Vacuum Controls Stephen Schuh Tom Porter 25 October 2006

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

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

Block Diagram

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

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

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

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)

Schedule

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