janos.csizmazia@LIGO.ORG - posted 17:40, Thursday 08 May 2025 - last comment - 17:14, Friday 09 May 2025(84331)
GV7 was temporarlily opened
Gerardo, Jordan, Janos GV7 (X-arm manifold) was opened today, to make possible HAM1 optical alignment. 13:06 - all the turbos were valved out 13:12 - the gate valve started to move up After ~4 hrs, PT-144 (vacuum gauge next to CP2 on the beamtube side) is at 3.7E-8 Torr, the pressure in the corner is <1E-7 Torr. GV7 stays open overnight, then tomorrow there will be some more alignment work (following aLog 84323), and then GV7 will be closed again. The turbo pumps are still running, and after GV7 is closed, they will be valved back to the corner. The RGA (p-t) scans of the main peaks will be posted - in particular during the closure and the opening of GV7
(Travis S., Gerardo M.)
Gate valve 7 was closed today at 12:45 PM, OK was given by Camilla, instrument air pressure at GV7 set at 15 psi. All turbo station were valved in after. RGA system at the corner running and collecting data.