Numerical modeling of the Novosibirsk terahertz FEL and comparison with experimental results

Recently a new high-power terahertz FEL has been put in operation at the Siberian Center for Photochemical Research in Novosibirsk. In this paper, we use a simple 1-D model for numerical simulations of the FEL operation. The model is based on the excitation of multiple longitudinal radiation modes of the optical resonator by the charged discs. We restrict our consideration to the transverse fundamental modes only. The results of numerical simulations are in good agreement with analytical estimates and experimental data.