Fabrication of the Waveguide Penetration Sections for the PEFP 100MeV Linac

The Proton Engineering Frontier Project (PEFP) 100MeV proton linear accelerator has been developed and will be installed in Gyeong-ju site. The 20MeV Linac already operated in Korea Atomic Energy Research Institute (KAERI) site will be also moved and re-installed with the 100MeV Linac. A waveguide layout was fixed to install HPRF systems for the 100MeV Linac. Currently, the building of the 100MeV Linac is under construction. One of the important interfaces with the building construction is the imbedded waveguide section into the tunnel. 1MW RF power from the klystron is transmitted to each accelerator in the tunnel through the waveguide penetration section. Because the waveguide penetration sections are installed inside the concrete floor of 2.5m for radiation shielding, it is difficult to repair after an installation. The penetration sections were designed and fabricated into a piece of waveguide to prevent the moisture and any foreign debris inside the concrete block. After fabrication, it needs to inspect leakage and the RF characteristic