This report describes a design of a multi-beam electron accelerator for beam processing. A wide range of feasible electron beam parameters allows to use these accelerators for various applications (from the environment protection to the treatment of medical and infectious waste). Such accelerators can provide the electron beams with parameters: electron energy 0.1 - 1 MeV, average beam power up to ～500 kW and very large cross section of the electron beam. The accelerator design is based on an use of coaxial spiral-line resonator as high voltage supply and multi-cathode, multi-window electron optical system. Electron pulses are produced by the cold cathodes with a threshold emission characteristic.
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