Mono Box Vacuum System

Venting

1. notify CHESS operator that you are going to vent the mono box
2. turn off cold cathode gauge controller (ops area, below control computer)
3. close the valve on top of the turbo pump
4. turn on the thermovac gauge
5. turn off the turbo - the controller will vent it on its own
6. vent the mono box
• open valve below the N2 pressure gauge, until overpressure valve opens
• open valve at box
• watch thermovac gauge
• close box valve at 760 Torr
• close N2 valve
7. dismount thermocouple gauge on mono box front door, cap KF flange
8. disconnect turbo KF, blank off turbo KF flange, cap KF flange on door
9. remove mono box front door
10. leave N2 flow going while door is off

Pump-Down

1. close N2 flow through mono box
2. re-install door
3. mount thermovac on KF
4. reconnect turbo
5. remove plug of valve control box from interlockes outlet and plug it into a regular power outlet
6. open turbo valve
7. turn on thermovac gauge
8. start turbo and watch roughing of the box until turbo starts up (about half an hour)
9. check vacuum every couple of hours
10. when pressure below 1e-4 Torr on pump, switch off thermovac, turn on cold cathode gauge
11. when cold cathode gauge reads 1e-4 solidly, put turbo valve back into the feedback:
• close turbo valve
• plug valve controller into interlocked outlet
• open turbo valve
12. reset main interlock box in ops area