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A nonlinear Eulerian beam wave interaction (BWI) theory with a series of phase expansion for traveling wave tubes (TWTs) has been put forward, which is based on the result that the phase expansion can obtain more accuracy by numerical comparison of the AC harmonic currents and phase expansion components in the nonlinear region. The phase equation in Lagrangian nonlinear BWI theory has been conducted...
An analysis of the effect of positive dispersion in input circuit of broadband helix Traveling-Wave tubes (TWTs) is put forward. Using the positive dispersion at the start of the input circuit, the frequencies at high band is synchronized while the low band is not. Thus, the interaction length of high band frequencies is extend, while the low band wave is delayed to be interaction, and the parasitic...
An analysis of harmonic reduction with negative dispersion for broadband helix Traveling-Wave tubes (TWTs) is put forward. The synchronization of the harmonic content is reduced by the decrease of the phase velocity of fundamental wave demonstrated by the field relative phase. A 6∼18GHz TWT is designed with a negative dispersion to improve the output power at low frequency by harmonic reduction and...
A nonlinear beam-wave interaction has be built to simulate the BWO in Helical traveling wave tube, which is in the above of 1D beam-wave interaction model by field theory, And taking into account of angular speed which are affected by magnetic fields. The CN with different QC has be compared to equivalent circuit in small signal, that the result is close. Also, the simulated results are accorded with...
Using beam wave interaction simulator (BWIS), one module of microwave tube simulator suite (MTSS), a wideband helix TWT has been accurately simulated. The slow-wave circuit parameters are calculated by high frequency circuit simulator.
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