(Corey, Jeff G., Jim, Vincent)

o  Jeff broke most of the helicoil tangs on the Optics Table.

o  Measurements were made on the (3) Stage0 Blade Posts with the Romer Arm. 

o  Blade Posts were installed on Stage0 (although they couldn't be torqued down because we didn't have a socket for these BIG 5/8" socket head cap screws).

o  Continued wrapping/bagging/tagging HAM parts, to clear room for BSC parts.

Further work at HAM7/8 and 8/7.
Cleaning at MX.
Received some more plates for Hugh, and a shipment for Gerardo & Betsy.
Kyle pumped down some of the annulus volumes and opened GV7.

(Corey, Hugh)

Final few hundred helicoils were installed on the BSC ISI #1 Optics Table---that's (3,225) 3/8"-16 helicoils & (18) 1/4"-20 helicoils. 

Next up, breaking 3200+ Helicoil Tangs:  "Ain't No Party Like a Tang-Breakin' Party!"
 

Ski changed the RO filter
Removal of concrete at HAM8

Scheduled activities from morning meeting:
cleaning at mid and end x
HEPI prep at BSC4
drilling holes for HEPI piers at HAM7

Attached is a plot of 5 micron dust counts from 14:00 to 23:00 UTC. The spike at location 9 to ~1,810,000 particles per cubic foot occurred at approximately 15:59:07 UTC. Breaking concrete began around 16:16 UTC.

BSC ISI---Several hundred helicoils installed in Optical Table.

HAM--Unit#3 loaded, floated, balanced and ready for testing.

BSC8 HEPI Housings Installed.

Today's Activities:

9:15 - Apollo pier work began on HAM7

cleaning at Mid and End-X

Kyle to soft-close GV5

H2 PSL enclosure construction

HEPI post setup on HAM7

HEPI pier installation at BSC8

Dust Levels:

Near the HAM7 work, dust monitor DST9_5 (5 micron monitor) had counts hovering around 10000 cts throughout most of the day with a spike of ~71000 cts lasting a few minutes during cleanup around the area at about ~15:30 PST.

BSC 8 HEPI install is completed. Ran into a little hiccup where the frame's front brace for the foot interferes with the cross brace. The pictures attached show the problem. It should be an easy fix during the pre-positioning to check and make sure it won't interfere.

The exterior and interior walls of the enclosure have been primed and will be painted tomorrow. Feedthru holes were drilled and PVC pipe was installed on all but 2 feedthru locations. Holes for EMT conduits were also drilled into the roof, at 3 of the 4 locations. No HVAC work today.

There were several dust spikes above 20000 in both 0.3 and 0.5 micron, but Apollo was also drilling by HAM7, which contributed to the dust counts.

We built the front end code and DAQ code from the latest version of advLigoRTS on h2build. We also built a production h2susetmy machine, which has the production IOChassis and timing systems. The build process was documented, and we are writing a "LHO front end models builder guide" in preparation for the first BSC controls system.

Throughout the day:
H2 PSL enclosure work continues
HEPI installation on BSC7 continues
HAM 7 drilling for HEPI posts

Jodi & John to End Y to check on caulking being done on ceiling tiles
~10:00  clean room moved to ham 7 - particle cts jumped to ~1000
richard to bsc7 to work with electronics

~1:00 Jodi to X-mid for some inspection

filiberto and paul to mid-y looking for parts

The Pump Servo commissioning at LHO continues.  A lead was placed inside the servo box on the circuit board at TP7, which is after the gain and is the signal the DAQ receives.

The leads were then plugged into an SR785 and an oscilloscope to monitor voltage signal and to take an amplitude spectrum of the signal with and without PID control.

Spectra were taken from the pressure sensors #1 and #4.  Sensor #1 being before the fluid reaches the accumulators and #4 being after the final accumulator. Sensor #4 monitors the pressure as it leaves the pump station.  Data was also taken of the pressure sensor outputs without pressure in the system as a baseline noise measurement of the sensors. 

The first plot is of Sensor #1 and has the PID ON/OFF and sensor noise traces on it. The second plot is of Sensor #4.

The data taken with Sensor #1 has some double resonance peaks at about 10, 20, and 30Hz while the data from Sensor #4 shows these resonances as a single peak at the same frequencies.  Sensor #1 also has a peak at 5Hz that is not present in the data from Sensor #4.  The data also shows little to no improvement in the PSI fluctuations with the PID control ON or OFF.  However, these PID parameters were very conservative with the parameters of P=2, I=1, and D=0.1.  

