Preparation of Multilayer Graphene Sheets and Their Applications for Particle Accelerators

Multilayer graphene sheets were prepared by heat treatment of polyimide films at temperatures of up to 3000 degrees C. The sheets consist of highly oriented graphite layers with excellent mechanical robustness and flexibility. Key features of these sheets include their high thermal conductivity in the in-plane direction, good mechanical properties, and high carbon purity. The results suggest that the multilayer graphene sheets have great potential for charge stripping foils that persist even under the highest ion beam intensities irradiation and can be used for accelerator applications.