Abstract: The results of modeling and experimental investigations of a linear induction accelerator (LIA) operating with relativistic magnetron as a load are discussed in this report. The mathematic model of the LIA injector section is based on the substitution of all main LIA section parts by equivalent circuits. Satisfactory model quality and reliability of the simulation results are confirmed by good agreement of the calculation results with the experimental data obtained by LIA section operation on the electron beam and resistive load. During the simulation a relativistic magnetron model was used in which the self-consistent effective amplitude of the microwave field fundamental harmonic and, accordingly, the generated power are defined by forming voltage and input current, taking into account output current losses. Optimization of a `power supply - microwave generator' as the unified system on efficiency and generated power will allow us to define the best characteristics of LIA elements and the relativistic magnetron parameters. !6
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