1. An example: recovering from a leak in a vacuum joint of the storage ring
Action
People
Time [h]
Shutting down the SR 2 1
Removing the SR ceiling
Filling the dewar with liquid nitrogen
0.5
Switching off local instrumentation and power supply
Moving the pumping stations, dewar and mechanical tools to the SR
1+2
Dismounting/ remounting flanges, replacement of joint
Starting vacuum and leak test
1.5
Starting bake-out of ion pumps
Bake-out (ion pumps only) 16
Action
People
Time [h]
Switching off the bake-out and cooling 1 2
Discharging the ion pumps, switching on the power supply and instrumentation
1.5
Removing the pumping stations, dewar and mechanical tools from the SR
2+2
Closing the SR ceiling
“Searching” operation
0.5
OLAV Workshop CERN, April 11–
* People external to the vacuum group