2024/03/15 by Matthew Southerby, Southerby, Matthew, R. Apsimon +1
Engineering · Medicine · Physics and Astronomy · #Accelerator Physics (physics.acc-ph) #Advanced Radiotherapy Techniques #FOS: Physical sciences #Particle Accelerators and Free-Electron Lasers #Radiation Therapy and Dosimetry
paper · pdf · doi:10.48550/arxiv.2403.10212
openalex publication_date 2024/03/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper, a self-consistent transverse beam dynamics framework is demonstrated, that incorporates acceleration into the transverse beam dynamics studies for a proton linac machine. Two focusing schemes are developed and discussed; the FODO-like scheme, and the minimum aperture scheme. The FODO-like scheme is a simple scheme, requiring only one quadrupole per cavity. The scheme is analytically solved to minimise the beam size at the cavity entrance/exit and ensures a constant beam size along the lattice, with respect to adiabatic damping due to longitudinally accelerating rf cavities. The minimum aperture scheme describes the regime that matches the beam ellipse to the acceptance ellipse of a cavity, allowing for the smallest possible aperture, for a given cavity length. A simple approximation of an rf cavity map is determined to allow changes in particle energy along a lattice, and acceleration is assumed only in the longitudinal direction.