Throughout the day:
 - Work on BSC8 clean room and preparation for in-chamber cleaning

9:15 – 10:15 - Gregorio and crew at Mid-Y

9:30-9:45 – construction contractors on-site

2:15 – Grant out to LVEA

~4:00 – Squeezers out to LVEA

B. Bland, J. Kissel

After a heroic amount of guess and slow checking, we've got a reaction chain that I would deem passable to add cable lacings. The only RED FLAG left from yesterday's measurement suite is that the 5 Hz Roll mode still couples into the Vertical Transfer function; but by "half as much." Take a look at pg 3 of the attached. I'd reduce this to a yellow flag, and say go on to cabling up reaction chain. More details / better summary / M0 results (which also look clean from first glance at measurements) to come.

After more cries from tester guru, I went in and assessed alignment again.  Things checked:

UIM Blade ECDs - not touching.
All Blade tip screws - not touching heads, or tips.
R0 Side BOSEM - still crooked, so,

I looked over the squareness of the tablecloth - it was a bit out of shape based on the relative planes of the ECD faces to the plane of the table cloth plates.  So, a bit of knocking around the table cloth, another round of all 12 BOSEM realignment, and it looks more square to me, with the R0 side BOSEM less crooked.  I am running a round of diagonalization, but with no luck - not sure the drives are working or something...

After twenty four hours, the closed system remains at 100psi--see attached image.

A few other images to remind staff:

The second image shows the west side of BSC8.  There are supply and return lines running to distribution manifolds which step the tube down from 1" to 1/2".  Two 1/2" supply and two 1/2" return lines run over toward and up each pier for the horizontal and vertical Actuators located in the HEPI Housing at the top of each pier.  This is all duplicated on the East side of the BSC.
The next image zooms in; the pressure gauge and the purge valve horizontally opposite will be exchanged for Supply and Return pressure sensors.  These will be used for Pump Station Servo control.
Image 4 (007) shows the 1/2" lines running up close to the BSC to were it turns to connect to the four-way valve at the top of the SEI Pier.  This is were the system transitions to the flex hose connected to the HEPI Actuators.  The four-way valve also allows the main system to be run in recirculation mode while the Actuator remains isolated.

***The system is now in recirculation mode and must NOT be changed***
We will keep the system in recirculation mode for several weeks while we flush and bleed the new plumbing.
***Again--do NOT operate the HEPI Four-way valves***

Going toward the Mezzinine from BSC8, there is a pair of drain valves just East of HAM4--see image 5.  Again, please don't exercise these valves if you don't want to dump HEPI fluid on the floor.

OK, I'll let you go with the last shot.  These are the valves just entering the LVEA where we'll be able to disconnect the temporary plumbing to remove it for the full build.  There are also drain valves at the bottom of this expansion bite.

(Corey, Eric, Jim)   :::   Work from Tuesday 8/9/11   :::

ASSY#2

GS-13 SWAP

Today we received the word to swap out our non-vacuum-worthy GS-13s for good (vacuum-ready) ones we received from LLO yesterday.  So, this required us to disconnect some cables, remove some weights from doors, remove doors, and then remove the old GS-13s.  Before installing the new GS13s we ended up reaming out the undersized 3/8" dowel pin holes on all of the new GS13s.  Then the GS13's were installed.  Overall, the time required for this swap was roughly (5)hrs with two people.  Can't get much faster than that since we only have one forklift for the Verticals, and only one set of "tooling" (teflon blocks) for the Horizontals.  Here are the serial numbers and locations of new GS13s:

corner1:

• horiz-- s/n 095
• vert-- s/n100

corner2:

• horiz--s/n 101
• vert--s/n 075

corner3:

• horiz--s/n 083
• vert--s/n 102

Trillium bolts installed

Recieved the correct Class-A 3" long 1/4-20 bolts for our trilliums.  So, cables disconnected, weights & doors removed, and then the correct bolts were installed and re-installed everything.  We couldn't get a torque wrench on the rear-right bolt, so we torqued this by hand.

