A New Concept of Designing PBG Fractal Double-Gap Resonators for Miniature Low Voltage X-Band Cluster Super Multi-Beam Klystrons

This paper is dedicated to the study of the possibility of creating a low voltage multi-beam klystron in the Ku-frequency range with a level of output pulse power of about 7 kW. The klystron resonator system contains the “tree -like” quasi-fractal double-gap resonators, which contains six drift tubes. Each drift tube has channels for 19 beams that interact with one half-wave of the RF electric field. Resonators are equipped with photonic band gap (PBG) “traps” in the form of clusters of metal and ceramic rods to remove parasitic modes of oscillations. The PBG “trap” discussed here is a cluster of macroscopic metallic/dielectric rods arranged in a periodic lattice. For modeling, analysis and design of a new resonator, we first used the modernized method of movable cellular automata, in which cell growth occurs on a hexagonal fractal grid. The paper presents the results of three-dimensional numerical simulation of the beam-wave interaction behavior of such a resonant system and shows the possibility of flexible control of its electro dynamic parameters and characteristics.