Slice collective dynamics, projected emittance deterioration and Free Electron Laser performances detrimental effects

TL;DR

This paper investigates how various dynamical effects cause beam quality degradation in X-ray Free Electron Lasers, impacting their efficiency and output power, and discusses modeling these effects with scaling formulas.

Contribution

It introduces a method to incorporate dynamical effects into models of FEL performance using scaling formulas, enhancing predictive accuracy.

Findings

Dynamical effects lead to slice misalignment and emittance deterioration.

These effects increase saturation length and reduce output power.

Modeling these effects improves FEL performance predictions.

Abstract

The dynamical effects inducing geometrical and phase space misalignment of bunch slice in X-ray operating Free Electron Lasers can be traced back to a plethora of phenomena, both in the linac accelerating section or inside the beam transport optic magnet. They are responsible for a spoiling of the beam projected qualities and induce, if not properly corrected, an increase of the saturation length and a decreasing of the output power. We discuss the inclusion of these effects in models employing scaling formulae.