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Multiple beam traveling wave tubes (MB-TWTs) are attractive novel devices with enhanced power-bandwidth characteristics1. However, they are more vulnerable to spurious oscillations than single beam TWTs. Therefore, design codes for MB-TWTs should be capable of accurate prediction of MB-TWT operation in steady-state regime as well as prediction of spurious oscillations onset for different modes. Complexity...
Using the Briggs-Bers criterion, we find that the lower band edge of linear beam TWTs is not subjected to absolute instability. At the upper band edge, we find a threshold beam current beyond which absolute instability is excited. In general, an absolute instability would occur in a linear beam tube if the cold-tube circuit dispersion curve in the frequency-wavenumber (ω-k) plane is locally convex...
NRL large signal design codes have been developed recently to be suitable for accurate simulations of multiple beam traveling wave tubes (MB-TWT). MB-TWTs are attractive novel devices with enhanced power-bandwidth characteristics. However, they are more vulnerable to spurious oscillations than single beam TWTs. The results of performance and stability analysis of MB-TWTs with 3D EM codes, NRL 3D PIC...
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