Speaker
Description
The RF-Focused Interdigital linac (RFI) integrates the high shunt impedance of an IH-DTL with strong RF quadrupole focusing for compact low-energy ion acceleration. Current design codes, limited by idealized hard-edge approximations, neglecting soft-edge fringe fields and time-dependent focusing effects, which leads to beam envelope mismatch. To address these limitations, we present a novel dynamics design framework featuring an automated closed-loop interface between beam dynamics algorithms and CST 3D electromagnetic simulations. Longitudinally, it utilizes slice-based transit-time factor integration and dynamic phase-locking to adaptively optimize drift tubes geometry using real field data. Transversely, an iterative co-simulation scheme is introduced to determine the effective RF focusing parameters by coupling CST three-dimensional field with TraceWin particle tracking under an optimization loop. This framework enables accurate mapping from ideal lattices to 3D RF cavities, providing a novel and precise design methodology for magnet-free compact linacs.
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