Potential of a longitudinally focusing insertion for a storage ring X-ray FEL

TL;DR

This paper explores a longitudinal focusing device for storage rings that could generate intense, short photon pulses in the nanometer range, enhancing brightness and pulse duration without requiring FEL saturation.

Contribution

It introduces a novel longitudinal focusing method for storage rings that can produce high-brightness, ultra-short photon pulses, expanding capabilities of existing synchrotron facilities.

Findings

Potential to generate 1 ps photon pulses in the nm range

Can increase brightness and shorten photon pulse length

Operates effectively without FEL saturation

Abstract

In present work we investigate the potential of a longitudinally focusing device to compress bunches passing an undulator for a synchrotron storage ring. If integrated into a storage ring similar to PETRAIII such device could potentially produce continuous $\sim$1ps pulses of photons in the $nm$ range with peak pulse powers of tens of GW. Even without operating in FEL saturation mode the longitudinal focusing can provide means to increase the brightness and shorten the photon pulse length.