Simulation of slow extraction from cotangential trajectory accelerator

A new conceptual accelerator was proposed. This accelerator is to be suitable for particle beam therapy system because of potential to be compact. The characteristics of this accelerator are cotangential trajectory alignment, beam stability by weak focusing field and frequency modulated RF acceleration. A slow extraction by transverse RF kick under second order resonance (2ν_r = 2) will be adopted. The purpose of this research is to confirm feasibility of the beam acceleration by frequency modulated RF and slow extraction by numerical simulation. As results, the acceleration by frequency modulated RF and generation of RF bucket, and the large turn separation by peeler and regenerator deployed outside of trajectory of maximum energy beam. (author)