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Proceedings Paper

Relativistic TWT with a rod slow-wave supporting structure and a concept of hybrid antenna-amplifier device
Author(s): Anatoli S. Shlapakovski
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Paper 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.

Paper Details

Date Published: 1 July 1999
PDF: 6 pages
Proc. SPIE 3702, Intense Microwave Pulses VI, (1 July 1999); doi: 10.1117/12.351203
Show Author Affiliations
Anatoli S. Shlapakovski, Tomsk Polytechnical Univ. (Russia)

Published in SPIE Proceedings Vol. 3702:
Intense Microwave Pulses VI
Howard E. Brandt, Editor(s)

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