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FAC: XTOD Beam Transport

FAC: XTOD Beam Transport. X-ray Slit and Tunnel Design Pat Duffy, Kirby Fong, Keith Kishiyama, Steve Lewis, Stewart Shen, Pete Tirapelle, John Trent , Louann Tung April 20, 2006.

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FAC: XTOD Beam Transport

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  1. FAC: XTOD Beam Transport X-ray Slit and Tunnel Design Pat Duffy, Kirby Fong, Keith Kishiyama, Steve Lewis, Stewart Shen, Pete Tirapelle, John Trent, Louann Tung April 20, 2006 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. FEH FEE NEH Tunnel XVTS Overall Layout

  3. Front End Enclosure (FEE) Configuration Fast Valve Fixed Mask Diagnostics X-ray Slit Ion Chamber Attenuator Offset Mirrors

  4. X-ray Slit Key Requirements • Defines precision aperture of x-ray laser • Able to choose any rectangular area inside clear aperture of fixed mask (45 x 15 mm) • Attenuate spontaneous radiation energy 1000 times • Compatible with high vacuum environment • Opens to clear aperture for diagnostics • Resistant to damage by FEL

  5. X-ray Slits Concept Slit Block Fixed Mask Aperture

  6. Slit Block Concept Cutting Face Heavy Met • Single block larger than entire aperture of Fixed Mask • 70 mm thick block • 50 mm Heavy Met • Tungsten Alloy • Great attenuation • 20 mm Boron Carbide • Great damage resistance Radiation Boron Carbide

  7. X-ray Slit Concept Vertical Slit Horizontal Slit Linear Stage Stand Size (in): 28.62 long (Z) 54.45 wide 81.22 high

  8. Slit Block Support and Cooling Slit Block Water Cooling • Slit block can be water cooled or air cooled • Six DOF adjustment for each slit block: 3 struts, 3 push-pull screw pairs • Bellows isolate block assemblies from vacuum vessel • Design features borrowed from SSRL Bellows Strut

  9. X-ray Slits Features • Slits close to zero aperture, open beyond clear aperture of fixed mask • Slits allow extremely little radiation past that will stop in scintillator • Blocks align to beam direction manually • Negative rake on slit blocks (~3 mrad) • Set using alignment features external to vacuum • Blocks are offset in Z – they can’t touch • Compatible with UHV

  10. Slit Pair Remote Motions • Each slit block pair has adjustable degree of freedom • Aperture width – linear stage adjustment • Aperture center – linear stage adjustment • Linear motion specs based on IDC DS4 stage: • 50 or 100 mm travel, 1.3 m repeatability • 200 lb axial load capacity – 100 lb axial load

  11. Qin Qconv Qcond Qout Slit Block Assembly Thermal Model – Water Cooling • Heat in: internally generated 1 W input from spontaneous radiation • Conduct heat through block, interface, and end of Glidcop support rod • Heat out: remove by forced convection with water • Steady state model

  12. Thermal Model Results – Water Cooling • Slit block is 1.2 C hotter than cooling water • Rod in contact with water is 0.1 C hotter than cooling water • Total expansion is 0.6 micron due to heating from radiation • Slit block expands 0.5 micron • Support rod expands 0.1 micron

  13. Thermal Model Results – Air Cooling • Slit block is 6 C hotter than ambient • Rod in contact with air is 5 C hotter than ambient air • Total expansion is 4 micron due to heating from radiation • Slit block expands 1.4 micron • Support rod end expands 2.5 micron

  14. Stability • Stability is based on temperature variation • Room temperature effects stand • Incident power effects slit block assembly • PRD gives diurnal room temperature variation of +/- 1 C • 1.4 m tall steel stand moves 16.4 microns • Incident power adds 0.3 mm for water cooling or 2 mm for forced air cooling (plus/minus)

  15. Predicted Stability and Repeatability • Predicted Long-term • Stability: 17 mm (Water), 18.5 mm (Air) • Repeatability: 18 mm (Water), 19.5 mm (Air) • Predicted Short-term • Stability: 2 mm (Water), 3.6 mm (Air) • Repeatability: 3.3 mm (Water), 4.9 mm (Air) • Recommend forced air cooling for simplicity

  16. Vacuum Gate Valve Fast Valve Fixed Mask X-ray Slit • Ion pump under fixed mask – pumps Fast Valve, Fixed Mask, and X-ray Slit • Single pump is more efficient design • Good conductance • 2.7m long section • 4 in tube or larger Ion Pump

  17. Slit Block First Article • The is some risk is in the manufacture of the slit blocks themselves • Bonding of Boron Carbide to Heavy Met • Time to produce and yield • Step 1: Use bonding coupons to prove bonding process – coupons are on order • Step 2: Make slit block pair this FY to lessen risk and shorten production time • First article to be used in final assembly

  18. Attenuation Simulation – It will work! • With slit closed, nothing stops in scintillator plate – full distribution • In fully closed slit simulation – 100,000,000 high energy (1.2 MeV+) photons to slit, 17,260 after slit, zero stopped in scintillator of DI After Slit at Direct Imager After Fixed Mask

