1. Vacuum Controls Stephen Schuh Tom Porter 25 October 2006

2. Outline Requirements Block Diagram External Interfaces Design Maturity
Hardware Status
Software Status
Schedule
Testing Program

3. Requirements Use existing controls for linac vacuum hardware
Remote control and status in EPICS for all new hardware
Local control and status for all new hardware
Interlock gate valves with gauges
Notify MPS when a gate valve is not open
Shut off klystron modulators when waveguide pressure exceeds a threshold
Close all valves in a PPS region if that region is set to controlled or permitted access

4. Block Diagram

5. External Interfaces
Valve status to MPS: Shut off beam when valve is not open
(MPS ICD, Vacuum Controls ESD)
Waveguide vacuum status to modulator: Shut off modulator when WG vacuum is bad
(Vacuum Controls ESD)
Access state from PPS: Close valves when in controlled or permitted access

6. Design Maturity Vacuum safety review – September 2005
Safety review of all vacuum components
Audience: Vacuum experts and safety experts from several SLAC departments
Internal design review – November 2005
Early review of vacuum controls plan
Audience: SLAC controls department
Vacuum Controls Requirements document – March 2006
Final design review – April 2006
Review of vacuum system controls hardware
Audience: Control system experts and vacuum experts from SLAC

7. Hardware Status Date Needed: January 2007 Progress to date:
Assembled test stand: PLC, gauge controller, pump controller, IOC
Installed all long haul cables
Procurement and bench testing of COTS vacuum controllers finished
Most equipment installed in racks in Sector 20 (exceptions: PLC crates, valve control panels)
Intra-rack wiring complete
Remaining work:
Make and install vacuum pigtail cables (in progress)
Install PLC crates in Sector 20 (when programming complete)
Fabricate valve control panels (in progress); install in Sector 20
Install wiring to provide vacuum interlocks to RF system

8. Software Status Date Needed: January 2007 Progress to date:
Software requirements determined (Vacuum Controls ESD)
EPICS device support mostly complete:
EPICS ↔ PLC: done (using ether-ip from SNS)
EPICS ↔ Vacuum Controllers: nearly done (using streamdevice from SLS)
Test stand PLC programming in progress
Test stand IOC development in progress
Remaining work:
PLC programming (in progress)
EPICS databases and EDM screens (in progress)
System testing (formal test plan to be written)

9. Schedule

10. Testing Program Vacuum equipment bench testing mostly done
Pump controller load tests
Gauge controller tests
Valve control panels will be tested when delivered
Intra-rack wiring mostly tested
Most intra-rack wiring was tested before the racks were sent to Sector 20
Remaining wiring will be tested after PLC crates are installed
System testing to be done in December
All PLC interlocks will be tested after PLC programming is finished
Detailed testing procedures not yet developed
End to end testing in January-February