The present research focuses on the mechanical and microstructural characterization performed at CERN on oxygen-free electronic copper (Cu-OFE), one of the materials more commonly used in the manufacturing of radiofrequency (RF) accelerating cavities, with emphasis on how the production stages could influence the overall performance of the final component.

Following a design optimization stage, various copper prototypes were manufactured using a combination of ultra-high precision machining and vacuum brazing joining, with temperatures ranging from 810°C to 1030°C. The assembly process shall ensure a final component compliant with strict requirements like, but not limited to, electrical continuity, vacuum tightness, internal surface roughness of 25 nm, and the preservation of the external and internal geometry of the cell.

Conventional experimental techniques such as Scanning Electron Microscopy (SEM) and Energy-Dispersive X-Ray Spectroscopy (EDS) as well as advanced techniques like Electron Backscatter Diffraction (EBSD) or nano-indentation were employed to compare the impact of the base material fabrication route (forged bars or laminated plates) on the finished pieces behaviour. Additionally, non-ambient X-Ray Diffraction (XRD) is used to evaluate the material stresses as a function of temperature.

The described studies are relevant for well stablished projects in the Organization like the Compact Linear Collider (CLIC) Project and for more recent developments like the FLASH Radiotherapy project, a joint researching between the Lausanne University Hospital (CHUV), TERYQ and CERN to build-up a cutting-edge cancer treatment facility.