JonathanB, PatrickT, RickS Following Doug Cook's instructions, we locked down H1 ETMX (RickS) inside the chamber by screwing in the four rear earthquake stops until the touched the chamfer on the rear of the ETM and nudged the optic up against the earthquake stops on the front face chamfer.
JonathanB, Patrick, RickS After locking down H1 ETMX, we proceeded to measure the optical efficiency from the photon calibrator output to the light incident on the ETM - basically just the viewport transmission. Measurements were made about 35 cm upstream of the ETM using the Woring Standard power sensor (integrating sphere and InGaAs PD). We did not use the TEC controller due to cable length issues. We used the Pcal internal power monitor (PM)as a laser power reference. We measured the PM voltage using a Keithly 2100 VOM connected to the Blue Box PD out. The WS voltage was measured in the usual way. Typical measurements were two minutes long with one sample every 25 ms. The H1ETMx pcal beams do not cross, so the Pcal refl beam impinges on the mass on the -y (east) side. For the in-chamber measurements, the WS/PM ratios were: Pcal refl beam: 0.2788, 0.2781; avg = 0.2785 Pcal trans beam: 0.2828, 0.2831; avg. = 0.2830 Before going into the chamber, we measured the WS/PM ratios with the WS located inside the Pcal calibration box (just upstream of the vacuum window). Note that the TEC was used for these measurements. The ratios were: Pcal relf beam: 0.3239, 0.3190; avg. = 0.3215 Pcal trans beam: 0.3253, 0.3201, 0.3176; avg. = 0.3210 After the in-vacuum measurements, we repeated the external measurements, but this time without using the TEC. The results were: Pcal refl beam: 0.3159, 0.3145; avg. = 0.3152 Pcal trans beam: 0.3168, 0.3176; avg. = 0.3172 Using the data taken wihout the TEC (we don't expect it to make a difference, but just in case ...) we get for the optical efficiencies: Pcal refl beam: 0.884 Pcal trans beam: 0.892 The optical efficiencies, for slightlyl different positions on the ETM, thus slightly different incidence angles were measured in Oct. 2007 (just after S5) to be 0.902 and 0.912. Thus the optical efficiencies measured today are almost 2% lower than what we measured 3 years ago.
Kyle-vented X-end Kyle, Ski-removed BSC9 east door
Work today included:
The dust monitor by HAM1 that was used during the lock down of the earthquake stops has been removed. Location 8 has been given back to the dust monitor behind 1x22, which has been turned back on. This dust monitor has a temperature and humidity readout.
*Did not stop Y-end rotating pumps Friday evening as logged. Instead, I stopped the purge air and QDP80 pumps this morning* No flow out dewar exhaust line, pressure now on scale but still not high enough -> Backed adjuster screw on economizer valve 1/2 ccw and flow started -> I will adjust this 1/2 turn cw every 24 hours until dewar vapor pressure reaches 10psi then should be able to pump Y-end VE without "low N2 flow" warning.
Received text message alarm about well pump. Came out to site this morning. Well pump not running and no tank overflow occuring. FMCS still not operating correctly, but will investigate further.
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
