matthew.heintze@LIGO.ORG - posted 20:39, Saturday 19 July 2014 - last comment - 14:34, Friday 01 August 2014(12871)
HAM3 SUS and ISI unlocked---back to Hugh for more testing
Calum, Rich A, Kate G, Matt H
More detailed report to come, but Hugh indicated to me that his TF's werent finished when I unlocked this morning. Thus we concentrated on HAM3 and have got the suspensions FC'd, chamber cleaned, everything back in place, Suspensions unlocked, ISI unlocked, covers pulled back.
Hugh its over to you for more testing. Have fun
So slightly more detailed report:
After face stops of suspensions locked and thebaffles removed, we tried to put on the bolt on first contact cones. I had forgotten that the face stops of the optic for the HSTS's had to be removed to use the cones. So I had to lock the barrel stops of the optics and then remove the face EQ stops.
There were a couple of issues with first contacting (and other things like me forgetting to take off EQ stops)...I believe Kate/Calum may be writing a more detailed report on that so hope people dont think I am stealing their thunder. One issue saw at times is the "cobwebing" that we see the first contact do when sprayed on (see pics below...this shows one single spray into the cone on the PR2 optic). May be a combination of RH compared to mixture ratio here at LHO (pure speculation at this stage on that with absolutely no evidence on my behalf to back this up) as dont ever recall seeing it like that at LLO when we first contacted optics. Some experimentation with slightly altering mixture ratio was done and seemed to solve the issue for the most part which ebabled us to get a good first contact layer and so was able to progress and get optics successfully first contacted.
After FC was sprayed and an outer crust applied by painting an outlet layer at the edge, I bolted the face EQ stops back on, released the optic barrel EQ stops, baffles were put back in place, a clean of the chamber took place and the suspensions and ISI were unlocked.
Particle counts for afternoon session:
In cleanroom
All zeros
In chamber start of session:
0.3um....620 counts
0.5um...200 counts
0.7um....130 counts
1.0um...90 counts
2.0um...30 counts
5.0um...10 counts
Note: Baffle work has been happening in BSC2 for the last few hours probably stirring up particulate
Photos attached if people interested in temps/RH