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Lu, Y.R.

Paper Title Page
THPCH015 Matched and Equipartitioned Method for High-intensity RFQ Accelerators 2814
 
  • X.Q. Yan, J.-E. Chen, J.X. Fang, Z.Y. Guo, Y.R. Lu
    PKU/IHIP, Beijing
  • R.A. Jameson
    LANL, Los Alamos, New Mexico
 
  Maintaining beam envelope match, avoiding structure resonances, and using an equilibrium (equipartitioned) energy balance within the beam are the primary methods for preventing emittance growth and halo formation in high current linacs. A design strategy that requires the RFQ accelerator to be matched and equipartitioned over most of its length will produces very robust designs under a wide variety of conditions, the beam with proper energy balance is also inherently stable against resonances near the operation point. Based on this strategy, a new dynamics method is proposed to avoid the envelope mismatch and energy imbalance between different degrees of freedom. The beam sizes are well confined to match the accelerating channel in this method, to minimize the emittance growth and the related beam loss. Following the method, a RFQ design code named MATCHDESIGN has been written at Peking University. A test design of 50mA proton RFQ operating at 350 MHz was given to prove this method and it resulted in a good dynamics design.