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Diagnostics/Common Optics: Priorities, Engineering

This document outlines the distribution and monitoring of various components in the X-ray systems, including profile monitors, slits, pulse pickers, and attenuators. It also addresses the challenges and solutions in designing these monitors.

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Diagnostics/Common Optics: Priorities, Engineering

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  1. Diagnostics/Common Optics: Priorities, Engineering Facility Advisory Committee Breakout Session 3 – X-Ray Systems, Including LUSI November 11-13 2008 Yiping Feng – Instrument Scientist Eliazar Ortiz – Lead Engineer Marc Campell – Mechanical Engineer Tim Montagne – Mechanical Engineer Rick Jackson – Design Engineer Don Arnett – Designer Ben Bigornia – Designer Joseph Stieber- Designer

  2. Outline • Distribution • Profile, Intensity, Intensity-Position Monitor • Slits • Pulse Picker • Attenuator

  3. Components Distribution • Components locations • Distributed throughout the XPP, CXI, and XCS instruments, including X-ray transport tunnel HEDS CXI Endstation X-ray Transport Tunnel XCS Endstation Near Experimental Hall XPP Endstation Far Experimental Hall LCLS X-ray FEL SXR AMO

  4. Components Distribution (cont.)

  5. Optical pixelated detector Optical zoom lens 45º mirror Scintillator Profile Monitor • Purpose: • Coarse beam alignment/monitoring; Coarse/fine beam profile • Specifications: • Destructive; Retractable • At 100 mm resolution - 24x24 mm2 field of view; • At 8 mm resolution - 2x2 mm2 field of view • Capable of per-pulse op. @ 120 Hz • Mechanical Requirements

  6. Profile Monitor • Challenges • Design continuity • Space Constraints • Commonality • Chamber • Stands • Stages • Solutions • Permanent staffing commitments • Combine IM/PM • Common mount for all monitor sensors • Concepts based on proven designs • Similarity to LCLS wire scanner

  7. Profile Monitor • Next Steps • Update Spec. Documentation -Nov 08 • PDR PM and Supports -Nov 08 • Finalize Design PM -Dec08 • Finalize Support Design -Dec08 • FDR PM & Supports -Feb 09 • Drawings -May 09

  8. Intensity Monitor • Purpose: • Coarse beam alignment/monitoring; Simple point detector • Specifications: • Destructive; Retractable • Relative accuracy < 1% • Dynamic range 100 • Capable of per-pulse op. @ 120 Hz • Mechanical Requirements

  9. Intensity Monitor • Challenges • Design continuity • Commonality • Chamber • Stands • Stages • Solutions • Permanent staffing commitments • Common mount for all monitor sensors • Concepts based on proven designs • Similarity to LCLS wire scanner

  10. Intensity Monitor • Next Steps • Update Spec. Documentation -Nov 08 • PDR IM and Supports -Nov 08 • Finalize Design IM -Dec 08 • Finalize Support Design -Dec08 • FDR IM & Supports -April 09 • Drawings -Aug 09

  11. Intensity-Position Monitor • Purpose: • Per-pulse normalization of experimental signals • High-resolution beam position monitoring • Specifications: • Highly transmissive (< 5% loss) • Relative accuracy < 0.1% • Dynamic range 1000 • Per-pulse op. at 120 Hz • Mechanical Requirements

  12. Intensity-Position Monitor • Challenges • Design continuity • Space Constraints • Commonality • Chamber • Stands • Stages • Solutions • Permanent staffing commitments • Common shaft mount for all monitor sensors • Concepts based on proven designs • Similarity to LCLS wire scanner

  13. Intensity-Position Monitor • Next Steps • Update Spec. Documentation -Nov 08 • PDR PM and Supports -Nov 08 • Finalize Design PM –Dec 08 • Finalize Support Design–Dec 08 • FDR PM & Supports - Jan 09 • Drawings -March 09

  14. Pink beam Low-Z High-Z Mono beam D=3 mm High-Z Slits • Purpose: • Defines the beam size & position • Clean up scatterings (halo) around beam perimeter • Specifications: • Can withstand full LCLS flux – unfocused • Minimize background scatter from blades • Mechanical Requirements

  15. Slits • Solutions • Available commercial products that would meet specifications with minor modifications. • Commercial product meets envelope requirements • Inspection reports have been requested from vendor on latest batch • Slit loaner has been requested from vendor for in-house evaluation • Inquired references from vendor and other labs about their experience with ADC’s slits. • Challenges • Precise Motion • Space Constraints • Vendor performance capabilities have been put into question

  16. Pink beam Low-Z High-Z Mono beam D=3 mm High-Z Slits • Next Steps • Update Spec. Documentation -Nov 08 • PDR -Nov 08 • Finalize Design –Dec 08 • FDR PM & Supports - Jan 09 • Inspect loaned unit –Feb 09 • Drawings -March 09

  17. Pulse Picker Design • Purposes • Select a single pulse or any sequence of pulses • Reduce LCLS repetition rate to < 10 Hz • Specifications • < 3 ms switching time • < 8 ms in close/open cycle time • Only for < 10 Hz operation • Withstand full LCLS flux • Implementation • Based on a commercial mechanical teeter-totter* • Steel blade fully stops beam • Si3N4 required to protect the steel blade • Capable of ms transient time Requires 100 mm • Mechanical Requirements Si3N4 coating on blade to reduce damage * http://www.azsol.ch/

  18. Pulse Picker • Solutions • Brazing schemes under study • Combined attenuator with Pulse picker device • Challenges • Blade Coating • Space Constraints • X < 300 mm • Minimize Z length

  19. Pulse Picker • Next Steps • Update Spec. Documentation -Nov 08 • PDR PP and Supports -Nov 08 • Finalize Design PP –Dec 08 • Finalize Support Design–Dec 08 • FDR PP & Supports - Jan 09 • Drawings -March 09

  20. Attenuator System • Attenuator Purpose • Reduce incident X-ray flux • Sample damage • Detector saturation • Diagnostic saturation • Alignment of optics and diagnostics • Attenuator Specifications • Minimize wavefront distortion and coherence degradation • Withstand unfocused flux • 108 attenuation at 8.3 keV • 105 attenuation at 24.9 keV • 3 steps per decade • Mechanical Requirements

  21. Attenuator System • Solutions • Use of actuators with stepper motors • Actuators meets envelope requirements • Reduce number of view ports • Combined attenuator with Pulse picker device • Challenges • Avoid pneumatic actuators • Space Constraints • X < 300 mm • Minimize Z length

  22. Attenuator System • Next Steps • Update Spec. Documentation -Nov 08 • PDR Attn. and Supports -Nov 08 • Finalize Design Attn –Dec 08 • Finalize Support Design–Dec 08 • FDR Attn & Supports - Jan 09 • Drawings -March 09

  23. Summary • Designs are progressing • Challenges have emerged • Vendor reputation • Space constraints in X and Z • Steps are being taken to overcome challenges

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