IPAC'26 - the 17th International Particle Accelerator Conference

Intrabeam Scattering and 6D Brightness: Modelling, Measurement, and the Road to a Brighter SwissFEL electron source

THP2140

21 May 2026, 16:00

2h

C.I.D

Poster Presentation MC2.T02: Photon sources: Electron Sources Poster session

Speaker

Thomas Lucas (Paul Scherrer Institute)

Description

Intrabeam scattering (IBS) in the SwissFEL injector has been shown to significantly impact performance through a larger-than-expected slice energy spread. Using a combination of numerical modelling and a newly developed analytical formulation, the measured slice energy spreads have been successfully reproduced with strong agreement. This raises an important question of how to mitigate these effects in future operation. Building on this understanding, we have explored new operational schemes to improve FEL performance in the presence of IBS, including velocity and ballistic bunching schemes in the electron source.