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.
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.
I cleaned the remaining optics for the TRANSMON table. 4 hands are better than 2, but it worked out anyway. We should be able to start baking next week (waiting for the optics holders).
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.
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)
To follow up on the "Apparent Y-1 leak" entry made last night: Today I found a very large (~1x10-4 torr*L/sec) air leak on the 1.33" conflat flange at the valve body/annulus piping interface on the south side of GV9. I also found a lesser (~3x10-7 torr*L/sec) leak on the 2 3/4" conflat flange located on the gate side of the 1.5" all-metal gate annulus isolation valve -> *Hard-Closed GV9 *Isolated and vented gate annulus piping *Replace gasket on leaking 1.33" conflat joint *Cinched-up flange fasteners on leaking 2 3/4" conflat joint *Pumped and recombined vented volume to rest of annulus *Opened GV9 I am leaving the leak detector connected and valved-in to GV9's annulus system overnight tonight. I will do some sensitive leak checking tomorrow. NOTE TO ALL We have many original "legacy" bolted joints on the vacuum system throughout the site. Though these have stood the test of time up to this point, they may still be vulnerable to being mechanically or thermally exercised, bumped, flexed and the like. Please be cautious and conciensus when your work requires contacting bolted vacuum joint/flanges.
Work on the roof was finished today in preparation of the HVAC people coming in tomorrow to set up ducting. The exterior floating wall was also worked on, using 1" drywall screws to prevent contact between the screw and the inner layer of sheetrock. Tomorrow they plan on finishing the interior insulation and starting work on the HVAC system.
Dust counts remain normal, although there were a few brief periods, no longer than 5 minutes, where counts exceeded 20,000 at 0.5 microns. This does not appear to have affected the cleaning by HAM12.
BSCISI #1
Jim is working on prep work for getting parts (mainly hardware such as helicoils, bolts, etc.) Class-A-ed and ready for upcoming work.
BSC Work Area Clean Up
More Small Outer Walls Installed. The Horizontal GS13 Walls were pre-assembled and rest on the Optics Table. We do not have Flexure Access Outer Walls (D071058) available; Hugh assures me that some are currently in a Bake Oven now and could be available in a few days.
Weights have been put on the Walls & on the Optics Table. Now that the innards of HAMISI#3 are being cleared away from both SEI cleanrooms, more and more space is being created for upcoming BSC work!
To confirm modeling, we weighed the Assembled Stage0. The 1250#s does not include the Spring posts which some might include in the assembly but we didn't have them mounted. It does include all the bolts clamping the plates together and all helicoils and dowel pins. It also includes the three 1/2-13 lifting eyebolts. The design weight is 1242 so we are right there.
[Corey, Hugh, Jim, Stephany]
BSC#1 Assembly Work
More helicoils were installed on the Optics Table (until we discovered we were almost out of helicoils). The Stage0 Base was lifted off the tested so it could be weighed (this was done with a load cell via the forklift).
BSC Work Area Clean Up (aka HAMISI#3 Work)
Made first attempt at installing the Vertical GS13's & two thirds of their Outer Walls, and then discovered the feed-thrus did not line up with the hole in the Stage-1 floor! Basically, procedure (E0900216-v5) uses a drawing to show how to orient/install the vertical GS-13, and this drawing is 120 degrees off. Looking from the top, the Vert GS13 should actually be 120deg counterclockwise from how it is displayed in the photo (figure is attached). So most of the day was devoted to installing the GS13/Walls, uninstalling, and then re-installing. In all the hub bub, I failed to note the Serial Numbers for the now-covered GS13's. I did get one of them though. V2 is S/N 163.
One More HAMISI Procedure (E0900216) Note
For installing the Outer Walls, the procedure does not make mention of torquing the 120deg brackets during installation (this is in Sec. 4.34). This could be an easy thing to forget during installation with all the bolts to be torqued.
