Reports until 18:12, Wednesday 23 April 2025
LHO VE
janos.csizmazia@LIGO.ORG - posted 18:12, Wednesday 23 April 2025 (84099)
2025 April vent - VAC diary
4-22 (Tuesday) activities:

- After reaching ~1.3E-6 Torr at the corner, GV2 was opened (the corner was valved together with the X-manifold), that brought down the pressure to ~9E-7 Torr in ~2 hours
- The aux carts from GV5, BSC8, and HAM4 have been detached, 2 of them have been staged at HAM1/HAM2 as a preparation for the pumpdown of the annulus volume

4-23 (Wednesday) activities:

- The stiffening frame for the 1000 amu RGA is being built
- The filter elements were replaced in the EX clean air supply, and it is now running for 24 hours, with a vent valve open in the VEA