Linoleum was removed for laser room and ante room, and a skim coat was added where needed. Contractors were about to glue the new linoleum down but the glue they had was unusable, hopefully they will have more tomorrow.
Required temporarily depressurizing plumbing supplying CDS level transducers. Hope to continue at X-end tomorrow.
~9:00 Hugh and contractors installing HEPI on BSC 7
~11:00 Kyle to begin Plumbing mechanical level gauges at Mid-X and End-X.
- a CP alarms went off, HVE as well at Mid-X
~11:00 – Hugh to begin removing the north door of HAM 8, block the support tubes, and remove the external SEI
3:30 – on-site arrival to work on copy machine
[Corey, Greg, Jim]
A new Stiffener Assy was installed under Stage0
On Stage1, The Keel Base was removed. The Pitchfork & Boxwork Assemblies (i.e. Stage1 Walls) were also removed and disassembled. The Keel Base & Stage1 Walls were then pulled out & stored outside on a pallet.
Next up: Begin building up Stage1 Pitchfork/Boxworks (when new clean parts become available).
Ran well pump this morning to fill tank
David & Scott (Apollo), EricA, Hugh We got the HEPI Housing up on the NW Pier, so approaching 3/4s done on BSC7. May need to redo a few things with new shims to prevent interferences but we don't have a lot of room with which to play.
Installed mechanical level gauges in parallel to CP4 and CP3 level transducers. Resulting alarms for CP4 and CP3 are the result of this. Indicated levels should settle down over the next day-I am monitoring from home
[Corey, Jim, Mitchell (with Justin helping us move the cleanroom)]
Today we addressed the Stiffener Assembly under State0. Unfortunately, we were not able to disassemble the Stiffener as is. 2-3 bolts of a Support Post Gussed were inaccessible. So basically we had to lift Stage0, unscrew a few bolts, and then lay Stage0 down again.
After this, we removed all Stiffener plates (these are more of the badly machined plates and will be thrown outside in the desert).
At this moment, the new Stiffener Assembly is being assembled.
Note: Particulates documented from Spring Pull-Down Assy (see attached photo).
Doing a test install of the HEPI Horizontal Actuator yesterday on the NE corner of BSC7 I find an interference where the Actuator runs into the Housing. See the photos attached. The first photo(003) is the Actuator held by the lifting jig. The second photo(001) shows the Actuator Tripod seated to the Crossbeam Foot and the third photo (002) shows the interference between the bottom support weldment of the Actuator as it runs into the HEPI Housing Side Frame. It may be a unique condition of BSC7 but I think it will be a recurring problem. The solution should be a simple permanent shim and I'll have to use longer bolts. However, I'd like to investigate before deciding on a blanket solution.
[Corey, Jim, with cleanroom move help from Andres, Mitch & Robert]
Released Spring #1 & #2 (#3 was released on Wed). The Springs were then untorqued of Spring Posts and removed from Assy. The Flexure Assemblies were slipped out from the Flexure Mount. Will keep Flexure Mount assys torqued on the Spring tips (there's no need to remove them, and removing them has been observed to cause damage to the Spring and Flexure Mount hardware). Spring Compression tooling was removed, and we were staged for Stage1 removal.
Spent lots of time shuffling & clearing out Staging floor (there was no room to maneuver the forklift for out needed work).
Filled forklift batteries with water (many cells were dry); it took two full jugs of water!
Forklifted Optics Table from Assembly Stand, and moved it out of the way and landed it on Test Stand in other cleanroom.
Stage1 was craned off of Stage0, and it was layed on the Assembly Stand. This required (5) people because we had to have a person on each cleanroom leg to move the cleanroom as we craned Stage0 over.
Note: Regarding hardware, assume we will re-use all the hardware (I'm mainly referring to bolts/washers) we are pulling out here.
