Jason and I measured the support tube nozzle flange location with respect to the chamber center position.
Measurement was shot to the back side of the flange where it joins the the nozzle tube.
The results are:

Right side angle is 120deg, 34', 12" at a horizontal distance from the total station of 2356mm.
Left side angle is 59deg, 19', 17" at a horizontal distance from the total station of 2354mm.
 Difference is Y- 1.9mm.

HEPI medm screens were updated to the latest version which is covered by ECR E1300816.

The update was performed under WP #4241 which is now closed.

All PSL models stopped running at 12:07 PST with errors of ADC TIMEOUT.  I powered off the computer, then Richard power-cycled the I/O chassis using the power switch on the front of the chassis which appeared to work.  On power up, the computer could still not see more than one card in the I/O chassis.  Powered the computer down again, and Richard completely disconnected the power from the I/O chassis.  On power up, the models restarted normally.

After Fabrice okayed our close-out tests, Hugh and I headed down to the end-station to close out the seismic prep for closing the chamber. Hugh locked HEPI, while I checked cabling and locked the ISI. Other than adding a cover, we should now be ready for the dome.

Existing regulator was working but had a significant leak through its diaphram.  

Mark, Eddy, Tyler and I installed two in-chamber cleaning dust barriers into the south nozzle between BSC3 and BSC2 to provide laser safety in BSC3. The operation went well and was completed before lunch. (Note-I went in first to wipe down the floor and the south bellows convolution. The floor was in good shape as evidenced by the fact that the wipe came away clean except for oxidation. The bellows convolution was not terrible but definitely dirtier than the floor: there were some metal fines and a couple of viton shreds.) 

Randy helped the CPB folks throughout the morning. 

Eddy and Tyler moved a HAM work platform from the east side of HAM1 to HAM2 just before lunch.

The entire crew went down to BSC9 aka ETMX after lunch to work on the dome. There was a bit of a delay while walking plate bolts were removed but the dome was returned to the top of the chamber by the end of the day. I spent some time stowing the tooling etc. that is in the lower level staging area in preparation for moving the cleanroom so that the door can be replaced tomorrow.

Not a bad day's work!

This morning I was unable to use tortise svn to do an svn update on h1ecatx1, jonathan managed to do one using the command line but something is wrong.

Now PLC2 on that machine is giving the message "choose run time system".  I'm not sure why this happened.  I tried stopping the plcs and shut down the OPC powershell window, but when I reran the install scripts I got the same choose run time system message, after which the plc does not run.  So now I am restarting the machine.

I was also trying to use remina on opsws5 to log in to h1ecatx1, now opsws5 is crashed.  Also, earlier today remina crashed on opsws3, and I was not able to use it again on that machine. 

Also, the PSL shut down about an hour ago. 

Started a round of TFs for SRM at gps = 1067655775. Measurement will take ~8h to complete.

Keita asked me this morning to take a look at TMSX damping. I am not sure if it is because it is moving too much, or if it was just to make sure it's working.

In any case, damping looks to be functionning fine.

Attached are some results comparing TMS motion damping on vs damping off in each DOF with the ISI floating (no active control). The first picture shows the time series and the second one the spectra.

Qs are reduced by a factor of (roughly the order of) 100 for the first modes of each dof. The last picture shows the filters engaged and the gains (for future reference)

Joe Gleason, Volker Quetschke

We've reduced the main beam power measured at the bottom periscope mirror to approximately 260mW using the main (second) power control stage. We noticed that the PMC locking was unstable when we entered the PSL and were not able to remedy the issue. The throughput was approximately 80% according to the reflected power. The transmitted power looks to be uncalibrated at the moment and shows only about 1/10th the actual output on the PSL_PMC MEDM screen. Should the throughput change to the usual maximum we will still be under the 300 mW max required for the HAM2 work.

Travis, Betsy

Today, we attached the QUAD pusher and weight-off-loading mover assemblies on the ITMx QUAD and it's ISI.  Attempting to maintain the yaw and Y-direction alignment, we pushed the suspension structure about 6mm.  We then reclamped the QUAD with it's dog clamps and removed the pushers and movers.  Next up:  SEI HEPI Z, and Yaw adjustment, followed by another IAS measurement suite.

Some SUS items were moved from X end to Y End TMS Lab in preparation for dome and doors going back on BSC9 (maybe tomorrow). Some items (iLIGO SEI scissor jacks/blue iron, cables) were moved from Y End to Y Mid. 

A little work was done at Y Mid in preparation for receiving four ISI storage containers from LLO this week. 

The iLIGO baffle was removed from the X Arm Spool and preserved clean. Work on cryopump baffle continued.

Three dust barriers were located (two clean) and moved to the High Bay for in-chamber use. One will need the Viton strip re-attached.

Attached is a plot of the round trip delay times of EPICS PULL (active read) EPICS PUSH (active write) and EPICS PUSH/PULL (active write to 3rd channel, followed by active read from that channel).

PUSH and PUSH/PULL are dominated by a 2Hz update cycle. PULL sees a 8Hz update cycle.

The minimum delay for PUSH is around 110msec, for PULL and PUSH/PULL it is about twice that.

The delay for all three channels is about 10x too slow to be really useful (i.e. for acknowledgment returns shorter than the blink of an eye.)

Betsy, Travis

On Friday, we rebalanced the SRM suspension adding enough weight to the middle mass to bring it down such that the 2 AOSEMs which were maxed out in Z-position could be aligned.  These AOSEM brackets were poorly designed and we have found that many of the HSTSes at LHO (and likely at LLO, but awaiting their response) are built with the brackets at a range extreme.  So, while the SRM passed TFs the other week, we had to start over with balancing in order to bring these AOSEMs into alignment with a little bit of range adjustment.  Previously, the SRM had been balanced to within tolerance at ~0.75mm high.  Friday, we added enough weight to bring it to ~0.25mm low in order to bring the middle mass down a bit.  Note none of the other 12 OSEMs were out of range, just the 2 top ones on the middle mass.  Because of the rebalancing, Phase 2b TFs need to be run and evaluated again.