Study of Ultra-High-Vacuum Properties of Carbon-Coated Stainless Steel Beam Pipes for High-Energy Particle Accelerators

摘要

Ultra-high vacuum (UHV) in high-energy particle accelerator is essential to ensure the required beam lifetime. In the present communication, the UHV characterization of vacuum chambers coated with a thin film of carbon is reported. Recently, such coatings have attracted the interest for their low secondary electron yield and, consequently, their capability to eradicate electron cloud in high-intensity proton beam accelerators. Carbon was coated on stainless steel beam pipes by magnetron sputtering. Coated and uncoated stainless steel pipes (Cssp and UCssp) were compared based on their outgassing rates and electron-stimulated desorption yields. The study conclusively verified that magnetron-sputtered carbon coatings are compatible with the requirements of most of the modern particle accelerators.