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Front End Enclosure (FEE) Components Fast Valve, Fixed Mask, X-ray Slit, and Solid Attenuator

This update covers the design specifications and concepts for the fast valve, fixed mask, x-ray slit, and solid attenuator components of the Front End Enclosure (FEE). It includes detailed information on the key requirements, specifications, movement specifications, and concepts for each component. The work was performed under the U.S. Department of Energy by the University of California, Lawrence Livermore National Laboratory.

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Front End Enclosure (FEE) Components Fast Valve, Fixed Mask, X-ray Slit, and Solid Attenuator

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  1. LCLS XTOD FEE Design Update Fast Valve, Fixed Mask, X-ray Slit, and Solid Attenuator John Trent October 26, 2005 This work was performed under the auspices of the U.S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48.

  2. Front End Enclosure (FEE) Configuration Fast Valve Fixed Mask and X-ray Slit Solid Attenuator Ion Chamber Gas Attenuator

  3. Fast and Slow Valve Specifications • Fast Valve • VAT Series 77 Flap Shutter with Pneumatic Actuator • Closes to less than 30 mTorr*L/s within 15 ms • Opens to full size of beam pipe • 2,000 cycles to first service • Slow Valve • VAT Series 48 All Metal Gate Valve • Seals within 3 seconds • 20,000 cycles to first service • Controls • VAT VF-2 Controller • VAT High Vacuum Sensor • EPICS Compatible • Meets or exceeds all requirements

  4. Fixed Mask Key Requirements • Define clear aperture for diagnostics as a 5 x 10 cm image at NEH (757.404 m) • Protect downstream equipment from non-central radiation • Align aperture within 1 mm of beam position

  5. Fixed Mask Concept Tantalum Mask – 5 cm thick 6 Strut System 0.03mm Resolution 5 DOF Mount

  6. X-ray Slit Key Requirements • Defines precision aperture of x-ray laser • Able to choose any rectangular area inside clear aperture of fixed mask – 0.16 mm or larger • 10 micron linear resolution • Blocks aligns to beam axis within 29.5 arc-seconds • Compatible with high vacuum environment • Opens to clear aperture for diagnostics • Compatible with EPICS control system

  7. X-ray Slit General Specifications • Two pairs of slits • One horizontal • One vertical • Stages compatible with 1E-6 Torr • Slits open beyond clear aperture • 6 strut system can yield 0.03 mm resolution

  8. X-ray Slit Movement Specifications • Radial motion • 360 degree travel • 3 arc-sec resolution • 30 arc-sec accuracy • 6 arc-sec repeatability Horizontal Slit Block - B4C • Linear motion • 100 mm travel • 1.25 m resolution • 2 m accuracy • 2 m repeatability Limit Switch (2) Manual Rotary Stage Limit Switch Adjuster (2) Motorized Linear Stage Motorized Rotary Stage

  9. Solid Attenuator Concept • 256 attenuation levels • Eight beryllium slides • Each twice as thick as the last (0.3 to 38.4 mm) • Up to 99.998% attenuation of 8.26 keV x-rays • Millions of attenuation levels when used with gas attenuator • Pneumatically actuated

  10. Sample of Predicted Transmission Levels

  11. Conclusion • FEE components ready for Conceptual Design Review: • Fast Valve • Fixed Mask • X-ray Slit • Solid Attenuator

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