Speaker
Description
Beam coupling impedance is a fundamental performance limitation in high-intensity hadron rings, affecting both beam stability and the thermal load on accelerator components. As beam intensity increases, impedance-driven collective effects—such as transverse mode coupling and longitudinal coupled-bunch instabilities—become more pronounced, while beam-induced power losses can cause local overheating and potential hardware damage. Accurately evaluating these effects remains a major challenge due to the complex geometries of the accelerator devices, the correct modelling of electromagnetic material properties, and the ranges of frequencies that need to be covered. Accurate impedance modelling is essential for predicting instability thresholds and quantifying power deposition in both of current and future hadron accelerators, such as the LHC and FCC-hh. In this contribution we will show how the development of modern open-source Wakefield solvers like Wakis allow addressing the current computational challenges in beam-coupling impedance modelling. Moreover, examples will be discussed, in which the design of existing devices is modified to optimise their impedances.
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