Robustness Issues of Timing and Synchronization for Free Electron Lasers

TL;DR

This paper examines the robustness challenges in timing and synchronization systems of free electron lasers, emphasizing issues like power cycle effects and proposing solutions for quick recovery and stability.

Contribution

It analyzes specific robustness issues in FEL timing systems and discusses potential design solutions to enhance reliability after power disruptions.

Findings

Identified key robustness issues such as phase uncertainty and race conditions.

Discussed potential solutions for improving timing system resilience.

Highlighted importance of quick recovery to maintain FEL availability.

Abstract

Free electron lasers (FEL) require strict time relations for the electron bunch and RF field interaction, which must be precise and deterministic in time. This is guaranteed by the timing and synchronization systems that should be robust under the situations like a power cycle in the master oscillator, timing master, reference frequency distribution devices or low-level radio frequency (LLRF) devices. After the power cycles, the time relations should be kept or be capable to recover quickly to improve the availability of the FEL machine. This article focuses on the robustness of the timing and synchronization systems, such as the time uncertainty of the RF pulse related with the trigger, the phase uncertainty of frequency dividers after power cycles and the race condition between the trigger and clock. The possible solutions to achieve a robust design of the timing and synchronization systems are also discussed.