Steve Lewis Gas Detector 6 December Instrumentation & Controls Steve Lewis Paul Pax Elden Ables 6 December 2006 LCLS Gas Detector Preliminary Design Review

Steve Lewis Gas Detector 6 December Design and Layout Use of LCLS Standards Top-level Diagram Replicate Two Identical Sections Design Process Suitable hardware chosen by consensus Signals counted and assigned to I/O blocks (PLC, VME) I/O blocks assigned to PLCs and IOCs Network requirements derived

Steve Lewis Gas Detector 6 December Uses LCLS Global Standards EPICS (LCLS-provided): Some device drivers Device-level GUI elements All other tools and utilities (Matlab, StripCharts, Data archiving, etc) EPICS (LLNL-provided using guidelines) Names P&ID-level GUI elements Sequences New device drivers (digitizer)

Steve Lewis Gas Detector 6 December 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

Steve Lewis Gas Detector 6 December Uses LCLS Global Standards 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 Detector processed measurements will be fed to experiments (XES/LUSI) and elsewhere via timing system (per pulse) as well as via PVs (slow) PLC reports to MPS for critical items

Steve Lewis Gas Detector 6 December Gas Detector Photodetectors Photodiode Advanced Photonix SD444 Active area: 100mm 2 350nm: 0.11A/W Max dark current: 52 nA Photomultiplier Tube Hamamatsu R1464 Active area: 177mm 2 350nm: 4.9x10 3 A/W Max dark current: 20 nA Avalanche Photodiode Advanced Photonix SD444 Bare detector specs: Active area: 78.5mm 2 350nm: 45A/W Max dark current: 35 nA

Steve Lewis Gas Detector 6 December Photodetector Signal Levels PMTAPDPD Noise Floor Saturation Hard X-ray signal range Soft X-ray signal range Bare APD Noise Floor APD Module Noise Floor APD Module Saturation