A comprehensive analysis of an eddy current septum magnet used for top-up beam injection in the upcoming SOLEIL II particle accelerator upgrade

Particle accelerators are used to conduct scientific experiments in numerous fields like fundamental physics or medicine, amongst others. Charged particles are accelerated to high energies employing multiple accelerator stages. This necessitates the extraction and injection of the particle beam to navigate the particles between the different stages. Both injection and extraction require numerous systems to ensure that the particle beam follows the desired trajectory, and one of these systems is the septum magnet. A collaboration between CERN (European Organisation for Nuclear Research) and SOLEIL (Source op- timisée de lumière d'énergie intermédiaire du LURE) has been established to analyse a fast pulsed, thin eddy-current septum magnet that was designed for the Top-Up injection of the SOLEIL II accelerator upgrade. The requirements for this device regarding its magnetic characteristics are challenging. In this thesis, a comprehensive magnetic study of the eddy-current septum magnet is carried out using detailed finite element simulation. A particular focus lies on the magnetic shielding performance of the septum blade down to the micro-Tesla level to ensure a stable operation of the SOLEIL II accelerator.