Speaker
Description
Conventional linacs operated at the zero synchronous phase offer high acceleration efficiency but usually lack intrinsic transverse focusing, requiring additional magnetic elements and increasing system complexity, size, power consumption, and cost. We propose a novel beam-dynamics concept, Simultaneous zerO-phase Focusing and Acceleration (SOFA), based on planar accelerating electrodes. Theoretical analysis indicates that the transverse focusing force is proportional to sin(phi0 + psi), where phi0 is the synchronous phase and psi is an effective focusing phase determined by electrode boundary conditions. Thus, even at phi0 = 0, a non-zero focusing force can be generated, enabling simultaneous acceleration and focusing. Using a multi-gap cumulative focusing strategy, preliminary 3D field-based simulations for a 12C4+ beam show stable periodic transverse envelope evolution and acceptable normalized transverse acceptance. Without embedded magnets, SOFA may improve accelerating gradient and shunt impedance while reducing RF power and cost, making it promising for cancer therapy and compact ion-beam applications.
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