Tested the forward voltage for the ACB diodes. 
BSC10 Flange F1-3C1 (air side).

Pin 1&2
PD forward voltage: 0.431V


Pin 4&5
PD forward voltage: 0.423V


Pin 7&8
PD forward voltage: 0.431V


Pin 10&11
PD forward voltage: 0.423V

All results within spec.

Margot and I performed all of BSC10 closeout tasks listed in my previous alog regarding this closeout.  We pulled the FC from the ETMy optic a little after 11am, and the door was going on at ~1:30.  It took "so long" (ha) because we ended up having to spend some extra time calling in the troops about one of the ISC viewports having what appeared to be a scratch on it's inside surface.  More details to come as needed.

Jim locked the HAM5 ISI and then we floated the platform on HEPI.  A couple of Spring adjustments and we are level on the Optical Table to +-0.1mm.  Not sure about the elevation yet but it is likely close to Spec.  This will be good enough for continuing the ISI commissioning which we may get started before days end.

Please mind the signs--There are no optics here but HEPI is unlocked & floating; also please mind the Dial Indicators--Thanks--H

ITMY HEPI tripped. Reset.  

I've created a new folder on the desktop for WD trip plots, if operators could help us to plot and post these each time there is a trip it would be greatly appreciated.

You can create the plot by opening the WD screen, before untripping idenify the type of trip by looking for a red box in the First Trig column.  Use the blue buttons labaled Plot ACT trip to make the plots (it will pop up after a while).  Use the magnifying glass in the plot window to zoom the plot to the relevant time scale, then take a screen shot.  You can store this in the WDTrip folder on the desktop, and then post it in the alog. 

Jamie, Fabrice,

I am posting for the records and for discussion the WD trips we observe while tuning the turn on procedure for the guardian.

no restarts reported.

The results are given in the attached pdf file. The atmospheric leak rate is less than
5.5 +-0.6 x 10^-9 torr liters/sec. The hydrogen outgassing rate referred to 23C is
6.0 x 10^-14 torr liters/sec/cm^2 close to the value measured in 2000.

Last night, undamped transfer functions of H1 TMSY were ran (Phase 3a) with the ISI damped. 3 different drive amplitudes were tried to see if cables are not adding non linear effects.

• The first attachement shows the comparison between the three drives

In orange excitation amplitude is 10000, in black drive is 150000, in pink drive is 20000. TF is consistent throughout the drives.

• The second attachement shows how one of this measurement compares to TF taken last year on TMSY, when it was in chamber, under vacuum.

Differences in frequency of resonnances can be seen in the L V R P degrees of freedom:

First roll mode at 0.68Hz splits in three modes 0.68Hz 0.72Hz and 0.79Hz
First Pitch mode at 0.74Hz splits in two modes at 0.72Hz and 0.79Hz
First Vertical mode at 0.69Hz splits in three modes at 0.67Hz 0.72Hz and 0.79Hz
Second Long mode at 0.74Hz (pitch coupling = first pitch mode) splits in two modes at 0.72Hz and 0.79Hz

All differences can certainly be explained by the change of cable routing when moving cartridge from BSC6 to BSC10. (For details on how the current routing looks like see pictures on alog 11021). Since the actuation is working properly, and the suspension still provides passive isolation above the resonnances, it seemed acceptable to move on with installation.

• The third attachement shows how the "first article" measurement (TMSY) is different than "production". This is to check if the damping loops can stay "generic". Since the loops are simple velocity dampers with low Q boost around main resonnances, it's ok.
   
• The last attachement shows how the damping is doing, with a spectra comparing undamped/damped

This morning, SEI, TMS, and SUS gave a cursory "approval" of their systems in order to proceed with chamber close-out tasks.  So, after lunch, Margot and I applied First Contact to the ETMy-HR surface which will be pulled just before closing the door tomorrow.  The order of events this afternoon (and late morning in order to catch the alog up):

Jim locked the ISI and put final touches on chamber feedthru cable routing.

Apollo+Joe+Gerardo had a viewport party at the BSC10/6 area.

Margot and I locked the lowest masses of the ETMy QUAD.  Then we,

Secured the ACB locking bracket and used the wedge to swing it back and prop it into place.  See notes on this in attached alog.

Attached the FC QUAD cone to the structure and sprayed FC (standard 3 coats) on the HR surface.

Removed the cone from the suspension.  Finished FC layer reinforcement.

Removed the wedge from the ACB and restored it's nominal hanging position. Removed the ACB locking bracket screws.

Started stowing all left over bags of "junk" left outside of the chamber door on various table surfaces by SUS and every other team that visited this last month.  If you're missing something (and you noticed), I took ownership of it.

Jim arrived and unlocked the ISI.  The ETMy QUAD will remain locked during dome replacement.

Apollo started gearing up to remove walking plates from upstairs and crane the dome on the chamber.

Tomorrow's to-do list which Margot and I will do until the last step:

Inspect insides of viewports.

Adjust ACB to check magnet gap which may or may not have shifted slightly due to the swing back from today.

Clean the chamber, vacuum, etc.

Take final PCL swipes.

Blow various other optic surfaces.  Or not.

Swap in final 1" witness optic on QUAD structure.

Check/Remove all tools.

Remove ETMy-HR with N2 blow.

Set and lock all 64 QUAD EQ stops and nuts, accounting for buoyancy.

Set QUAD BOSEMs to account for buoyancy.

Quick QUAD health check with DTT TFs.

Lay final witness plates.

Exit chamber.

Finish stowing everything around door and move it out of the way.

Put door on.

Here is an update on the instruction for untripping seismic, with some new tips from Fabrice, especially for ETMX. 

Untrip HEPI WD, use Commands2 window to isolate level 1 on all chambers except BS which is level2

Untrip ISI WD (you may need to raise T240 Threshold)

reset CPS offsets,

• go into stage 1 bias screen hit reset CPS offsets, then hit store targets.  
• Repeat in stage 2 bias screen. 

Check that everything is in high gain: (this is also good to check if you are already isolated but have a lot of motion)

• Click on the three T240 screens, check that the filter modules labeled gain are ON
• In the L4C screen check that the filter modules labeled gain are OFF
• in the GS13 screen check that the filter modules labeled gain are OFF

If you have been struggling with switching the blend filters, you may want to zero the T240s.  You can do this in the three T240 screens by tuning on the AutoZ filter module in the X filter module, then turning it off.  

Use commands, isolate level 3 for most chambers. For ETMX start with Commands, Isolate Stage 1 Level 2.  Once this script is finished, isolate stage 2 level 3.  

Switch Blends:

• Go to stage 2 bleds switch all to Tcrappy.   If this failed you can 1st switch Z from Start to Tcrappy, once it has switched RY, RZ, RX, Y, and X.
• Wait a long time......until the T240s are have hundreds of counts. 
• Repeat for stage 2.
• There is a switch all button, that might save you from having to do one at a time, but can often trip the ISIs.   

good luck...

Aidan, Dave H, Thomas

More cabling and plumbing.  The leaky laser from ALOG 11019 was replaced with a new one and a matching RF driver. We're in a position to be able to turn on the laser mid-morning tomorrow.

The new ITMx monolithic welding has been successfully completed and was left suspended overnight last night.  The majority of the modal measurements have also been completed today, with the exception of the violin modes, which are proving to be trickier to measure than in previous suspensions.  We will continue with these measurements tomorrow with some different equipment.  Stay tuned for subsequent posts with IAS and modal measurement numbers.