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FFAG Studies at BNL

FFAG Studies at BNL. Alessandro G. Ruggiero Brookhaven National Laboratory FFAG’06 - KURRI, Osaka, Japan - November 6-10, 2006. FFAG Studies at Brookhaven. South Corner: Muons Palmer, Berg, … North Corner: Protons Ruggiero, Trbojevic Dejan -> Medical, Gantry, eRHIC,…

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FFAG Studies at BNL

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  1. FFAG Studies at BNL Alessandro G. Ruggiero Brookhaven National Laboratory FFAG’06 - KURRI, Osaka, Japan - November 6-10, 2006

  2. FFAG Studies at Brookhaven • South Corner: Muons Palmer, Berg, … • North Corner: Protons Ruggiero, Trbojevic Dejan -> Medical, Gantry, eRHIC,… Sandro -> AGS-FFAG, Neutrino Factory, MA-LE-PD, (RIA, electrons,…) A.G. Ruggiero (BNL) -- FFAG'06

  3. AGS-FFAG New AGS Injector for Upgrade to 1-4 MW at 28 GeV Rep Rate 2.5 - 5.0 Hz Protons 1014 ppp Circumference 809 m FFAG FDF Triplet Non-Scaling Lattice Linear Field Profile FFAG Reference Design Linac FFAG AGS After-Burner 400 MeV 1.5 GeV 20 GeV 40 GeV All in the same AGS Tunnel A.G. Ruggiero (BNL) -- FFAG'06

  4. NuFact - Requirements Kinetic Energy 5 - 15 GeV 11.6 GeV Average Power 4 MW 4 MW Repetition Rate 50 Hz 50 Hz Number of Bunches 3 - 5 5 Bunch Length (rms) 1 - 3 ns 2 ns Number of Protons 4.31 x 1013 per pulse Protons per Bunch 0.862 x 1013 A.G. Ruggiero (BNL) -- FFAG'06

  5. Accelerator Architectures Rapid-Cycling Synchrotrons Super-Conducting Linacs FFAG (cyclotrons, RLA, microtrons, …) SCL CEBAF Dog-Bone FFAG The case for a Non-Scaling FFAG A.G. Ruggiero, BNL Report C-A/AP/219, Oct. 2005 also in proceedings of NuFact’06, Frascati, June 2005 A.G. Ruggiero (BNL) -- FFAG'06

  6. 3 FFAG Rings 0.4 - 1.5 GeV 1.5 - 4.45 GeV 4.45 - 11.6 GeV Single-turn Transfer 400-MeV Injector Multi-turn Injection Single-turn Extraction FFAG Accelerators for Proton Driver The scheme allows flexibility of choice of energy, intensity, rep rate. It can suit any requirements for muon production and collection FFAG’s are Non-Scaling of about the same circumference and similar structure, located in the same enclosure. Bunch Compression is done in the last ring at the end of acceleration. A.G. Ruggiero (BNL) -- FFAG'06

  7. Three - FFAG Accelerator Rings (1) * A.G. Ruggiero, “1.5-GeV FFAG Proton Accelerator for the AGS Upgrade”, Invited Talk to EPAC-04, July 6-11, 2004, Lucerne, Switzerland. Ta = 10 ms A.G. Ruggiero (BNL) -- FFAG'06

  8. D F F S S g g Lattice Parameters Non-Scaling Lattice A.G. Ruggiero (BNL) -- FFAG'06

  9. Linear Field Distribution (kG vs. cm) Injector Ring High-Energy Ring Low-Energy Ring A.G. Ruggiero (BNL) -- FFAG'06

  10. Lattice Functions All Rings Linear Field Profile Injection Extraction A.G. Ruggiero (BNL) -- FFAG'06

  11. F D F Tune Variation & RadialCompactnesssame result for all Rings Half a Period  = (p - pinj) / pinj A.G. Ruggiero (BNL) -- FFAG'06

  12. Three - FFAG Accelerator Rings (2) A.G. Ruggiero (BNL) -- FFAG'06

  13. Three - FFAG Accelerator Rings (3) Injection Injection A.G. Ruggiero (BNL) -- FFAG'06

  14. RF Frequency & Power MHz MW Injector Ring Low-Energy Ring High-Energy Ring # turns # turns MHz MW # turns # turns 250 kW/cavity MW MHz # turns # turns A.G. Ruggiero (BNL) -- FFAG'06

  15. B1 Injection Orbit B2 Bump Orbit C1 Foil C2 From DTL Injector Ring and Injection RF Ion Source ? A.G. Ruggiero (BNL) -- FFAG'06

  16. Kicker Septum F D F F D F F D F Extraction and Targetting The Revolution Period at Extraction from the High-Energy Ring T0 = 2.70 µs Beam Bunches are extracted individually every n turns Pulse Duration n = 1 n T0 = 2.70 µs 10.80 µs 2 5.40 21.60 3 8.10 32.40 4 10.80 43.20 5 13.50 54.00 A.G. Ruggiero (BNL) -- FFAG'06

  17. NuFact - Conclusions • FFAG Accelerators for Neutrino Factories are feasible • Issues: Space Charge at Injection Multiple Resonance Crossing Injector Linac (400-MeV DTL or ????) Multi-turn Injection of H– Magnet Feasibility Fast RF sweep (ferrite, RF power) Collimation Numerical Tracking Cost Estimate • It is possible to raise the Repetition Rate --> 1 kHz or CW Mode of Operation (Harmonic Number Jump) A.G. Ruggiero (BNL) -- FFAG'06

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