camilla.compton@LIGO.ORG - posted 10:55, Tuesday 22 April 2025 - last comment - 15:33, Tuesday 22 April 2025(84048)
All ISC components ready to go back onto HAM1
Camilla, Jennie W
Finished getting all the ISC components ready to go back onto HAM1, previous alogs 83945, 83875, 83858.
Last steps were to replace all remaining black glass v-shaped beam dumps with DLC coated SS (Alena sent us more D1800140-v1-01/02). This was 6 beamdumps: BD1, BD6a, BD11, BD13, BD14 and BD16. The glass was very tightly wedged into BD6a, so I removed the hole v-holder and swapped with a new one.
Both the lower and upper periscope mirror were dusty, the LPM in particular (photo), so we pulled those out, top-gunned and first contacted. Both were labeled E1000425-v3.
When we went to replace them, we noticed v. small shards of black glass by the UPM. I decided to replace the black glass with the piece removed from M15 to avoid any shards dropping onto the LPM. When I removed the black glass beam dump you could see it was broken at the bottom with a piece still in the clip holder (photo), maybe from over-tightened metal screws.
Now everything is ready, on the rack in the HAM3 cleanroom.
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