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Instrumentation & Controls Steve Lewis Paul Pax Elden Ables 6 December 2006

Instrumentation & Controls Steve Lewis Paul Pax Elden Ables 6 December 2006 . LCLS Gas Detector Preliminary Design Review . Design and Layout. Use of LCLS Standards Top-level Diagram Replicate Two Identical Sections Design Process Suitable hardware chosen by consensus

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Instrumentation & Controls Steve Lewis Paul Pax Elden Ables 6 December 2006

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  1. Instrumentation & ControlsSteve LewisPaul PaxElden Ables6 December 2006 LCLS Gas DetectorPreliminary Design Review

  2. 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

  3. 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)

  4. Gas Detector: Block Diagram EPICS Control System (includes PLC) Note: 2 units required Motor+ Encoder HV Power Supply X,Y,dX,dY,dZMotion Control Voltage,Current 5 Position Shaping Amplifier Shape Motor+ Encoder Filter Motion Control PhotomultiplierTube Signal 2 Selection Trigger Digitizer Magnet Photodiode Power Supply Shaping Amplifier On/Off,Current, Voltage Shape Signal Vacuum Pumps, Gauges, Valves Trigger Digitizer On/Off, Pressure Trigger source not shownDigitizers may be common Gas Pressure Controller AvalanchePhotodiode DC Bias+Cooling+Preamp On/Off, Pressure Gain,,Temp,HV TemperatureMeasurement Temperature Signal Trigger Apparatus Digitizer

  5. 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

  6. Photodiode Advanced Photonix SD444 Active area: 100mm2 Response @ 350nm: 0.11A/W Max dark current: 52 nA Photomultiplier Tube Hamamatsu R1464 Active area: 177mm2 Response @ 350nm: 4.9x103A/W Max dark current: 20 nA Gas Detector Photodetectors • Avalanche Photodiode • Advanced Photonix SD444 • Bare detector specs: • Active area: 78.5mm2 • Response @ 350nm: 45A/W • Max dark current: 35 nA

  7. Photodetector Signal Levels PMT APD PD APD Module Saturation Saturation Soft X-ray signal range Hard X-ray signal range APD Module Noise Floor Bare APD Noise Floor Noise Floor

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