[Corey, Hugh, Scott]

In a continued effort to figure out the Support Tube/V-block discrepancy noticed between H1 & H2, Scott and I tried a couple more measurements (vs the Air Bearing/Air Bearing measurement we made Fri).  On Friday, we determined that the distance between Crossbeams is the roughly the same for H1 & H2, BUT visually it looks like the Support Tubes appear to be different lengths between H1 & H2 (on H2, the Support Tubes look smaller and instead of being flush with the V-Block, they are inside the V-Blocks.

Today, we removed the Accelerometer plates of a few H2 Support Tubes, hung plumb bobs off the end of the Support Tubes, made a mark on the floor and then measured the length of the Support Tubes via these floor marks.  This was also done on H1 (it was noticeably harder because of all the cables and cable trays).

Aiming to have an accuracy within 1/16th, here are the results from the random chambers we looked at:

• HAM7 west Support Tube:  93 1/8"
• HAM7 east Support Tube:  93 3/16"
• HAM8 west Support Tube:  93 3/16"
• HAM8 east Support Tube:  93 1/16"
• HAM2 west Support Tube:  94"
• HAM2 east Support Tube:  94 1/16"

Now as a comparison, the drawing for the Support Tube (D972610) shows a Support Tube length distance of 93.190" (~93 3/16").  So, it appears our H1 Support Tubes are longer (whatever that means....beause H1 Support Tube/V-block connections look better).

It appears the extra distance is all in the "nose".  We made a measurement from the outboard surface of the Bellows out to the end of the Support Tube, and we could see an obvious length distance here.  For the H2 Support Tubes, this distance is ~3 19/32" and for H1 this distance was ~4 3/32".

Notes on attached photos:

Photo#1:  The "inboard" H2 Support Tube in its V-Block (at HAM7)

Photo#2:  The "flush" H1 Support Tube in its V-Block (at HAM6)

Valved-in IP1, 2, 3, and 4*Valved-out Vertex MTP

Oscar was bailing tumbleweeds
Work was done on the automatic raising and lowering of the clean room over HAM6
Dani took Greg, Mark and Bram on a laser safety tour of the LVEA
The H1 PSL was turned on for the squeezer experiment

SUS finished the installation (swapping out defective OSEM and rebuilding the flag mounts on the Top Mass) of the OSEMs in the FM Top mass and Penultimate mass. All ten OSEMs in FM1 have been aligned, centered, and zeroed. Mark B. is starting the testing cycle

[Corey, Scott]

Hugh noticed some discrepencies between how the ends of the HAM Support Tubes looked with respect to the V-Blocks (basically, all the H2 ones looked inboard everywhere, and H1 looked better).  Scott and I went around to each chamber and took a measure of the distance between bolt holes on the top of the airbearings (to get an idea of the crossbeam/crossbeam distance for  each HAM chamber). 

Below, shows the measurements we made between Air Bearings.  Took linear measurement between Air Bearings (i.e. inline with the Support Tubes).  Overall, the measurement looks similar.  So, the notable issue is why the Support Tubes on H2 are all in-board of the V-blocks.  Are these Support Tubes smaller??

(*Didn't make measurements for HAM6 since there was a suspended Clean Room over it)

Highlights:
- Hanford Fire Department work.
- Problems with chiller fans, temperature anomalies across the site.
- HAM10 staging.
- Laser Hazard -> Squeezer work at the PSL table -> Laser Safe.

[Bubba, Corey, Hugh, Nicole, Scott]

After surveying work yesterday (level of the Support Tubes), we leveled up the Support Tubes via the Scissors Tables.  Once this work was done, we pulled out the Support Table so Jodi could go in and do some fit checks for cleaning work.  The Support Table is still out, and will hopefully get re-installed on Fri.

