(Travis S., Jordan V., Richard M., Gerardo M.)
After the installation of CHeTA viewports, we connected an ISP-1000 scroll pump and a SS-500 cart to each of the main turbo pumps at the X beam manifold and Y beam manifold. After getting power sorted out to the ISP-1000s, thanks Richard, we started the pumpdown for both of the manifolds.
Something that we did noted was the new gauge for PT-180 shows almost 1000 Torr for pressure at atmosphere, this is not correct, then the other gauge for PT-170 shows 750 Torr for pressure at atmosphere, also not right.
Pumpdown has been stopped at the end of the day, and will be restarted tomorrow morning by Jordan.
Attached is a plot of both manifolds initial pumpdown.
Continued pumpdown of the XBM and YBM this morning, using 1x ISP1000 and 1x ISP500 for each volume.
| Starting Pressure: 45 torr | Start Time: 8:25 am |
| Turbo Crossover Pressure: 500 mtorr |
Turbo On: 3:10 pm (XBM) 3:25 pm (YBM) |
Total roughing time was ~ 10 hours, 3 hours and 15 minutes yesterday + 6 hours and 45 minutes today.
Once the turbopump reached full speed and chamber pressure was ~5E-5 Torr, I transitioned from the roughing pumps to the dedicated ISP250 and 80 l/s turbopump for the foreline.
Cooling water was adjusted so that pump and controller temps were ~40C. Setpoints adjusted to 1E-5 Torr.
We will need to leak test the 3 newly installed viewports before opening gate valves.
We leak checked the 3 ports which had viewports installed. Ports: YBM: A-1F VP3 and XBM: A-1C VP2 and VP4
We first removed viewport covers and bagged the viewport flanges leaving the conflat seal exposed, since the viewports are o-ring sealed and were previously leak tested.
No helium signal was observed above the leak detector background ~2E-10 Torr-l/s.
(Jordan V., Travis S., Robert S.)
Both gate valves, GV1 and GV2 were opened today, no issues encountered during the operation of both large gate valves. Robert was there to listen to the stroke of the large gate valves, GV1 does make a little bit of noise, but GV2 doesn't make noise. Attached is a plot of the pressure response at BSC2, corner vacuum volume is being pumped by two turbo pumps, XBM and YBM now. Dave B. on the controls to take care of the alarm settings, thanks Dave.
