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Undulator Systems Stephen V. Milton, ANL May 21, 2003

Undulator Systems Stephen V. Milton, ANL May 21, 2003. Hi Steve! A checklist of items to be covered . System Overview Undulator Prototype data recap If Liz is coming, do you want her to do this? We could make it after lunch thursday List of long-lead procurements

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Undulator Systems Stephen V. Milton, ANL May 21, 2003

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  1. Undulator SystemsStephen V. Milton, ANLMay 21, 2003 Stephen V. Milton, ANL

  2. Hi Steve! A checklist of items to be covered • System Overview • Undulator Prototype data recap • If Liz is coming, do you want her to do this? We could make it after lunch thursday • List of long-lead procurements • Technical Specifications for each • Cost Estimate for each (show contingency explicitly) • Design (not exactly applicable to your LLPs) • Procurement • Schedule for each • Design (show milestones for design complete) • Procurement (show RFQ date, interval for bid, selection milestone, construction/delivery) • Manpower required for each • Design • Procurement • Place in context of schedule for production prototype undulator • Place in context of LCLS overall schedule • Comments on risk assessment • Show R&D Budget and Plans for FY2004-2005 • Slides for your back pocket • Comparison of present cost estimate to last year’s estimate, item by item • PED plans for FY2003-2006 • All of the slides from the last review Stephen V. Milton, ANL

  3. Undulator Systems WBS 1.2.3 Undulator Systems WBS 1.2.3 Stephen V. Milton, ANL

  4. List of the Undulator Line Systems • Undulator magnetic structure • periodic magnetic structure • end’s termination • strongback • Mechanical support - movers • Quadrupole Lens • Coils - correctors • E-beam position monitors • X-ray diagnostics • Undulator vacuum chamber and diagnostics station • Controls and data acquisition • Support laboratory - magnet measurement facility Stephen V. Milton, ANL

  5. Cell structure of the LCLS undulator line 421 187 3420 UNDULATOR 11055 mm Horizontal Steering Coil Vertical Steering Coil Beam Position Monitor X-Ray Diagnostics Quadrupoles Stephen V. Milton, ANL

  6. Saturation length (m) vs. undulator period and average ß-function Stephen V. Milton, ANL

  7. 16 perfect imperfect Z 0 100 Fast code RON-tool for developing of specifications The saturation length increase ∆LS due to imperfections. Stephen V. Milton, ANL

  8. L E U T L : T r a j e c t o r y f r o m 5 Distance along FEL (m) Undulator’s Performance and Computer Modeling of SASE • N e w c o m p u t e r c o d e h a s b e e n d e v e l o p e d a t t h e A P S t o a i d i n t h e d e s i g n o p t i m i z a t i o n o f h i g h - g a i n , s h o r t - w a v e l e n g t h f r e e - e l e c t r o n l a s • Undulator’s performance is close to theoretically achievable. • Computer codes calculate SASE signal growth and take into account all imperfections of the undulator line. • T h e c o d e c a l c u l a t e s t h e s i g n a l g r o w t h o f t h e b e a m c u r r e n t d e n s i t y v s . d i s t a n c e a l o n g t h e u n d u l a t o r . • T h e c o d e t a k e s i n t o a c c o u n t n o n - i d e a l m a g n e t i c s y s t e m s , s u c h a s s e g m e n t e d u n d u l a t o r s w i t h d i s t r i b u t e d f o c u s i n g , r e a l m e a s u r e d m a g n e t i c f i e l d f i l e s , a n d m i s a l i g n e d u n d u l a t o r s . LEUTL: SASE power vs. distance (5 undulators) LEUTL: Trajectory from 5 measured undulators L E U T L : S A S E p o w e r v s . d i s t a n c e ( 5 u n d u l a t o r s ) m e a s u r e d u n d u l a t o r s Power (arbitrary units) Horizontal trajectoy (µm) Ideal undulators Measured undulators I d e a l u n d u l a t o r s M e a s u r e d u n d u l a t o r s Distance along FEL (m) Distance along FEL (m) Distance along FEL (m) NIM, A445, pp.19-23 (2000) Stephen V. Milton, ANL

