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1 July 1999 Relativistic TWT with a rod slow-wave supporting structure and a concept of hybrid antenna-amplifier device
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Abstract
Waveguide structure with an inner rod supporting slow-wave propagation allows one to combine a TWT-amplifier and a surface wave radiating antenna in a single hybrid device. Such a device could significantly extend the range of possibilities for microwave beam control at the high level of radiated power. In the work presented, the linear theory is developed for a relativistic Cherenkov amplifier, which configuration is a circular waveguide with an inner dielectric rod and an annular electron beam between the rod and outer wall. Dielectric rod antennas typically operate in the fundamental non-axisymmetric HE11 mode, therefore, the dispersion relation is derived for the general case of non-axisymmetric perturbations. The achievable gain and bandwidth are determined from the numerical solutions of the dispersion relation for various waveguide and beam parameters. Spatial growth rates for the HE11 mode, symmetric TM01 mode (usual TWT operating mode), and other high-order modes are compared. Investigations of the parameter space allow one to find sets of parameters where the HE11 mode dominates. The gain and bandwidth values in this case can be typical for usual relativistic TWTs at accessible beam currents and voltages and reasonable geometries for the X-band frequencies and above. Key characteristics of the proposed concept for a high-power microwave source are formulated, and possible advantages of a hybrid antenna-amplifier are discussed.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Anatoli S. Shlapakovski "Relativistic TWT with a rod slow-wave supporting structure and a concept of hybrid antenna-amplifier device", Proc. SPIE 3702, Intense Microwave Pulses VI, (1 July 1999); https://doi.org/10.1117/12.351203
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