Restored YBM to nominal status.  Also, valved-out XBM MTP and valved-in IP6

BS/FM 1 fully assembled. BOSEMs installed on Top Mass and PenRe. Full/No Light counts completed for Top Mass BOSEMs, and flags have been centered at 50%. PenRe BOSEM Light Counts will be completed today and then the flags will be centered. BS/FM 1 will be ready for testing and TF by the end of the day. Working with Rai Weiss to determine secondary prism location on FM Dummy Test Mass.

CP1 and CP2 may alarm during the night if the outside temperature drops too low for too long (ongoing issue with moisture in actuators freezing).  I will monitor from home.  Permanent fix pending time availability.

No major work done today

FMCS was down, I restarted it by running the fmcs.pl script on h0tempmon - the wiki says this is supposed to run on h0vacman, but that computer is not connected to the network.

Highlights (times in PST):
09:19 - Hanford Fire Department done at MX
09:35 - MX alarm system is back online
09:53 - Praxair leaves
10:00 - UniFirst arrives
10:10 - Door forced at Fiber Lab, Doug informed, could be Richard/HFD working on something
10:35 - Sewage maintenance arrives
10:51 - Staging for putting anchor bolts at HAM12
13:49 - HFD returns
13:51 - Jodi sends crew to clean chamber at MX

Rai Weiss will be giving an introductory LIGO talk on Thursday at 1:00 PM in the LSB auditorium.  All are invited.

[Chris, Corey, Greg, Rodney, Zak]

The BSC4 SEI System was disassembled, put on pallets, and rolled out of the LVEA (Down Tube will be cut so the Support Table can be used), and eventually will be rolled outside to await recycling.

Entered BSC4 via HAM10 to check on accesibility of lower Support Tube bolts to "vertically challeneged".  It's possible to reach the bolts, but it's a little bit of a stretch.  (the use of Jim may need to be entered into the De-Install procedure)

The Dome was re-installed on BSC4 with no issues.

This completes removal of H2 iLIGO in-vacuum Seismic Isolation systems from the LVEA (except for the HAM Support Tables...they'll stay in until after HEPI installation).

[Chris, Corey, Dave, Jim, Mark, Nicole, Randy, Rodney, Steve, Zak]

After a late morning start, we commenced taking the BSC4 Dome at around 10:30am, and finished this around 11:40.  After lunch, on O2 sensor reading was taken of the BSC4 chamber, Jim accessed the chamber via HAM10 (Zak & I acted as "spotters" to keep an eye on him while he was in a non-permit confined space), Jim disconnedted the Support Tube Bolts & the cabling from inside the chamber.  Platforms were then installed and the Seismic Stack was pulled out from the chamber and laid down near the Large Roll-Up door.  The Down Tube was rotated and laid down on the top of the Optics Table (we can de-stack this assembly tomorrow).  Note:  8' straps don't allow for easy twisting of the Down Tube.

The other theater of SEI work in the LVEA was the cutting of the BSC8 Down Tube.  The Down Tube was cut so the Support Table could be pulled out.  The Support Table will be used as a hard fixture to maintain Support Tube rotation and position for the Mid-Station Chambers that get moved to the End Stations.  (photos of the hacked Down Tube are attached)

Received 12:30 phone call notifying monthly testing of Hanford alarms.
Hanford fire department was performing regularly scheduled maintenance at the outbuildings.
BSC4 Passive ISI stack was removed. The dome will be replaced and the stack disassembled tomorrow.
Oscar was bailing tumbleweeds.
There was an oil drum delivery for Hugh.
The metal recycling was picked up.
h0epics2 was restarted, and the motor controllers running on h0epics1 were moved over.
I had to restart dust monitor locations 3 (BSC4) and 6 (Diode Room). Location 1 (ISCT4) still needs to be restarted. They had been on hold for an unknown period of time.
There is an unresolved problem with the central control for FMCS.

I borrowed a gray tripod post which was sitting at the entrance of the LVEA.
It is in the squeezing area right now and there is a beam profiler sitting on top of it. It would be great if we could keep both the tripod and the beam profiler in the sqz area for a few days next week.
If it is a problem, let me know.