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The advantages of linear induction accelerators (LIA) include high acceleration rate (1 Mev/m), high accelerated beam current values (up to 10 kA), capability of operating in a rep- rate (a few kilohertz) regime, high (up to 90%) efficiency of conversion of the power supply energy to the electron beam energy. The Tomsk Institute of Nuclear Physics (INT) has recently implemented the supply system and a few original LIA's. LIA's are meant to energize relativistic microwave oscillators with pulse power in the beam of 2-5 GW for a pulse duration of 50-100 ns. This paper presents the results of experimental investigations of two LIA's operating simultaneously. It has been done to realize coherent operation of two relativistic magnetrons. Locking of the accelerators is performed by the common start switch gap. As a load for each accelerator use is made of a relativistic magnetron with an intrinsic system of magnetic fields created by two coils forming Helmholtz couple. For a charging voltage of the forming lines of each accelerator of 50 kV there form the pulses on the cathodes of 400 kV with a pulse duration of 80 ns and a current up to 5 kA. The switch jitter is less than 5 ns.© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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.

We report on the main elements of design of a periodic-pulse relativistic magnetron supplied from an induction linac. Operating in a 10-cm wavelength range, the magnetron provides for a pulse power of 200 MW, an average power of up to 3 kW, and a pulse repetition rate of 320 Hz.