Corey will post pictures, Sheila will notify Carolyn which iLIGO parts are kept.

Today, when we stuffed the ERM mass into the ETMy lower suspension, we noticed that one of the 5 pins had been somewhat dislodged from it's soldering pool on the gold tab.  Gerardo and Margot believe that this is from the "flipping fixture" which is used to handle the mass.  The fixture apparently sits across some or all of these solder joints.  In the picture attached, the pin is the one towards the 4th one from the right.  
Long story short, Margot thinks we need to revisit the soldering of this pin. 
...to be continued.

For the record, following are the measured weights of the QUAD glass penultimate masses (PUM) and test masses that are currently here at LHO.  Most of this data can also be found on the CIT optics Nebula we page.  Note the labels of the masses are slightly confusing as the optics have been coated specifically for the one-arm.

MASS     LABEL              INSTALL LOCATION
39,653g ETM02 (TM)    BSC8 ITMy
Didn't measure ITMy PUM because it was the first mass bonded and we were not wise to the need for weights.
39,626g ETM04 (PUM) BSC6 ITMy PUM
39,689g D050421-001 BSC6 ETMy PUM (was lasti mass)
39,613g ETM04 (PUM) 
39,641g ETM05 (PUM)
39,633g ITM01 (PUM)
39,621g ETM03 (PUM)