LINAC2026 - 33rd Linear Accelerator Conference

Design for a Femtosecond-Synchronized Nanosecond Laser Pulse Train System for the Korea-4GSR Photocathode RF Gun

Not scheduled

2h

Daejeon Convention Center

Poster Presentation MC1.A02 Electron and ion sources, guns, photo injectors, charge breeders Poster Session

Speaker

Namseok Go (Pohang Accelerator Laboratory)

Description

The Korea-4GSR injector requires a highly stable and precisely synchronized laser pulse train system for multi-bunch operation of the photocathode RF gun. To support this requirement, a laser system capable of generating nanosecond-interval pulse trains with femtosecond-level timing synchronization is being designed.
The proposed system employs a beam-split, delay, and recombination scheme to generate a 64-pulse train with 2 ns spacing synchronized to a 500 MHz RF reference. In addition, a 500 MHz femtosecond oscillator is being considered for integration into the system to enable precise timing diagnostics and long-term synchronization stability.
The synchronized laser system is expected to provide improved timing stability and reliable operation for both single-bunch and multi-bunch injector modes of Korea-4GSR. This paper presents the overall design concept of the laser pulse train generation system and the planned synchronization and diagnostic configuration.