Andres and I weighed the Q2 US and UI Masses.
(1). Upper Structure - 254lbs Note: The Cross Braces and their corresponding fasteners are not fit.
(2). UI Test Chain - 21.526Kg
(3). UI Reac Chain - 21.532Kg
Jake from SnoValley working on glycol pump Dale took pictures in LVEA Terry craned the auto scrubber over the beam tube Terry, Christina, and Gerardo Jr. cleaned around BSC8 Kyle vented YBM BSC8 door and dome were removed and covered Dani put locks on H1 PSL enclosure
[Chris, Corey, Hugh, Jim, Kyle, Zach]
The BSC8 Door was removed. Jim entered chamber and removed the (18) inside Support Tube bolts. Dome was removed, and Chamber was covered. De-install & re-install of Dome will occur tomorrow.
Kyle - Valved-in aux. pump cart to GV5 annulus, vented YBM -> Leak from YBM to Vertex (known) -> Using aux. pump cart on GV1 annulus. Kyle, Chris, Zak, Rodney, Hugh, Corey - Removed BSC8 south door.
In preparation for the squeezers' reactivation of the PSL, the enclosure has been modified to allow it to be mechanically locked when the laser is running, reducing our reliance on the interlock system and adding a layer of safety in place of wearing glasses in the LVEA. Pictured below, the inner doors are held in place by aluminum 3/4" x 3/4" bars only accessible by opening the front doors, while the front doors are prevented from moving by padlocks secured through holes drilled into the sliding tracks. The padlocks are all similarly keyed and the key will be kept in the control room. Note that even with this system in place it's still possible to move some of the doors enough to trigger a violation.
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.