Investigation of a 2-Colour Undulator FEL Using Puffin

TL;DR

This paper models a two-color free-electron laser (FEL) amplifier using Puffin, demonstrating simultaneous generation at two distinct wavelengths with a single electron beam and tuned undulator modules.

Contribution

It presents the first self-consistent simulation of a 2-colour FEL at widely spaced non-harmonic wavelengths using Puffin.

Findings

Successful generation of two non-harmonic wavelengths at 1nm and 2.4nm

Demonstration of tuning undulator modules for dual-wavelength operation

Use of unaveraged, broadband FEL code Puffin for modeling

Abstract

Initial studies of a 2-colour FEL amplifier using one monoenergetic electron beam are presented. The interaction is modelled using the unaveraged, broadband FEL code Puffin. A series of undulator modules are tuned to generate two resonant frequencies along the FEL interaction and a self-consistent 2-colour FEL interaction at widely spaced non-harmonic wavelengths at 1nm and 2.4nm is demonstrated.