Reports until 13:26, Tuesday 05 March 2024
LHO VE
janos.csizmazia@LIGO.ORG - posted 13:26, Tuesday 05 March 2024 - last comment - 18:21, Tuesday 05 March 2024(76129)
3-5 vent vacuum diary
Today's activities:
- EX gate valve (GV20) was OPENED. The pressure there is already 7.8E-9

- At the Corner, after the large IP controllers were replaced yesterday, the pressure was dropping continuously. As the IP data is not in the CDS (yet, because of swapping the controllers), see the attached pictures of the pressures directly at the IP orifices, at different times
- The main GVs (GV5; GV7) have been OPENED. The pressure is dropping nicely, it is currently at 7.5E-8 at the center
- All the turbo pumps (HAM6, OMC, Y-manifold, X-manifold) were valved out before/during GV openings

- HAM8 RGA will be ready for taking scans tomorrow
- HAM7 turbo was valved out, and it was also valved together with the short FCT section between BSC3 and HAM7 (FCV1 OPENED). The pressure rose a bit, but it is still at ~3.2E-7
- The pumping of HAM7 RGA was stopped, the cart was taken away
- FCT further schedule: after HAM8 RGA scan was done - and it is satisfactory - the whole relay tube - HAM7 - HAM8 line will be valved together and into the main volume (opening RV1, FCV2, FCV3, FCV4, FCV7, FCV8), and HAM8 turbo will be valved out. This will happen tomorrow (3-6)

In the rest of the day, the vacuum team will switch off turbos and clean up in the LVEA.
And, there will be some pumpdown statistics and summary posted to aLog later on.
Images attached to this report
Comments related to this report
janos.csizmazia@LIGO.ORG - 16:51, Tuesday 05 March 2024 (76134)
One useful additional info: both for GV5 and GV7 50 psi was required to open up
janos.csizmazia@LIGO.ORG - 18:21, Tuesday 05 March 2024 (76139)
The Turbo stations in the LVEA and at EX are now switched off. The details:
X-manifold:
Bearings: 100%
Turbo hours: 1948
Scroll hours: 1945

Y-manifold:
Bearings: 100%
Turbo hours: 950
Scroll hours: 2278

OMC:
Bearings: 100%
Turbo hours: 5963
Scroll hours: 5902

EX:
Bearings: 100%
Turbo hours: 1091
Scroll hours: 7141