Material science and technical solutions to optimise laser surface treatment for electron cloud mitigation

• Elena Annelie Bez

Room: 30/7-018 - Kjell Johnsen Auditorium Surface roughening using ultrashort pulse lasers efficiently reduces the secondary electron yield (SEY) of a surface. The properties of the resulting surface structures can be tailored by adjusting the laser processing parameters. In this study, laser processing was performed on inner beam screen surfaces using a dedicated setup composed of a picosecond laser source, a beam coupling system, a 15m long hollow-core fiber, and a robot that travels inside the beam pipe. An optimized solution for mitigating electron clouds in the 10m long Q5 standalone magnets of the LHC is developed by considering technical and material aspects. In addition, the large-scale laser treatments of beam screens and vacuum chambers will be presented.