The sensor noise is also very close to the fluctuation with and with PID control for frequencies above 2Hz.  It looks like the limit on controlling the pressure is the fluctuation of the sensor readout itself.  However, the pressure fluctuations are below the pump servo goal, except for the 10, 20, and 30 resonance peaks present on all the traces.

Condensate lines were added today. They do not fully extend to the LVEA wall yet. More finishing work on the drywall, and a second hole was added for the return air ducting on the roof.

Dust counts in the low thousands. I'm not including the beer garden in this plot because HEPI installation work on BSC8 would skew the data.

Work continues on BSC 8 HEPI install. The final corner (NW) is being drilled out and tapped, but special consideration has been made for the calibrated leaks and RGA near the pier as seen in the pictures.

Today's Activities:

H2PSL Enclosure construction

HEPI pier installation at BSC 8

10:00 – contractors craning over beam tube at Mid-Y

2:30 – delivery and on-site pick-up from diamond freight

3:30 – tour group stops by the control room

(Corey, Eric, Jim)

HAMISI#3 Status

Installed the large Walls & Flexure Walls on the Assembly, installed and ran all cabling, checked level and balanced the ISI.  Via the Dial Indicators, the level was good to within 0.001".  An Unlock/Lock check also saw the Dial Indicators stay within 0.001".

Shims used for Lockers:

• Locker A:  0.030"
• Locker  B:  0.028"
• Locker  C:  0.021"
• Locker D:  0.027"

For all intents and purposes, this ISI is ready to hand off to Vincent for testing.  What's left:  Get Test Stand up & running (Richard and crew?), Use new BSC/HAM Feedthru Interface, set gaps on Sensors, and then start testing this HAM.

HVAC guys installed the make up air fan in the return air plenum, as well as the flexible connections for the ducting. More finshing work done on the exterior and interior drywall.

Dust counts low again.

• Cleanroom  moved at EY
• PSL construction continues
• Well pumped at EY
• HEPI install at BSC8

scheduled work from morning meeting:

cleaning at end X
prep for LOS removal at mid X
HEPI work at BSC8
duct installation for PSL enclosure

On Friday the wrong size bolt was used in the 1/2-13" holes used to clamp the HEPI frame to the BSC pier. This caused it to seize when the shoulder of the bolt got to the threads. When trying to back the bolt out it snapped with ~ 2 inches of threads left in the hole. After trying several methods of extraction (with no amount of success) a 27/64" bit (the same size used to prepare the hole for tapping) was used to drill out the bolt. The bolt cleared out, including the threads, for the most part and a tap was used to clean the remainder out. Enough thread was left to use a new bolt and clamp the HEPI frame to the pier (at 45 ft/lbs torque).

The pictures attached show the sheared bolt (photo 1) and the hole after being drilled out and re-tapped (photos 2 & 3).

Betsy and I finished cleaning the ~30 optics I have in hand right now for assembling the TRANSMON table.
Few more optics are coming next week.

After a couple of trials, and with the help of Margot who was on site this week, we think we converged on a good practical procedure (ref: E000007-v2):

- Do the cleaning in the bonding lab (nice and clean), not the optics lab
- The sequence is: liquinox, DI water, methanol, nitrogen blow-off, but the important point is to make sure that your gloves are clean each time, as we
noticed that gloves are really the main cause of contamination (DI water on gloves when doing methanol, etc). With 2 people is easy, as one person can do the liquinox + DI water, and the other one can do methanol + nitrogen. For one person alone, the best strategy we found today is the following: do liquinox + DI water + methanol for all the optics with the same gloves, than change gloves and repeat methanol + nitrogen blow-off if necessary
- Use a lot of DI water (more than 30 seconds) and get rid of liquinox on your gloves too
- At the end, if there are some particles or streaks left on the optics, wipe with methanol (rarely needed)

We also tested first contact on a small 1" optic. 
Before I left, I put a couple of clean old REO mirrors (2" HR1064) in the new Empire West clean boxes I bought (I wiped the boxes first).
I will take a look next week to see if they are still clean.

I left all the optics in the bonding lab (see pictures). As not all these optics are scribed (some are borrowed from iLIGO ISC and squeezing), it would be helpful if they could remain as I left them, so I can keep track. 

In case you need to use that bench, please let me know.