(Betsy, Corey, Keita, Koji & also some photos by Richard M)
Following up on alogs from Keita & Koji, photos from yesterday's work has been uploaded to resourcespace and can be found here:
https://ligoimages.mit.edu/?c=1696
(There's 91 photos. I did not upload blurry photos.)
I'm attaching highlight photos to this alog & they are roughly numbered in the order taken:
- M14 (was removed to blow particle off)
- Fingerprints on NW corner of shroud
- V-beam Dump (on/near QPD sled on northern part of table) with major damage on both pieces of glass
- Burn hole at entrance aperature on the shroud glass for OMC
- Photos of damage on V-Beam Dump after pulled out and on inspection table.
- Photos of damage on V-Beam Dump after pulled out and on inspection table.
- Photos of damage on V-Beam Dump after pulled out and on inspection table.
- Action shots of Betsy/Koji & OMC removal
- Action shots of Betsy/Koji & OMC removal
- Action shots of Betsy/Koji & OMC removal
- OMC PZT mirror with burn mark
- OMC PZT mirror with burn mark
- Particle contaminants on OMC Breadboard
- Delaminated epoxy on one of the "tomb stones"
> 4. Burn hole at entrance aperature on the shroud glass for OMC
Today, we took out the black glass panel with a burn hole from the OMC shroud.
The attached close-up photo shows the burn hole above the entrance aperture to the OMC. Also, you can observe many more craters.
As we are going to install the replacement panel, we wonder what was the cause of these misaligned craters and what was the difference between the small craters and the biggest burn hole.
~10:00AM WED AUG 4th, 2016 - Chamber entrance Particle counts with hand held CC counter:
| Particle size | Outside of chamber cover, in CR | In chamber above table |
| 0.3um | 70 | 0 |
| 0.5um | 20 | 0 |
| 1.0um | 10 | 0 |
~1PM WED AUG 4th, 2016 - Chamber entrance Particle counts with hand held CC counter:
| Particle size | Outside of chamber cover, in CR | In chamber above table |
| 0.3um | 0 | |
| 0.5um | 0 | |
| 1.0um | 10 |