  9. A0is a measured value for the reference ID. A represents all other ID’s These tolerances correspond to approximately 3% growth of the gain length. Tolerances for the LCLS undulator section (undulator + quadrupole) Phase slippage over the length of one section Stephen V. Milton, ANL

  10. Definition of the Parameter A Intensity of Zero-angle spontaneous radiation at frequency ck is , where Stephen V. Milton, ANL

  11. B0 Uniformity Quantative approach: for 23 IDs leads to Stephen V. Milton, ANL

  12. Prototype Module Stephen V. Milton, ANL

  13. Total Magnetic Moment (T) Magnets in order of increasing magnetic moment Magnet Block Strength Stephen V. Milton, ANL

  14. After pairing the magnets by matching strong to weak, to even out the distribution. Magnet Strength after Pairing Stephen V. Milton, ANL

  15. Magnetic Measurement of the Prototype Horizontal Trajectory Microns Stephen V. Milton, ANL

  16. Phase Advance N- number of poles For one undulator section z1 z z2 z3 Phasing of the Undulator Sections End’s section Stephen V. Milton, ANL

  17. when It translates in the gap g increase: Where is the ratio of the coherent and spontaneous radiation power. Tapering Stephen V. Milton, ANL

  18. Test of Undulator Movers Stephen V. Milton, ANL

  19. Quadropole Lens Prototype Field gradient G = 75T/m Magnetic length lm = 5.6cm Focal length F = 11.3m Stephen V. Milton, ANL

  20. Vacuum System • Two different sections: • Pipe in the undulator • Diagnostics vacuum chamber • General requirement : ≈10-7torr • Influence of the pipe’s wall roughness • Discontinuity of the vacuum surface • Transitions and liners Stephen V. Milton, ANL

  21. Conceptual Design for Combined Button / Cavity BPM Button BPM 1µ or better single shot resolution 1-2µ stability over periods of hours 50µ absolute accuracy Cavity BPM 5µ absolute accuracy submicron stability Stephen V. Milton, ANL

  22. CCD CCD l = 2.9 Å PIN diode Undulator cell l = 1.5 Å Diamond crystal X-Ray Diagnostics Setup X-ray diagnostics will be located in the last break of each undulator cell, it includes: - x-ray diamond crystal monochromator - PIN diode detectors and attenuation filters for absolute flux measurements - CCD detectors for spatial measurements Stephen V. Milton, ANL

  23. X-Ray Diagnostics - Summary • X-ray diagnostics will provide direct measurements of absolute spectral flux and spatial properties of spontaneous and SASE radiation along the undulator line It will meet the following requirements: • one-shot sensitivity for all types of spectral, flux, and spatial measurements • many orders of magnitude dynamic range • accuracy of the absolute flux measurement better than 10% • few microradian sensitivity for trajectory straightness Stephen V. Milton, ANL

  24. 1.2.3 Undulator Cost Estimate (FY02 Dollars, Thousands) Stephen V. Milton, ANL

  25. 1.2.3.1 Undulator PED Cost Estimate (FY02 Dollars, Thousands) Stephen V. Milton, ANL

  26. Undulator System Schedule Stephen V. Milton, ANL

  27. PED Milestones Milestone Date Design of 2nd undulator prototype 1/1/03 Diagnostics specifications completed 4/1/03 Preliminary design of diagnostics completed 7/1/03 Preliminary design of vacuum chamber 8/1/03 Assembly of 2nd prototype undulator complete 9/2/03 Final design of undulator complete 12/2/03 Prototype vacuum chamber assembled 2/1/04 Bid package for undulator complete 4/1/04 Final design of vacuum chamber complete 8/1/04 Diagnostics, vacuum chamber, electromagnet bid package complete 10/1/04 Stephen V. Milton, ANL

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