Design of a large energy acceptance beamline using fixed field accelerator optics
Physical Review Accelerators and Beams American Physical Society (APS) 27:7 (2024) 071601
Corrigendum to “Comparative Analysis of Radiotherapy Linear Accelerator Downtime and Failure Modes in the UK, Nigeria and Botswana” [Clinical Oncology 32 (2020) e111–e118]
Clinical Oncology Elsevier 35:5 (2023) e347
Creating exact multipolar fields with azimuthally modulated rf cavities
Physical Review Accelerators and Beams American Physical Society (APS) 25:6 (2022) 062001
A study of coherent and incoherent resonances in high intensity beams using a linear Paul trap
New Journal of Physics IOP Publishing 21 (2019)
Abstract:
In this paper we present a quantitative measurement of the change in frequency (tune) with intensity of four transverse resonances in a high intensity Gaussian beam. Due to the non-linear space charge forces present in high intensity beams, particle motion cannot be analytically described. Instead we use the Simulator of Particle Orbit Dynamics (S-POD) and the Intense Beam Experiment (IBEX), two linear Paul traps, to experimentally replicate the system. In high intensity beams a coherent resonant response to both space charge and external field driven perturbations is possible, these coherent resonances are excited at a tune that differs by a factor $C_{m}$ from that of the incoherent resonance. By increasing the number of ions stored in the linear Paul trap and studying the location of four different resonances we extract provisional values describing the change in tune of the resonance with intensity. These values are then compared to the $C_{m}$ factors for coherent resonances. We find that the $C_{m}$ factors do not accurately predict the location of resonances in high intensity Gaussian beams. Further insight into the experiment is gained through simulation using Warp, a particle-in-cell code.Developing innovative, robust and affordable medical linear accelerators for challenging environments
Clinical Oncology Elsevier 31:6 (2019) 352-355