Volume Free Electron Laser with a "Grid" Photonic Crystal in a Cylindrical Waveguide

Abstract

Specific features of Volume Free Electron Laser (VFEL) with a photonic crystal made from the wire grids periodically strained in a waveguide are studied theoretically and experimentally. Electrodynamical properties of a "grid" photonic crystal built in a cylindrical waveguide are reported. Possibility to use it for VFEL lasing in wide frequency range is discussed.

Cherenkov and parametric (quasi-Cherenkov) radiation from relativistic charged particles moving in crystals formed by metallic wires

“…where ε = ε 2 /ε 1 , µ = µ 2 /µ 1 . Formulas (13) are exact for n = 0. If n = 0, these formulas are exact only when k 1x = 0, whereas at small values of k 1x provide the relative error of the order of |k 1x | kρ .…”

“…Radiation produced by charged particles moving in crystals built from parallel metallic wires has been studied in [2,5,6,[12][13][14][15][16][17][18]. The authors of [6,[15][16][17][18] have considered the case when the wavelength is much greater than the crystal period, and so the diffraction conditions are not fulfilled.…”

“…Here the crystal was presented as an equivalent uniform medium characterized by certain permittivity and permeability tensors. Inversely, the authors of [2,5,[12][13][14] have not confine themselves to the analysis of long-wave approximation, because diffraction in crystals is paramount for the considered radiation mechanisms (parametric, diffraction). According to the results reported in [5], when the wavelength λ = 2π/k becomes comparable with the wire radius R (kR ∼ 1) a noticeable increase in the intensity of parametric radiation is observed.…”

Backward wave oscillator with resonator made of metal foils (photonic BWO)

“…High power microwave generation by an electron beam in a waveguide filled by a spatially periodic structure (metamaterial, photonic crystal) is a subject for multiple studies both theoretical and experimental [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13]. A photonic crystal could replace a corrugated waveguide or a diffraction grating, which are usually used as a slow-wave structure (SWS) in conventional relativistic backward wave oscillators (BWOs), free electron lasers (FELs) and other types of vacuum electronic devices.…”

Investigation of Band Gap Width in Ternary 1D Photonic Crystal with Left-Handed Layer

“…PCs have many interesting applications such as omnidirectional re ector [3], lters, optical switches, light-emitting diodes [4], bers [5], waveguides [6] etc. When the light wave is incident on PCs, they face with number of dielectric layers with di erent dielectric constants [7].…”