Thoroughly thawed Y-end LN2 economizer valve with heat gun then tapped with hammer, turned adjuster screw fully cw then backed out (7) complete turns ccw need to increase LN2 vapor pressure to nominal 10 psi. ~1815 - shut down rotating pumps purge air compressor at Y-end until LN2 vapor pressure problem is resolved.
Kyle - Removed all but (4) bolts from HAM1 West door. Kyle, Ski, Jodi, Chris (apollo) - Removed then rehung HAM1 East then West doors
(Chris, Corey, Jodi, Kyle, Mike L, Patrick, Ski) Corey: This afternoon the crew went about clamping HAM1's optics....in a new way. Generally, the IOT1 & ISCT1 meatlocker/table are moved out of the way and we install platforms to access the table. This time we tried a new method: keep everything in place, remove a HAM door (keep it out of the way and suspended from crane), work on HAM Table, re-install door, and then move to the other side of the chamber. One thing we didn't plan was a platform to work on. So reaching optics was certainly a pain. East Side Worked on this side first (MC1, MC3 & "half of MMT3"). The belly bar was installed one set of holes higher than normal, and to reach these optics I did have to step on the Crossbeams ( generally a no-no), but not much weight was on the Crossbeams because my belly was on the belly bar. For MC1, I was able to visually confirm contact of all EQ stops tips on the mirror. For MC3, there was no way I was going to be able to visually confirm contact of all Stops, but I think it's secure. While on the East Side, I went ahead and contacted the four EQ stops to the chamfer (this is for MMT3). I did this because this side of the Optic will be a stretch from the west side. Patrick: West Side I locked down MMT1 and the west side of MMT3, Mike locked down SM1. On MMT3 I had good visual confirmation of contact on the west side and the east front bottom. The east front bottom needed further clamping from what Corey had already done, as I probably moved it with the other stops. I could not see the contact on the remaining three on the east side and did not touch them. On MMT1 I used a 1/4" 20 Allen wrench to turn the front top and bottom east side stops through the baffle. I did not move the bottom west side, as I could not see the tip. These are viton tipped. I moved the back two springed stops by hand and confirmed that the optic was secure by pulling and releasing on the edge of the baffle. I stole the cable from the dust monitor at location 8, and connected a dust monitor sitting in the cleanroom between HAM1 and the 4k PSL. I set its location to 8. For a while it was running outside of the cleanroom, but was inside before the doors came off. It should be trendable.
(Corey, Patrick, Ski, Jodi, Kyle, Chris (Apollo), Mike) We locked down HAM1 suspended optics MC1, MC3, SM, MMT1 and MMT3. In order to avoid moving IOT1 and ISTC1/acoustic enclosure, we first craned out the east door, locked MC1/MC3 and half of MMT3, replaced the door, craned out the west door, and locked the remaining MMT1, SM, and latter half of MMT3. Corey has many more details, in particular from the East side: This afternoon the crew went about clamping HAM1's optics....in a new way. Generally, the IOT1 & ISCT1 meatlocker/table are moved out of the way and we install platforms to access the table. This time we tried a new method: keep everything in place, remove a HAM door (keep it out of the way and suspended from crane), work on HAM Table, re-install door, and then move to the other side of the chamber. One thing we didn't plan was a platform to work on. So reaching optics was certainly a pain. East Siiiide Worked on this side first (MC1, MC3 & "half of MMT3"). The belly bar was installed one set of holes higher than normal, and to reach these optics I did have to step on the Crossbeams ( generally a no-no), but not much weight was on the Crossbeams because my belly was on the belly bar. For MC1, I was able to visually confirm contact of all EQ stops tips on the mirror. For MC3, there was no way I was going to be able to visually confirm contact of all Stops, but I think it's secure. While on the East Side, I went ahead and contacted the four EQ stops to the chamfer (this is for MMT3). I did this because this side of the Optic will be a stretch from the west side.
The FMCS appears to be broken - hopefully due to a dead/dying 12v battery which is measuring ~9v. Most systems will continue to operate but with no communication to the control room. As a result there may be many alarms generated. Ski and I will monitor from home if there is anything to monitor.
Mitchell and Jim moved the eLIGO HAM Test Stand (Support Tube style) assembly to the South Bay West wall. Looks like pretty good compact storage mostly out of the way. The old location cutouts were protected with some sheet metal and replacement vinyl. The seem were taped. See the attached for the location of the new home and the scars from the old.
Removed optics for pointing into Ref Cav. Parts are stored in boxes temporarily on the PSL table, because the cabinet is full. The AOM and one BS cube are still bolted on the table, under ameristat, because I don't feel comfortable leaving them in boxes. Optics on the other side of the Ref Cav are still in place, but will hopefully be removed next week.
Dani, Corey to build more laser safety walls Kyle, Corey, Ski preparing to remove HAM1 door Gerardo to Mid-Y ~12:15local - Jodi, Kyle, Corey, others to HAM1 for door removal and clamp down of optics 13:20local – Michale R. out to H2 PSL to remove optics 13:30local – Dani, Sigg to Mid-Y to add squeezer lasers 13:40 – truck delivery for Dani – installed a new cabinet shortly thereafter 3:15 – Dani and Jonathan B. to End X to turn on the P-cal laser. End-X station is now the only laser-hazard area on-site ~3:30 – Mike L. and Patrick out to LVEA to lock down MMT1, MMT3, and SM in HAM1 The lockdown of the HAM1 optics continues at 4:15 local
Corey and I set up the temporary walls that will isolate the first phase of squeezer work being done in what I've tentatively named the East Bay Lab (EBL), to distinguish it from the squeezer setup that will move out of it after a few months. This area near HAM6 will potentially be used for ALS work after the squeezers are done with it. There is no operating laser currently behind the walls, so it's okay to walk back there without laser glasses. When we get to the stage where it becomes a laser hazard, the area will be properly marked, and a work permit and notification e-mail sent out. At that time access will be restricted to those trained on the squeezer setup. Note that the walls are not solid and are supported by tent-like poles. It's possible to knock them over by hitting them. Since they're all connected to each other, this can bring down the whole setup. We're looking at securing them to the floor, but in the meantime please be careful.
