Electromagnetic Particle Algorithm for Beam–Wave Interaction in Traveling Wave Tube of Symmetry

In many fields, such as space astrophysics, plasma and vacuum electronics, there are nonlinear strong coupling physical problems. order to solve the problem of electron beam–wave interaction in cylindrical Traveling wave tube (TWT) with symmetrical structure, a multi particle simulation algorithm for beam circuit is designed. The allows aperiodic time input, nonuniform linearity large diagnosis different particles. this algorithm, field coupled slow-wave transmission line simulated by finite difference method. Assuming that between circuit, center equation along obtained, charge modeled considering effect, which can easily be ignored. Particle Cell (PIC) method frog leaping step scheme adopted evaluate electric each center, determine field, design termination part compensate loss avoid self-excited agitation. Finally, simple numerical carried out electromagnetic accuracy code checked against simulator CHPIC. Therefore, used interactions fixed structure (cylindrical) multiple fields accurately record data process.