kyle.ryan@LIGO.ORG - posted 19:50, Wednesday 19 January 2011 (494)
Corner Station purge air off from ~1100 -~1900
Hard-closed GV5, soft-closed GV6, isolated IP5, connected aux. pump cart to GV5 annulus (did not valve-in), spun-up YBM MTP -> all in preparation of venting YBM -> Did not vent YBM as scheduled. Had shut down purge air compressor in the morning to inspect internals of airbox and ended up spending the rest of the day disassembling the airbox, cleaning and caulking leaks noticed between the sheet metal stitch welds which were allowing compressor cabinet air to enter the compressor downstream of the inlet air filter. The compressor crankcase vents inside of the cabinet and this air is laden with turbine oil vapor. This air was entering the 1st stage compressor inlet by way of small unsealed passages (gaps) which occur between the welded sheet metal airbox stitch welds. Inlet air is intended to enter from LVEA ducting only. Evidence of condensed oil was noticed in the intercooler condensate drain bowl but nowhere else downstream -> I showed John W. the details of my concern. In addition to caulking, I fabricated gaskets for the bolted sheet metal components of the airbox. These steps are expected to eliminate cabinet air from entering the compressor intake.
Today I successfully fully hung the BS/FM (FM1) for the first time. After several rebuilds of the wire loop/middle wire assembly due to kinks and breakage (2 more rebuilds today after Betsy's last post), a complete hang and rough adjustment was completed. After setting the blade tip positions in the top mass, I released it and the top stage from their stops. The initial pitch of the top mass was out ~10 degrees, during which time I noticed that due to the off-center position in which the wire exits through the base plate of the top mass (see pic 6), the wires were touching the edge of the base plate holes. This is something to watch carefully for in subsequent assemblies as a more severe pitch issue could damage the wire assemblies enough to warrant a rebuild. I would recommend slowly lowering the EQ stops until it becomes apparent that this is not an issue. If it seems to be, stop and reclamp the mass until enough mass is shifted to hang level. It did not seem that the contact was severe enough to gouge or bend the wires, so I proceeded to move addable masses around on the top mass, as it became apparent that that the pitch adjuster screw would not have enough range to remove all the mis-pitch. In all, I had to move ~200 grams of masses to the OSEM side of the mass. Having done that, all the DOFs look rather good. However, the chain does appear to be hanging biased toward one side of the structure, so I will have a look at centering it up using the top stage adjustment tomorrow.
~9:45 – Kingsoft arrives on-site ~10:00 – Dani adding safety fixtures to PSL table ~10:30 – SnoValley arrives on-site ~10:45 – Kyle notifies Control Room he will shut down the purge air compressor in the Corner Station. ~2:45 – Oscar and crew finished baling tumbleweeds other activities throughout the day: Cleaning around BSC 8. To be continued tomorrow.
Dust monitor location 4 moved into the clean room around BSC8 Dust monitor location 8 temporarily removed, sensor fail.
The first bin of aluminum(~5000lbs) from the iLIGO stacks was picked up this afternoon. An empty bin (for SS) was left on site ready for loading.
I reduced the heater setting for AHU3 hot deck. One stage remains on.
BSC4's Scissors Tables were centered vertically, and Stop Links were installed on them to keep them centered. Attached are photos showing 1) the Stop Link & the Slotted Link, and (2) a creepy spider-webbed Scissors table.
Kyle, Chris, Zak -> Installed BSC7 east door Kyle -> Pumped XBM down to ~32 torr. Will resume pumping on Monday.
9:30 – work in LVEA to move HAM7,8,9 Optics Tables & BSC6,7 Downtubes/Optics Tables to the recycling bin 10:15 – Roger's Machinery to work on pumps with Kyle 10:30 – Dani in the LVEA modifying PSL table enclosure 12:00 – ISI passive stack removal work finished 1:30 - Kyle notified the Control Room he was to begin putting the door back on BSC7 12:15 – Michael R. making PSL measurements in LVEA 1:30 – Dani installing LED lights in outbuildings
Today, we loaded the weight adjusted (to 12,630g, nominal 12,621g) Top Mass into the Table cloth mounted in the structure. Our first attempt at stringing the middle wires up from their attachment point on the Penultimate Mass to the Top Mass failed when we dropped one of the 4 top clamps causing a kink in the wire (recall these are long and unwieldy and get threaded through the structure, a very delicate 2 person task). After disassembling the multi-segment set of wires again, we fixing the kinked one and re-threaded it. We then leveled the Top Mass and hung the Pen and Test Mass. We were in the middle of adjusting the 4 blade tip heights and lateral positions in the Top Mass when we accidentally broke a middle wire with a tool. We have disassembled the wire segment again and fixed it, but stopped there for this week. The learning curve continues on the BS type suspension triple.
