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Opportunities for Future Accelerators FFAG Model

The FFAG (Fixed Field Alternating Gradient) model at Daresbury Laboratory presents revolutionary advancements for the UK's next generation of light sources. This facility will serve as a testbed for 4GLS technology, facilitating research in beam dynamics, energy recovery, and compression mechanisms. With state-of-the-art alignment and shielding systems, Daresbury offers low differential movement and robust metrology for precise measurements. The collaboration seeks to enhance particle accelerator technology and contribute significantly to innovation in the field.

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Opportunities for Future Accelerators FFAG Model

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  1. Opportunities for Future Accelerators FFAG Model Hywel Owen ASTeC Daresbury Laboratory

  2. 4GLS – The Next Light Source for the UK

  3. Daresbury Laboratory - Tower Building

  4. ERLP – A Testbed for 4th Generation Light Sources

  5. FFAG Prototype - Location

  6. FFAG Prototype - Location 30deg extraction FFAG Ring

  7. FFAG Prototype - Location 0deg extraction FFAG Ring

  8. Arc Dipole Magnet with Chamber Arc Dipole Magnet Survey Target Holders 30 deg. extraction port EBPMs 0 deg. extraction port

  9. Example Transfer Line: Transfer Line 2/Module 1 Quadrupole Magnet OTR Dipole Magnet Beam Height 1.4 from floor Lifting Points Girder Support Pedestal Corrector Coil/ EBPM Assembly Ion Pump

  10. Electron BPMs Stripline (Straight Sections) Button (Arc Dipole Vessels) Typical accuracy ~10um Limited by alignment

  11. 85/70/50/Rect. Modular OTR/YAG Profile Monitor Centroid position ~1mm Profile resolution ~100um

  12. Output Energy 8.35 – 35 MeV Perhaps higher (70 MeV with 2 passes?) Lower limit set by bunch train length via injection bend angle Norm. emittance ~4-7 mm-mrad Depends on cathode/gun Increased space charge at low energies (~b2g3) 10-160 pC/bunch (varies) 1 - 8000 bunches Bunch rep. rate 81.25 MHz Train rep. rate 1-20 Hz Energy spread ~1% ~1/E Bunch length ~4 ps without compression Shorter bunch lengths may be possible with negative compression Base RF 1.3GHz Timing measurement from Gun/EO laser <200fs Limited by RF and vibration Total beam power limited by radiation (3W) ERLP and FFAG: Key Parameters

  13. -56 -28 0 0 +28 +28 +28 +ve +ve p p Compression and Energy Recovery FEL FEL

  14. S2E Simulation 4 1 3 2 First case of complete S2E modelling of an ERL with a FEL and energy recovery

  15. Compressors and Sign Conventions LD LB Relativity – ‘drift R56’ (small at 35MeV)

  16. Arcs Have Negative R56 -

  17. -28 +28 Positive and Negative Compression -ve +ve

  18. Compression Summary • Compression to less than 4ps may be possible at FFAG • Perhaps as low as 300fs • Needs designing!

  19. Site Stability • Concrete cast in 1973 • Well settled! • Very low differential movement • Very large mass of concrete on a stable foundation • As good as anywhere • 4GLS location ERLP Foundation Level Basement Level

  20. ERLP Alignment - Survey Tools Faro Laser Tracker Repeatability 1m +1 m /m Accuracy 10 m + 0.8 m /m Uncertainty ≈ 10 m /m Portable Robust Spatial Analyzer Metrology Software Error Simulations Multiple instruments/types Automation

  21. ERLP Alignment - 1st Grid Simulation 1st Simulation of proposed reference grid in SA 76 Grid reference points 40 Instrument positions Each point measured by a minimum of 3 instruments Faro Tracker Grid reference points

  22. ERLP Survey - Simulation Results Most points can be surveyed to within +/- 50 m Worst point within +/- 82 m Instruments reference multiple points, worst Instrument position +/-13 m

  23. ERLP Construction - Internal Shielding Installation

  24. ERLP Construction - External Shielding Installation

  25. ERLP Construction - Control Room Control System built on EPICs

  26. ERLP Construction - Control Room

  27. Daresbury Capabilities - Assembly Building

  28. Daresbury Capabilities - Magnet Measurement Facility

  29. Daresbury Capabilities - Class 100 (ISO 5) Clean Room

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