Swagelok delivery for Hugh Office Products delivery 10:25 Mayflower picked up the remaining IO beam tube 12:50 Dale brought in a tour 13:52 Jonathan B. went to take pictures of PCAL Terry S. craned the auto scrubber over the beam tube HAM 11 was moved behind HAM 12 The clean room from HAM 12 was moved over HAM 11
Ran well pump to fill tank.
This week Marielle is here from Glasgow to help us bond ears and glue prisms and magnet flag mounts to the ITM and ETM PENs. We have 4 of each PEN types (although they are physically and functionally the same) in house. Note: The serial numbers transcribed here are for PENs only, although they are labeled the same as Test Masses. This does not imply any matching of specific PENs to specific TMs, just an unfortunate naming convention of these PENs early on. Marielle hopes to have 4 PENs with ears by the end of the week. Having a bit of a late start and a short commissioning phase in the LSB bonding lab this week, yesterday ITM04 (which had ears bonded last Sept during Marielle's last trip) had sapphire prisms glued to it. As well Gerardo and Marielle bonded the first ear to ITM01. Today, we glued the magnet flag mounts and 416 SST disc insert to ITM04, and are working on bonding the second ear to ITM01.
Mayflower arrived Wednesday to pick up the IO tubes for scrap. One tube was loaded into their truck and departed the site. They will be back next week for the second one. many joined the sendoff and copious pictures were taken.
Mayflower is on site picking up the second IO tube. Farewell!!
[Corey, Jim, Mitch]
Today we started partial disassembly for the HAM-ISI (assy #3) which had been stagnantly stored on the Test Stand for the last few months. Today, parts loose Class A parts were removed off the ISI & stored. The Optics Table was removed (laid down on the Assembly Stand in the same cleanroom; will forklift to the other clean room's Test Stand for storage), and ONE of the Springs was released (the other TWO are ready to be released first thing Thurs morning).
changed filters in AHU4(Office air handler).
[Corey, Dave, Eric, Hugh, Jeff, Scott]
NE Pier
Most of today was devoted to installation of the Vertical Actuator. This Actuator gets installed after the HEPI assembly is in place. Once the HEPI assembly is in place and connected (via HEPI Foot) to the Crossbeam, the Vertical Actuator can be installed. The Actuator has been tested and flushed at this point (i.e. it contains "HEPI fluid"). Before the Actuator is craned into place, inlet/outlet hoses are connected to the Actuator, filled with fluid, and then capped off. At this point, the Actuator was carefully craned into place (see photos). We have a fixture (yellow item in pictures) which holds the Actuator and allows installers to tilt it as it gets installed. At this moment, the Actuator is in place and resting on it's Unified Actuator Brackets (they aren't torqued down to the HEPI Assembly). Only one HEPI Assy Stiffener was re-installed. The Support Bracket will need to be removed for the other one to get installed. The Actuator has also not been connected to the Foot on top.
SE Pier
iLIGO Coarse Actuation System stack has been removed. Marks have been made on the Pier (holes can be drilled out tomorrow).
Misc.
As we've worked we've found that the Support Brackets needed several modifications due to interferences or non-fits. Sections of the Bracket have been cut off, and slots have been made longer.
Cut out was also made to the yellow Actuator fixture to prevent rubbing against a valve.
Activities in the LVEA throughout the day: Cleanroom assembly work throughout the day HEPI pier and actuator install on BSC7 Other On-site Activities: ~9:00 - ACE on-site to work on plumbing ~9:30 – Paradise water delivery 11:15 – wood recyclers on-site ~12:00 - on-site to see Bubba with Apollo for some sheet-metal work 12:30 – wood recyclers returning the box ~1:00 – Swagelok delivery for Hugh ~2:30 – Kyle begins to plumb in mechanical level gauges in parallel to existing level transducers at Y-mid. This work will take approx. 2hrs. ~3:30 – FedEx delivery for Bubba of Apollo. Kyle's work will continue tomorrow morning. The HEPI installation continues at the end of the ops shift at 4:00pm local.