Switchyard design for the Shanghai soft x-ray free electron laser facility

TL;DR

This paper proposes a feasible switchyard design for the Shanghai soft x-ray free electron laser, demonstrating minimal beam quality degradation through detailed simulations and analysis of beam dynamics and stability issues.

Contribution

It introduces a novel switchyard design with comprehensive simulation validation for the Shanghai soft x-ray FEL facility.

Findings

Emittance increases less than 10% after switchyard transport.

Peak current, energy spread, and bunch length remain stable.

Microbunching instability and linac jitter are effectively analyzed.

Abstract

In this article, a feasible switchyard design is proposed for the Shanghai soft x-ray free electron laser facility. In the proposed scheme, a switchyard is used to transport the electron beam to different undulator lines. Three-dimensional start-to-end simulations have been carried out to research the beam dynamic during transportation. The results show that the emittance of the electron beam increases less than 10%, at meanwhile, the peak current, the energy spread and the bunch length are not spoiled as the beam passes through the switchyard. The microbunching instability of the beam and the jitter of the linear accelerator (linac) are analyzed as well.