Simulations and measurements of coupling impedance for modern particle accelerator devices

In this document it has been treated the study of the coupling impedance in modern devices, already installed or not, in different particle accelerators. In the specific case: • For a device in-phase of project, several simulations for impedance calculation have been done. • For a component already realized and used, measurements of coupling impedance value have been done. Simulations are used to determine the impact of the interconnect between to magnets, designed for the future particle accelerator FCC, on the overall impedance of the machine which is about 100 km long. In particular has been done a check between theory, simulations and measurements of components already built, allowing a better and deeper study of the component we have analysed. Controls that probably will be helpful to have a clear guideline in future works. The measurements instead concern in an existing component that was already used in LHC, the longest particle accelerator ever realised on the planet, 27 km long. The coupling impedance measurements, in that case, have been carried out to determine the real influence that the beam particle has on the material around it self. Material that may have changed some of its main properties after many hours of work. The study drove by Diego Ferrazza with the help of the entire research team BE-ABP-HSC and especially thanks to the constant presence of my two supervisors: Benoit Salvant and Nicolò Biancacci. Without forgetting the remote supervision of my thesis advisor: Prof. Andrea Mostacci.