When hitting "enter" in quick search, it doesn't execute the search, it just returns the entire alog.
Fixed Sept 2011.
I've removed the H2 PMX camera that was on HAM8, and covered the viewport with a yellow blank. H2PMX lighting (LED light) is still mounted to the HAM8 West wall on the most North viewport. It can remain, or be removed at any time.
(Chris, Corey, Hugh, Jim, Mitchell, Zach) HAM7,8,9 Optics Tables & BSC6,7 Downtubes/Optics Tables have been loaded into our-recetly-arrived bin. This bin is pretty much filled and ready to go.
Summary: Ten minute cleaning sessions, using the black disc vacuum cleaner, produced zero dust counts just inside the curtains of a clean room over BSC7, a few meters from the cleaning site. The dust level was about the same for a session with just the vacuum on but no movements. Mike L. asked me to try the vacuum test at night while it wouldn’t be confused by other activity in the LVEA. Patrick and I set up dust monitors and selected to clean in the hard-to-reach area along the output beam tube around HAM4 & 5. This region was near to the clean room over BSC7, which was open (with dust covers). No one was in the LVEA except me for the course of the experiment. For each cleaning session I entered, walked quickly to the cleaning area, turned on the Euroclean GD-930-H labeled “HEPA” (one of the black “disc” vacuum cleaners), with the long brush attachment, and cleaned for 10 minutes, running the attachment along the floor under the cable trays, behind the ISCT4 enclosure, and along the tops of the HAM4&5 chambers, where I could reach. After 10 minutes I turned off the vacuum cleaner and quickly left the LVEA. The attached figure shows dust monitor data for two of these cleaning sessions (note the two dust events). For the first cleaning session, a monitor was located a couple of meters away from the BSC7 clean room curtains (RED trace). The count level reached several hundred particles (0.3 microns or greater) per cubic foot during cleaning. For the second session, this monitor was moved just inside the curtains, on the ground. At its inside location, it recorded 0 counts during the second session. Thus the monitor was working, and dust levels were appreciable outside the clean room, but zero just inside, even though it was on the floor below the bottom of the curtains. The black trace is for the monitor a few meters from where I was cleaning. The blue trace is for a dust monitor on the far side of the BSC7 clean room, in the beer garden. The green trace is for the monitor at the halfway point of the 2k input mode cleaner. The monitor in the clean room around HAM12 did not detect my dust either. Finally, I tried one session where I did no cleaning, I just turned the vacuum cleaner on and let it sit in one place. The counts at all locations were similar to when I was cleaning, so either most of the particles comes out of the vacuum cleaner, or else the air blowing out the exhaust stirs up most of the particles. Robert, Patrick
Quad 2 was removed from the test stand and parked in the SB. The upper structure, lower structure, and lower two masses of the beam splitter (FM1) were attached to the test stand, yesterday.
Yes as Patrick logged, the PISI was removed yesterday from BSC7--CoreyG JimW Zack Rodney Chris & HughR We pulled the dome before lunch. There was quite a bit a stuck O-Ring during the separation but we got it back in place without any unusual effort requiring maybe 20-30 minutes. No issues after that--remember to PULL the draw string when installing a flat cover! After lunch we went for the PISI pull. The bolts below on the inside of the Support Tubes were generally bound and did not un-thread readily as they did in MidY. The top bolts were fine. Relief came with a little lift from the crane but we didn't fine tune that too much. There are only 18 bolts below and James powered through. Again, as at MidY, no trouble pulling the Support Table from between the Tubes. We pulled the Work Platforms before we exited. Except for flange/o-ring cleaning/inspection and Dome balancing, the Chamber is ready to be buttoned back up. The Stack is now by the LEA roll-up door and we be de-stacked today. Good location for a look-see of the simpler times of iLIGO. I don't have any photos but Dale video'd and photo'd the entirety; I'm sure we'll see something good from him.
I've attached three photos of the BSC7 stack removal. The complete set of photos are available in ResourceSpace at https://ligoimages.mit.edu/?c=460. The name of the ResourceSpace collection is LHO_BSC7_stackremove.
