Generation of radiation in free electron lasers with diffraction gratings (photonic crystal) with the variable spacial period

TL;DR

This paper proposes using diffraction gratings with variable periods in free electron lasers to enhance radiation output and develop more efficient, adaptable FEL systems with dynamic wigglers.

Contribution

It introduces a new approach of employing variable-period photonic crystal gratings to improve FEL performance and enable double-cascaded systems with adjustable parameters.

Findings

Variable-period gratings significantly increase radiation output.

Design of a dynamical wiggler with variable period is feasible.

Potential for higher efficiency in FEL systems with this method.

Abstract

The equations providing to describe generation process in FEL with varied parameters of diffraction grating (photonic crystal) are obtained. It is shown that applying diffraction gratings (photonic crystal) with the variable period one can significantly increase radiation output. It is mentioned that diffraction gratings (photonic crystal) can be used for creation of the dynamical wiggler with variable period in the system. This makes possible to develop double-cascaded FEL with variable parameters changing, which efficiency can be significantly higher that of conventional system.