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Muon Accelerator Front-End

Muon Accelerator Front-End. Diktys Stratakis Brookhaven National Laboratory. Contributions from: J.S. Berg, X. Ding, H. Kirk, K. McDonald, D. Neuffer, H. Sayed, and P. Snopok. MAP Collaboration Meeting May 31, 2014 Fermi National Laboratory, Batavia IL, USA.

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Muon Accelerator Front-End

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  1. Muon Accelerator Front-End Diktys Stratakis Brookhaven National Laboratory Contributions from: J.S. Berg, X. Ding, H. Kirk, K. McDonald, D. Neuffer, H. Sayed, and P. Snopok MAP Collaboration Meeting May 31, 2014 Fermi National Laboratory, Batavia IL, USA

  2. Front-End (FE) Baseline channel • Major components include: • Target & capture • Chicane • Decay channel • Buncher • Phase-Rotator FE Phase-space manipulation

  3. Major Accomplishments Delivered a conceptual design of a carbon target, capture solenoid and proton dump. They are optimized for 1 MW, 6.75 GeV proton beam. Delivered a short-taper (~5 m) magnet design to capture the produced muon beam. Previous discrepancies in modeling the chicane/ absorber system are now understood. Chicane is now optimized and integrated into the FE Reduced substantially the number of Buncher & Phase Rotator rf frequencies.

  4. Target & Capture design

  5. Target & Capture system • Proton Driver: • 6.75 GeV (kinetic energy) proton beam with 3 ns pulse • 1 MW initial beam power • NF: 60 Hz rep rate, MC: 15 Hz rep rate • Target Concept: • Graphite target • Inside 20 T magnet • Target and proton beam are tilted with magnetic axis • Proton beam dump via graphite rod just downstream of the target • The 20 T field on target should drop to the ~ 2 T field in the rest of the Front End over ~ 5 m.

  6. Chicane Optimization • Have a solution for chicane parameters for a given proton kinetic energy cutoff • Energy deposition studies will determine the safe cut off proton energy.

  7. Buncher & Rotator parameters • Re-designed to match to a 325 MHz cooler • Buncher (21 m long) • 490 to 365.0 MHz (56 freq.) • RF voltage: 0.3 to 15.0 MV/m • 2.0 T magnetic field • Rotator (24 m long) • 364.0 to 326.0 MV/m (64 freq.) • RF voltage: 20 MV/m • 2.0 T magnetic field Baseline has 120 different frequencies!

  8. Discretization of frequencies • Our goal is to reduce the number of frequencies. • Going from 120 to 30 frequencies -> 8% loss

  9. Remaining tasks FY 2014 Conceptual specification report write-up for target/solenoid/ proton dump (June 14). Conceptual design report write-up for chicane, buncher & phase-rotator (October 14) . Finish-up chicane optimization work (retune buncher-phase-rotator). Document this work. Produce input beam distributions for the new Carbon target configuration (1 MW, 6.75 GeV) First pass beam dynamics study for the FE with the new distributions

  10. Future Activities • Re-optimize FE with the new target parameters • Detailed energy deposition study • Target & Chicane • Remaining Front-End components • Further feasibility studies • Realistic coils in buncher & phase-rotator • Cavity windows • Number of frequencies needed • Integrate FE with 6D cooler

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