Speaker
Description
Current studies at ISIS aim to improve the measurement, modelling, and control of ring beam dynamics, with the broader goal of optimising operational setup and benchmarking beam-loss predictions for ISIS and the proposed megawatt-class upgrade, ISIS-II. Beam loss in high-intensity synchrotrons can arise from the combined effects of non-linear resonances, machine non-linearities, and space charge.
This contribution presents recent machine-physics studies carried out on ISIS to investigate the impact of non-linear resonances on beam dynamics and beam loss. The work focuses on understanding how lattice non-linearities and resonance excitation influence beam behaviour, and how these effects are modified in the presence of space charge. A key objective of this work is to develop and validate an accurate non-linear model of the ISIS synchrotron. Experimental observations from beam profile and beam loss monitors are compared with particle-tracking simulations, thereby benchmarking the model against measured beam response under controlled non-linear conditions. The results provide insight into the interplay between lattice nonlinearities, resonance excitation, and space-charge effects and contribute to improved predictive capability for beam-loss studies in ISIS and future high-intensity synchrotron upgrades.