Actuator Wiring

After we wired up the Actuators, it was discovered that we wired the Fine ones correctly and the Coarse ones incorrectly (in the medm-world, the sign was opposite to desired motion).  So, Jim went in and reversed the wiring for the Coarse Actuators (see photos).

ASSY #3

Majority of Optics Table holes are helicoiled (Eric did the job of finishing this table off!).  (there are probably less than a dozen 3/8" holes and then a few 1/4" Spring Hatch holes remaining).  Of course, now we have lots of helicoil tangs to break off.

In the in-air oven in the bonding lab, until Thursday, Aug 11 @ 4pm

After an hour of me perusing over the reaction chain for something else gross in it's mechanics, I came up empty handed.  I went ahead and adjusted the PenRe AOSEMs correcting for the adjustments I made late last week while the Top Mass wire clamps was mis-seated.  I centered up the AOSEMs nicely on the PEN flags, recovering much vertical range.  I doubt something was rubbing there, but you know...

Andres joined me a bit ago and also came up empty handed in a search for something out of place on R0.  Pictures of R0 things to follow for the curious.

Discovered a low pressure alarm on the Corner Station purge air compressor (again) during pre-vent inspection (YBM).  As before, the left drying tower air valve which exhausts regeneration air into the room was stuck open (or failed to close).  This had happened a week or two ago and I had manualy stroked it closed.  This "fix" had worked until now.  ->  This type of valve has an adjustment for the closing stroke and a second adjustment for the opening stroke.  Inspection revealed that the nut used to lock the adjusting screw for the close stroke was missing.  Without this nut the adjusting screw was free to back itself out to the point that the valve never actually closed. -> I couldn't find the missing nut but adjusted the screw to the proper stroke and then used a generic hardware type nut to lock it (original nut was blind and had an O-ring to eliminate air loss around the adjusting screw).  I also replaced the muffler (much quieter now) -> System working again.

For whatever reason (forensics yet to take place) the F2 M0 BOSEM died around the power outage event last week (would be great if someone wanted to trend and append).  I'm swapping s/n 638 with 261.  261 was plugged in and reading OLV H2:SUS-ITMY_M0_OSEMINF_F2_OUTMON (in the dim room) of -6337, with H2:SUS-ITMY_M0_OSEMINF_F2_INMON reading 22899.  The dark light OLV (occulted by flag) is 31879.  OSEM input filters all enabled (nominal).  Set to 50% at 4:10 pt.

Kyle, Gerardo 

More finishing work today on the chiller and diode rooms, and will continue on tomorrow. Thursday and Friday should be painting.

J. Kissel, P. Fritschel

After the assembly team discovered a poorly clamped blade spring tip, I've run and processed another suite of TOP to TOP measurements. Attached are the results. I notice the following:
- The frequency of the second Pitch Mode (see page 5 of "allquads") has been successfully moved up, to be near where the rest of the known QUADs resonances are. GREEN FLAG.
- The Longitudinal, Transverse, and Yaw degrees of freedom appear free and clear, very similar to the rest of the QUADs (see pages 1 2 and 6 of "allquads"). GREEN FLAG.
- The DC magnitude of the Vertical, Roll, and Pitch transfer functions is about a factor of two to low compare with the other measurements, calibrated in a consistent manner (see pages 3 4 and 5 of "allquads"). YELLOW FLAG
- Where the vertical transfer function should only show three resonances at (0.55, 2.2, and 3.5 Hz), there's a whopping 4th one at high frequency at a cross-coupled roll frequency (5 Hz) (see pages 3 of "allquads", in addition to pg 4 of "h2susitmy"). RED FLAG
- In the Roll Drive to LF and RT response transfer function (see pg 15 of "h2susitmy"), RT is about a factor of lower in DC magnitude, and the shape of the response is completely different from LF, where they should be measuring the same thing. RED FLAG

