Design of 3 MeV electron linac prototype for irradiation research facility

Abstract The design of 3 MeV electron linac prototype for irradiation research facility has been done. The electron linac is designed to have a focusing beam and scanning beam outputs that can be used for multi-purpose applications. In this linac design, we decided to use a magnetron with a frequency of 2.998 GHz because it is cheaper than a klystron. We also decided to use a commercial electron gun to generate a beam current of 100 mA. The design was performed by simulating the electric field of the RF linac cavities using CST microwave studio program. Then, a particle tracking simulation was carried out using ASTRA code to check the linac cavities working well. The geometry of the cavity plays a role in producing a good design. Therefore, the optimal parameters can be obtained by varying its geometry. The design result shows that the linac cavities can resonate at frequency of 2.998 GHz and can accelerate electron beam up to 3 MeV. The cavity bore size of 3.5 mm is sufficient to pass most of the particles to the end of the cavity. Meanwhile, the required RF peak power for operating 100 mA electron beam peak current is 0.8631 MW with a repetition rate of 200 Hz.