1. Steve Lewis Gas Attenuator PDRsalewis@llnl.gov 11 December 2006 1 Instrumentation & Controls Steve Lewis 11 December 2006 LCLS Gas Attenuator Preliminary Design Review

2. Steve Lewis Gas Attenuator PDRsalewis@llnl.gov 11 December 2006 2 Design and Layout Use of LCLS Standards EPICS PLC (hardware and software) Design Process Suitable hardware chosen by consensus Signals counted and assigned to I/O blocks (PLC, VME) Flow-down requirements derived for PLC, IOC, racks, and network gear

3. Steve Lewis Gas Attenuator PDRsalewis@llnl.gov 11 December 2006 3 EPICS (LCLS-provided): Device drivers Device-level GUI elements All other tools and utilities (Warm Start, Data archiving, etc) EPICS (LLNL-provided using guidelines) Names P&ID-level GUI elements Sequences New configuration for Turbomolecular pump controller communications (serial)

4. Steve Lewis Gas Attenuator PDRsalewis@llnl.gov 11 December 2006 4 Gas Detector and Gas Attenuator vacuum and gas-flow controls are treated as a single entity PLC provides basic interlocking EPICS sequences choreograph transitions between major states (vacuum-all-through; detectors-only; detectors-and-attenuator; etc) Gas Attenuator command and monitor PVs will be available to experiments (XES/LUSI) PLC reports to MPS for critical items

5. Steve Lewis Gas Attenuator PDRsalewis@llnl.gov 11 December 2006 5 Apparatus Temperature Measurement Temperature EPICS Control System (includes PLC) On/Off, Pressure Vacuum Pumps, Gauges, Valves Gain,,Temp,HV DC Bias+ Cooling+Preamp Digitizer Signal Trigger Gas Detector: Block Diagram X,Y,dX,dY,dZ Motion Control Position Motor+ Encoder Power Supply On/Off, Current, Voltage Magnet 5 On/Off, Pressure Gas Pressure Controller Avalanche Photodiode Shape Shaping Amplifier Digitizer Signal Trigger Photodiode Shape Shaping Amplifier Digitizer Signal Trigger Photomultiplier Tube Filter Motion Control Selection Motor+ Encoder Voltage, Current HV Power Supply Note: 2 units required Trigger source not shown Digitizers may be common 2

6. Steve Lewis Gas Attenuator PDRsalewis@llnl.gov 11 December 2006 6

7. Steve Lewis Gas Attenuator PDRsalewis@llnl.gov 11 December 2006 7

8. Steve Lewis Gas Attenuator PDRsalewis@llnl.gov 11 December 2006 8 Ethernet IOC Gauge ControllerMass Flow ControllerTurbo Pump Controller Analog and Digital Signals Beamline Gate Valves Mass Flow Unit Turbo Pumps Pirani + Cold Cathode + Baratron Gauges Gate Valve I/O Ethernet Interface ControlNet Interface Flex I/O ControlNet Scroll Pumps Scroll pump control Serial interface GUI PLC RS-232 Magnetic Starter Ladder Logic Server RS-232 Ethernet Interface ControlNet Interface