  19. X-ray Slit Schedule Summary • System Concept Review 1 – 3/1/06 • System Concept Review 2 – April ‘06 • Preliminary Design Review – July ‘06 • Final Design Review – September ‘06 • X-ray Slit Available at SLAC – June ‘07

  20. X-ray Tunnel

  21. Key Tunnel Design Requirements • Provides environment to transport x-ray laser • Average vacuum < 1 E-5 Torr • Does not obstruct FEL • Ion pumps to last 10 years • Meets SLAC Seismic Design Standard • Aligns to laser beam-line • Vertical and lateral adjustments, at a minimum

  22. Pump Stand with Gate Valve Bellows Beam Tube, 4” OD, 10.5 foot sections Bellows Tube Support Stand Pump Stand w/ Ion Pump Typical Section of Tunnel Beamline

  23. Pump Stand • Stand is designed to support ion or turbo pump, a gate valve, and load from beam-line tubing • Top of stand will include features for 5 DOF adjustment (no beamline) • Defined lift points – Four threaded holes for swivel lifting eyes • Aligned using clamp-on fixture Pump Cross Ion Pump Stand

  24. Tube Support Stand • Constrains vertical and lateral motion • 5 DOF adjustment (no beamline) • Clamps to tube - beamline adjustment is not required • Aligned using clamp-on fixture Beamline Clamp Adjustments

  25. Stress from 2” wide Tube Clamp is Acceptable Maximum stress: 11200 psi 3600 lb. load from 2 in. clamp using ¼” bolts Vacuum contributes 350 psi stress (included)

  26. Structural Engineering Inputs • Pump spacing • Yields stand spacing of approx. 60 ft. • Sections isolated by bellows • Component weights • Ion pumps, tubing, gate valves, etc. • Accelerations due to seismic loading • From SLAC Seismic Design Specification • 1.6g’s horizontal,1.35 g’s vertical - 2% damping, 17 Hz • Horizontal acceleration applied in worst case direction – beamline for pump stand, lateral for tube support

  27. Maximum stress: 18% of allowable stress in 3/4” threaded supports Per AISC LRFD Maximum deflections: 0.000” Beamline 0.010” Lateral 0.000” Vertical Formed bellows allow 0.25” lateral offset Load applied in lateral and vertical directions First mode 31 Hz Output of Seismic FEA – Pump Stand

  28. Output of Seismic FEA – Tube Support Maximum stresses: 13% of allowable stress in Tube Supports Per AISC LRFD First mode 16 Hz Maximum deflections: 0.000” Beamline 0.045” Lateral 0.012” Vertical Load applied in lateral and vertical directions

  29. Z , meters 50 100 150 200 Pressure Profile with 6-75 L/s Ion Pumps at 100 hrs 1.2 Peaks well within design at 3 x 10-6 1.0 Pressure, 10-6 Torr 0.8 9 yr life at this pump pressure 0.6 Life should exceed 9 yrs here 0.4 For SnomimalTotal = 450 L/s, SnetTotal = 327 L/s Theory: P=Q/S = 4.1 x10-7 Torr. The best that can be achieved. Code: Pavg = 8.4 x10-7 Torr. So our design is efficient!

  30. Z 50 100 150 200 Pressure, 10-6 Torr 2 1 0.5 0.2 seconds 0 10 100 200 300 Pressure profile and time response with 4th pump failed Pressure, 10-6 Torr 3 Pmax = 3.4 x 10-6 Torr Pmin = 3.4 x 10-7 Torr 2 Even with one failed pump, peak pressure is below 6x10-6 and pump pressures are safely in the -7 range 1 P(4th pump) goes from 3.4 x 10-7 to 3.4 x 10-6 Torr within 2 minutes 2 min

  31. . 100 1000 10000 100000 Vacuum model provides 100 hr historyof pressure at any location 100 Scroll Pressure, Torr 1 10-2 Turbo 10-4 Ion 10-6 10-8 Time, sec 1 31 100 hrs

  32. Normal pumpdowns will be much faster than 100 hrs 600 DS would rough in 30 min vs. 60 min for the 300DS t = Volume/Speed 100 Scroll Pressure, Torr 1 Most optimistic rate of constant 10-10 Torr-lit/sec/cm2 is assumed 10-2 Turbo 10-4 Ion 10-6 100 1000 10000 seconds 1 1.5 hrs

  33. Gauge Controller Ion Pump Controller Magnetic Starter LCLS XTOD Vacuum System Controls Block Diagram OPI OPI PC/Linux PC/Linux Ethernet EtherNet/IP RSLogix software PC/Windows 1756 ENET Ethernet Interface Serial interface ControlLogix Flex I/O IOC 1794 AENT Tunnel Gate Valve I/O Gate Valves Vacuum set points and alarms Scroll pump control Scroll Pump RS-232 Pirani , CCG RS-232 Ion Pump Vacuum Interlocks

  34. X-ray Tunnel Schedule Summary • Preliminary Design Review – Complete • Seismic Safety Document – In Review • Final Design Review – May ‘06 • Equipment Available at SLAC – July ‘07

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