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).

More HVAC work. Ducting was extended to the LVEA wall and into the return air plenum - the contractors drilled a hole in the LVEA wall for this. They also began finshing work on the interior and exterior drywall, taping joints and patching over screws.

Dust counts were low for today. One spike to 5000 at the 2K PSL at 0.5 microns, but other than that it was below 3000 for the whole day.

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.

More HVAC and drywall work. The make-up air ducting was installed on top of the roof, and extending into the interior of the room. The ducting does not reach the LVEA wall yet. The interior drywall was installed, both on the walls and on the ceiling. Some patching between sheetrock boards was done on the exterior floating wall. More HVAC work to be done next week.

Good dust counts for the day, counts were below 2000 for most of the day at 0.5 and 0.3 microns at the 2K PSL - and this was while they were cutting a hole in the roof!

9:27 – moving of the de-grouting room over the beamtube for the last 2 grout pads

10:30 – de-grouting begins at Mid-Y.  Dust monitor levels remained reasonable (less than 200 cts for 0.5micron particles) throughout the work

H2 PSL enclosure building work continued.  Dust monitor levels near the work spiked twice momentarily above 3000 cts for 0.5micron particles for less than 2minutes at a time.  Otherwise, dust levels were reasonable.

Q3 was removed from the Test Stand today and parked in Class B storage containers.  Pictures attached.

The iligo cds main NFS server hanford2 suffered a disk failure at 00:05 this morning. The disk is in the external 16 disk-raid scsi unit. The spare disk was then taken by the system and is in the process of being regenerated. It is currently 53% complete 17.5 hours later, so should take another 17 hours (10am tomorrow). One concerning point is that two of the drives are not being accessed, the failed disk (sdk) but also a member of the raid (sdg) which should be used to the same degree as all the others. I'll let the regen complete before investigating whats going on with sdg (syslog does not report two disk failures).

Lots of work today. The exterior floating wall was completed, as well as the interior insulation on the walls. Supports for HVAC ducting were drilled into the LVEA floor and the enclosure roof. Tomorrow they will be drilling into the roof for ducting.

Dust counts were a bit higher today than the rest of the week, but still no signs of construction affecting the HAM12 clean room.

The SW corner of BSC 8 has a HEPI frame and foot mounted to the pier. The SE corner has the old iLIGO stack removed and the new aLIGO holes drilled.

• PSL acoustic enclosure construction continues
• Ski pressurized water tank at MY
• Degrouting work at MY. Patrick hooked up a dust monitor there. Dust counts spiked up to 400,000 at 0.3 microns initially but settled down to 100,000 as work continued

BSC Work Area Prep

With the innards of HAMISI#3 mainly installed on #3, spent most of today baggin/taggin, cleaning, and organizing the (2) SEI Cleanrooms such that they will be operational and ready for BSC Assembly work.  Many shelves are totally free and ready for BSC parts/hardware (will probably start loading shelves with BSC Actuator parts tomorrow [this is a subassembly we are fairly ready to tackle]).

Jim & Mitchell were surrounded by BSC hardware as they were getting it sorted and organized for upcoming Class-A-ing.

HAMISI#3 Status

Not much done on this guy, although toward the end of the day, I installed dial indicators, unlocked the ISI and made a first attempt at balancing.  With Jim's numbers for weights, I was able to get the ISI leveled vertically within 0.005".  (note, we are missing the Flexure Outer Walls...they are being Class-A-ed)