Reports until 18:30, Thursday 03 April 2025
LHO VE
janos.csizmazia@LIGO.ORG - posted 18:30, Thursday 03 April 2025 - last comment - 01:31, Monday 07 April 2025(83738)
2025 April vent - VAC diary
Today's activities:

- HAM1's Y+ and Y- doors have been taken off (thanks to Tyler, Randy for the help in the door removal, and to Tony and Corey for breaking the bolts earlier)
- All 5 HAM1/HAM2 viewport covers have been installed
- The 16.5" flange was taken off from the top of HAM1 - this will be the basis of the new vacuum interlock gauge
- A high number of leak checking was done, in detail:
 - Y-manifold: Y+ X+ side flanges (3 pcs.); Turbo flange (1 pc.)
 - BSC8: Y+ X+ corner (3 pcs.); Y- X+ corner (3 pcs.); X+ HEPI bellows (2 pcs.); X+ collar 16.5" flanges (2 pcs.)
 - BSC8-BSC1 spool: Y+ X+ flanges (3 pcs.)
 - BSC1: Y+ X+ side flanges (3 pcs.); X+ collar flanges (2 pcs.); X+ HEPI bellows (2 pcs.); X+ door flanges (5 pcs.); Y- X+ side flanges (3 pcs.)
 - BSC2: Y+ X+ side flanges (3 pcs.)
 - BSC3: Y+ HEPI bellows (2 pcs.); Y+ X- side flanges (3 pcs.); Y+ collar flanges (2 pcs.); Y+ door flanges (5 pcs.); Y+ X+ side flanges (3 pcs.)
 - HAM2-HAM3 spool: vent port (1 pc.); X- flanges (11 pcs.); Y- side flanges (2 pcs.); X+ Y- flanges (5 pcs.)
 - HAM3: Y- door flanges (5 pcs.)
Comments related to this report
gerardo.moreno@LIGO.ORG - 01:31, Monday 07 April 2025 (83763)VE

(Travis, Tyler, Randy, Jordan, Janos, Gerardo)

Something to note during the removal of the -Y door for HAM1, a hair (see attached photo) was found embeded on one of the annulus o-rings, good eye Travis.  Maybe we are due for a contamination control refresh.

Images attached to this comment