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Loss Monitors

SwissFEL Diagnostics Review, 2013-03-05 Loss Monitors Rasmus Ischebeck, Florian Löhl, Nick Schlumpf. Loss Monitors. Task: Measurement of electron beam losses for wire scanners (see Gian Luca’s presentation) for machine protection Personnel protection system uses different monitors

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Loss Monitors

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  1. SwissFEL Diagnostics Review, 2013-03-05Loss MonitorsRasmus Ischebeck, Florian Löhl, Nick Schlumpf

  2. Loss Monitors • Task: Measurement of electron beam losses • for wire scanners (see Gian Luca’s presentation) • for machine protection • Personnel protection system uses different monitors • Wire scanners: differentiate first and second bunch, and dark current • Technical Requirements • Operational Requirements • Read-out at 100 Hz • Connected to synchronized data acquisition • Connected to machine interlock Rasmus Ischebeck, SwissFEL Diagnostics Review: Loss Monitors 2

  3. Distribution in SwissFEL • 52 Loss Monitors: • 23 wire scanners • 29 distributed loss monitors for the machine protection system Rasmus Ischebeck, SwissFEL Diagnostics Review: Loss Monitors 3

  4. Work Package Status • Implementation of charge & loss monitors to be done by an engineer / physicist (open position currently advertised on the PSI web site) Rasmus Ischebeck, SwissFEL Diagnostics Review: Loss Monitors 4

  5. Measurement Principle • Localized loss monitors (for wire scanners) • Scintillators • Distributed loss monitors (for machine interlock) • Čerenkov light generated in quartz fibers • Calibrated detectors • RadFETs Detector Čerenkov Fiber Beam Pipe —> Lars Fröhlich Rasmus Ischebeck, SwissFEL Diagnostics Review: Loss Monitors 5

  6. Schematic View Rasmus Ischebeck, SwissFEL Diagnostics Review: Loss Monitors 6

  7. Design Considerations • Fiber-based system • Compact, low installation costs • All electronics outside the accelerator tunnel • We need a large dynamic range • Foresee to use vacuum PMTs • Digitization by fast ADC Rasmus Ischebeck, SwissFEL Diagnostics Review: Loss Monitors 7

  8. Implementation: Prototype installed in SITF • Prototype built from optical fibers, photomultiplier tubes and laboratory hardware Rasmus Ischebeck, SwissFEL Diagnostics Review: Loss Monitors 8

  9. Measurements with the Prototype Rasmus Ischebeck, SwissFEL Diagnostics Review: Loss Monitors 9

  10. Calibration of the RADFETS • Calibration at the Eichstelle at PSI Rasmus Ischebeck, SwissFEL Diagnostics Review: Loss Monitors 10

  11. Status / Time Plan Rasmus Ischebeck, SwissFEL Diagnostics Review: Loss Monitors 11

  12. Resources ⊠ Rasmus Ischebeck, SwissFEL Diagnostics Review: Loss Monitors 12

  13. Open Issues / Questions to the Committee • Please evaluate the presented solution with respect to • Suitability of the chosen concepts • Appropriateness of the design for the given specifications • Feasibility of the technical designs • Assess whether the presented time plans and resource planning is appropriate • Time plan • Material resources • Personnel planning • Is there a way to achieve the large dynamic range with semiconductor detectors? Rasmus Ischebeck, SwissFEL Diagnostics Review: Loss Monitors 13

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