In an effort to get the vault seismic data back on the web. Cyrus and I have been working on the network to the vault. We have confirmed that the network fiber transceivers are functioning so the problem has to be with the Quanterra computer. This should not be too much of a surprise it has been running since 2000 in and environment that is not the best for computers. I have pulled the computer from the vault in an effort to get it repaired. These are not the channels that are in the DAQ. Those channels have been routed to the mid station and have other problems. COIL_MAGX is not functioning. Looks like a connection issue somewhere. Vault SEIS_Z is missing a gain of 10. This is an artifact of the 110B that we just do not understand fully. We will continue to work this issue.
Balanced and aligned the Main Chain of Quad-2 by raising the blade tips on the Top Mass and the UI Mass. Had to reset one of the Blade Clamp units, because the blade was touching the Z-Tip Adjuster and the blade tip was still low. Leveled the Main Chain Top Mass and UI Mass with a bubble level. The Test Mass is still about 1.5 – 2mm low. We removed the Penultimate and Test Masses from the Reaction chain to adjust the weights to account for the heaver glass masses. Increased the weight of the Test mass to 26130g and lowered the weight of the Penultimate Mass to 53139g. The combined weight for the Main Chain Penultimate Mass and Test Mass is 79268g and 79269g for the Reaction Chain. The Reaction Chain masses have been re-suspended and we are going through the balancing and alignment procedure.
1630 - Used heat gun to thaw econimizer valve, closed adjuster screw full cw then backed out 7 full turns ccw. Verified flow still present out silencer
Contractors moving equipment from EY to EX Pacific Industrial on site Overhead Door on site Richard fixed ADCUEX, which was red Betsy and Corey removed the bellows from HAM1 to ISCT1 Cyrus power cycled the NPT, which took the DAQ out for a few minutes Oscar baling on X-arm Richard re-routed vacuum connections, which took the LVEA vacuum channels out for a few minutes John and Mike L. installed a sock over the HAM1 chamber
Found Y-end QDP80 with "low N2 flow" alarm -> Investigation shows low pump shaft N2 flow due to near zero vapor pressure at LN2 dewar (pump shaft purge utilizes LN2 dewar boil-off which is nominally 10psi N2) -> "Economizer" valve (a.k.a. pressure relief valve) for this dewar has a history of sticking open and closed - see ilog entries from Jan. 2010 -> frost indicates economizer plumbing is flowing -> Turned adjuster screw 1 full turn cw -> will hold-off on continuing pumpdown of Y-end until normal shaft seal protection (flow) can be demonstrated.
Kyle- Removed all but minimal bolts from HAM1 east door
Kyle- vented Y-end Kyle, Ski- removed BSC10 south door. Then rehung door. Kyle-torqued door and pumped Y-end to 6 torr -> valved out pumps for the night will resume tomorrow.
0847 - Door ajar at EY, ok. 0930 - Mike L. gives tour of LVEA to visitor 0957 - Ryan and Joe from LLO arrive. 1000 - Richard and Cyrus at MX. 1026 - Kyle at EY, working on instruments there. Ignore vacuum alarms from EY. 1111 - EY SUS watchdogs begin to fire off 1250 - Door Forced, LVEA 1315 - Chris and Derrick from Apollo arrive 1345 - Gerardo heads to MY to drop off boxes 1400 - Noticing white pickup truck working on radio transmitter on Rt. 10 just past the driveway 1405 - Richard heads out to Vault 1405 - Cyrus out to MX 1456 - EY Optic Lock-Down Complete (Ski) 1503 - Door Forced, LVEA 1535 - Swagelok doing inventory work
Removed the Main Chain Penultimate and Test masses from Quad 2, and increased the static weight of both to 39634g. Reinstalled the masses and are going through the rebalancing alignment process.
Door off ~2:00PM Placed the ETMy on EQ chamfer stops The 4 (AR side) chamfer EQ stops were tightened to capture the ETM against the front 4 (HR side)chamfer stops. Magnets remained well centered in the OSEMs. The HR face of the optic was very pristine as was the transmon telescope large optic. The chamber floor had a few bits of AL foil and a couple of white cotton like fuzzballs. Door back on by 3:00PM
Finally got the support code for the weather stations, dust monitors, motor controllers, video and projector controls checked out of svn and compiled. Had to tweak the dust monitor code as expected. Had some weird issues about the paths in the dust monitor target directory. I'm not really sure how it was running at all from there before and it isn't now. The $TOP path used in the st.cmd shouldn't have existed the last few times I restarted it, but didn't seem to notice that until after I changed its support libraries to the svn checkout (which should have nothing to do with it). Anyway, the new code is running out of my home directory until tomorrow, when I can update the target directory. Note the running state of code for the weather stations, dust monitors, video and projector controls has been in differing states all late morning to evening. The laser power motor controllers are still down.
Never mind, the dust monitor code isn't running. I guess it needs more tweaking.
