In the presented paper problems of particles dynamics in linear electron accelerators with standing wave are discussed. The focus of the study is a possibility of use of focusing properties of electromagnetic accelerating field for passing an electronic beam through aperture of biperiodic slow-wave structure (BSS), which will lead to a significant reduction of an accelerator's sizes. The calculation methodology is proposed and results of the study of particle dynamics in accelerators with standing wave based on BSS are presented, which prove a possibility of beam passing without using external focusing elements. The proposed methodology can be used for a calculation and design of linear electron accelerator (LEA).Keywords: linear electron accelerator, biperiodic slow-wave structure, standing wave, particle dynamics, aperture of passing channel, power lines of electric field, electromagnetic field of cell, passing bushing, range of sustainable radial motion, acceleration range, field of passing channel

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