Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot requested from 5 PM March 3 to 5 PM March 4. Also attached are plots of the modes to show when they were running/acquiring data. Data was taken from h1nds1. 1440.0 minutes of trend displayed
LVEA laser safe all day. -Technical cleaning crew working on BSC2 and BSC6 -Apollo installing feedt-throughs on BSC10 -Michael R restarted PSL -Hugh wandering LVEA making HEPI inspections -Platt Electric delivery for Richard M -Travis working in HAM2 (1030) -Maya Angelou Elementary tour of the site; interesting questions asked and answered -Thomas V in LVEA doing SLC inventory (1330) -Jim B to LVEA to check cabling on H1PEM -Corey G installing power supply on IOT2L
Lower level garbing/staging cleanroom moved into place and central curtain installed Dome bolts removed 2nd cleaning at BSC2 Dome bolts removed (Additional cleaning complete.) Leg jacks tested Work on crane rails complete Baffle assembly (work tables craned over beam tube, cleaned, moved into cleanroom) Still need to: Remove dome Check chamber cleanroom function Stage garbing/staging cleanrooms
The laser shut off over the weekend due to the power watchdog tripping. It looks like I had set the watchdog on the laser when the humidity was relatively high, and once the weather changed the humidity dropped back down and tripped the laser. We really need to look into this since the majority of shutdowns have been due to this humidity issue.
I took the opportunity to increase the current on the pump diodes to get us back to nominal power. The changes made are as follows:
I lowered the current on diodes 3/4 to 53 A after I got a bit more power out of diode 3, by decreasing its temperature to 20 C.
Also decreased the AC units to 20 C (unrelated) to try and stabilize room temperature for IO.
This is from Friday morning.
With Jodi's help, I vacuumed the upper surfaces of the ISI. I found a fair amount of particulate, most of which appeared to be metallic flakes, though there was the occasional black fleck.I didn't think to get samples, but there are probably still specks to be collected, there's a lot of ground to cover. Most of what I found was collected in up-facing recesses in the plates, especially around the vertical L4C's. I also wiped down the keel and the larger exposed upper surfaces of the stages. Additionally, I found a bug that had crawled into the vent for a dowel pin and died, which I extracted by flushing with a large quantity of isopropyl.
Wow! Did you save the carcass so that we can ID the bug?
Cheryl reported that MC1 and MC3 were badly pitched relative to the last time she worked with them. Trending the M3 level signals shows that it went bad at about 20:30 UTC (12:30 PST) on Tue 2/19, possibly in connection with the removal of dummy masses in preparation for installation of PR3 and PRM (alog 5527). Travis looked and didn't find anything obviously touching, so Cheryl is going to check the table levelness. Then we'll do another round of TFs to confirm that it's fixed or provide further clues.
I looked into the HAM ISI sensors and found that they also show changes from before the temporary weights were removed to after both PR3 and PRM were installed, which does indicate that changes to MC1 and MC3 could be caused by ISI changes. The plot shows the March 18, 6AM to March 22, 6PM, so covers all the HAM2 weight changes during the week.
Attached are HEPI trends showing maximum excusion during the unweighting/reweighting period. None exceed 200 counts (.0003"). After reloading the table with the suspensions, the largest change is ,0.0001"
Just for future reference, the conversion for the HAM cps's is about 800cts/.001", according to the HAM Integration Testing Procedure. The biggest shift is ~1000cts, so about 1.25 milli-inches, which is basically the slop in the lockers.
The dust monitor in the clean room over the test stand with the beam splitter had a low battery alarm and had stopped counting. I replaced the fuse and restarted it.
The pressure in the HEPI Hardlines have been constant at 125psi since Wednesday afternoon after repairing the small leak at HAM4. I did not check the gauge over the weekend but today it remains at 125. The hardlines will be vented next and a few changes made: add pressure transducers at BSC2 and a drain valve under BSC1. Then let the filling begin!
Installed: - all baffles are on the table in a position that will only change slightly to align to the beam - all dog clamps are swapped/added on all components, except - IM1-3 dog clamps have been OK'd by Guido, but Calum wants to,see BK hammering test data, however - IM1-3 sus vs sys dog clamps are likely about the same weight, and IMs aren't moving To Do: - vet sus dog clamps with BK hammering test Desired work: - if possible, float and ballance the table and relock, to vet the table alignment and elliminate it as a block to locking the IMC in air
I installed irises on the PSL in January, and looked at them yesterday. I found that the beam coming from the PMC is about a beam diameter from center on it's alignment iris, and the transmitted beam from the bottom periscope mirror was also about a beam diameter from center. Attached is a drawing of the beam paths for these two irises, and where I found the beams.
A possible explanation for the alignment drift might be that the shutdown of the PSL chilled water has caused some thermal motion either of the PSL table or some components on the table. I would expect some watercooled components are thermally anchored to the table so even small changes in termperature might cause some local deformation of the table surface. There may be large time constants associated with this.
- Deepak, Jeff K, Keita, Cheryl A lot of activity around HAM2 today, working toward locking the IMC in air. The IMC is ready to go, in HAM2 and ISCT2L, but we have an alignment issue from the PSL that will require the PSL top periscope mirror and the HAM2 Pico Motor actuated mirror to correct, before we can resume IMC flashing and locking. When we went to laser hazard, I saw that the beam from the PSL was misaligned to the HAM2 periscope. Iterations of aligning the PSL beam to the IMC alignment irises were unsuccessful, in that there is no way to align the input beam with just the top periscope mirror, and get a beam through the IMC that is centered on all the irises. Many different attempts to rectify this were all unsuccessful, including significant realignment of IMC mirrors. While in the PSL, I checked my alignment irises and found that two of the irises on the PSL no longer have a centered beams,, both by about a beam diameter, so there has been some significant beam pointing change. This means that aligning the PSL beam to the IMC will require the use of the top periscope mirror in the PSL, and the pico motor mirror in HAM2. Other details on HAM2/IMC work: IOT2L electronics were reattached and signals are coming through. The table is sitting further from HAM2 than normal, since it gives us more room in the clean room, and REFL PD is not adversely effected by the additional distance. The IMC REFL beam is aligned to the table, and we have a beam on REFL PD and can see the beam on the camera. The semi-end of baffle installation/rework was today. Jeff K, at my OK, used iLigo dog clamps on two baffles, HA1 and some other one he alogged - pictures to come. Deepak and I installed the IM4 baffle. There were a couple issues with the IM4 baffle, which are that it cannot be installed without loosening the EQ stop brackets, and when the EQ stop brackets are retightened, they are in direct contact with the baffle. Picture attached. IMC alignment irises were assembled and installed in HAM2, back to their locations from Dec. 2012, in front of MC1 and MC3, and behind MC3. This fully defines the input beam used for the alignment of the IMC in air. LVEA is back to laser safe. HAM2 West door is rocking a 4-door-cover look to allow the IMC REFL to escape the vacuum system without exposing more of the chamber than necessary.
When you press some button in any MEDM window to open another MEDM window, and if that screen is already open somewhere but behind another window, in KDE the correct window pops up to the front.
Cheryl V, Jeff K, Keita, Deepak K
The offsets of the Mode Cleaner Suspensions are currently at
MC1 Pitch : -360
MC1 Yaw : 420
MC2 Pitch : -9.8
MC2 Yaw : 367.9
MC3 Pitch : 710
MC3 Yaw : 220
- Clean room moved from BSC10 to BSC6 - Feed throughs being installed - Transition to laser hazard by IO - PEM timing fix requires reboot of H1OAF - Dust monitor vendor on site - EY transfer function on SUS in BSC6
