Stimulated excitation of resonant Cherenkov radiation at a large number of neighbouring waveguide modes

TL;DR

This paper investigates how a train of electron bunches can stimulate Cherenkov radiation across many waveguide modes inside a dielectric-filled cylindrical waveguide, with potential applications in terahertz radiation.

Contribution

It demonstrates the stimulated excitation of Cherenkov radiation at multiple neighboring waveguide modes in a dielectric-filled cylindrical waveguide, providing a visual explanation and discussing terahertz observation possibilities.

Findings

Multiple waveguide modes can be stimulated simultaneously.

Visual explanation of the mode excitation mechanism.

Potential for terahertz radiation generation.

Abstract

The resonance Cherenkov radiation generated from a train of equally-spaced unidimensional electron bunches travelling along the axis of a hollow channel inside an infinite cylindrical waveguide filled with (weakly dispersing) transparent dielectric has been investigated. It was shown that its excitation might be stimulated at a large number of neighboring modes of the waveguide. A visual explanation of this effect is given and the possibility of its observation in the range of terahertz radiation is discussed.