Since Betsy and Jeff's work was on the RT blade spring tip clamp, I conclude there's still something screwy going on there. Given that the pitch frequency has moved up, something must have been corrected. However, I conclude there are two possibilities: mechanical and electrical, and likely *not* a rubbing problem. Here are our ideas:
 - the dynamics of the suspension are effected by the blade tip being strangely clamped (either not totally fixed, or fixed to some bad state)
 - the differential roll that's present at the top stage is causing the RT OSEM coil to drive dissimilarly hard (most probably less hard) as LF, causing a "vertical" drive to induce roll
 - the RT coil driver electronics have been messed up in the reassembly process

I'll have the assembly team go in for the final, final-final, final, final; just before final, final investigation and change before the finally cabling up the reaction chain.

This is a follow-up entry of this one in ilog. The only difference is I'm injecting 20W instead of 2W into MC.

While students were adjusting squeezing table, I quickly swapped the VCO of H1 from the old one to the aLIGO test unit and measured the MC feed back signal going to the VCO.

New VCO has a smaller range, and I needed to increase VCO gain by 8dB.

Green and blue traces in the attached are the VCO feedback signal (H1:IOO-MC_F) with the old VCO from two different lock stretches, and the red is the same thing with the new VCO but scaled down by -8dB. With this setting, OLG of the MC servo with new VCO was only about 0.4dB smaller than the old one.

The new VCO is not doing any harm. In kHz range it is clearly better than the old one.

Considering the fact that the previous test with 2W into MC showed a smaller improvement, it's also clear that the measurement is limited by the sensing noise of MC.

For a better test you need to wait for the full H1 IFO to come back, but this is already good enough in that nothing seems to be wrong.

Attached is the Apollo Pressure Test Certification.  It's all set!

Bland, Bartlett

In our continued hunt to find a rubbing source on the reaction chain (R0) of the ITMy QUAD, we discovered that the right Top Mass Blade clamp was not fully seated on the blade tip.  It's funny how this sort of thing can stare us right in the face, and yet we all miss it with the numerous sets of eyes on it!  This explains why the misplaced pitch frequency was not improved when we adjusted the blade tip heights last week - we correctly set the blade tip height, but the wire break-off point was completely in the wrong place due to the mis-seating.  

We fussed it back into place, which corrected for some of the strange roll we observed late last week.  Yet another round of OSEM alignment (undoing the table cloth adjustment I had to make last week) followed by diagonalizations of both R0 and M0 which looked much cleaner this time.  It had a thorough pass for touching EQ stops, and a careful shrouding.  We're go for TFs, ...again.

One outstanding strange thing I found today (amongst the aforementioned!): the M0 F2 OSEM seemed to need it's offset disabled in order to track appropriately on the speed dials.  SO, it seems we have not reset all of our values/buttons correctly from last weeks power outage.  I did not investigate further beyond switching the offset so I could continue with my OSEM alignment.  Can someone (ehem, Kissel) please check medm, please?

Note, Robert S. was contemplating making some mag measurements tonight, so check for damping enabled, etc.

- DougC and JasonO taking shots in LVEA...done by ~1425
- ICC staging at BSC8, Kyle cranes pump cart over YBM and plans on commencing pump down soon
- Welcome MichaelS from ANU
- Reibold finishes dry wall by H2 PSL Diode Room, finishing touches remain
- Pipe welding at EX
- Alignment of BSC5 continues at EX
- RichardM investigates H2 overhead camera's signal which is flickering terribly on all displays.  Problem seems to be upstream from MSR
- BetsyB, JeffB, AndresR, EricA working in West Bay test-stand area
0918 - Hanford Fire Department arrives to check outbuildings
1300 - Diamond Freight arriving for pick-up
1400 - MikeL visits outbuildings
1440 - Laser Hazard in LVEA
1600 - DanM running cable from Computer Users' Room (LDAS tape library) to MSR under raised floor in Control Room