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Opportunities for Future Accelerators FFAG Model

Opportunities for Future Accelerators FFAG Model. Hywel Owen ASTeC Daresbury Laboratory. 4GLS – The Next Light Source for the UK. Daresbury Laboratory - Tower Building. ERLP – A Testbed for 4 th Generation Light Sources. FFAG Prototype - Location. FFAG Prototype - Location.

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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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