FEL2026 - 42nd International Free Electron Laser Conference

Session

Advanced FEL Modes (Contributed)

FRB

28 Aug 2026, 11:30

20. Generation and Diagnostics of OAM Beams at the Shanghai Soft X-ray Free-Electron Laser Facility (FRB01)

Yin Kang (Shanghai Advanced Research Institute, Chinese Academy of Sciences)

28/08/2026, 11:30

Session 12: Advanced FEL Modes

Contributed Oral Presentation

A comprehensive framework for the generation and diagnostics of X-ray and THz OAM beams has been successfully established at the Shanghai Soft X-ray Free-Electron Laser (SXFEL) facility. This work effectively bridges the gap between advanced orbital angular momentum (OAM) physics and the stringent beam quality requirements of a high-performance XFEL facility. The ability to produce soft X-ray...

49. Tunable Phase-Locked Hard-X-Ray Pulse Pairs from a Cavity-Based Free-Electron Laser (FRB02)

Jingyi Tang (Stanford University)

28/08/2026, 11:50

Session 12: Advanced FEL Modes

Contributed Oral Presentation

We propose a novel and simple scheme for generating tunable, phase-locked hard-X-ray pulse pairs in cavity-based free electron lasers. A short electron bunch first amplifies one temporal slice of a long coherent cavity field; after a magnetic delay, the same bunch overlaps a fresh seed slice in a second undulator section, producing a second pulse locked to the same optical reference. The...