2013/10/10 by Jia Qika, Qika, Jia
Engineering · Physics and Astronomy · #Accelerator Physics (physics.acc-ph) #FOS: Physical sciences #Laser Design and Applications #Particle Accelerators and Free-Electron Lasers #Photonic and Optical Devices #physics.acc-ph
paper · pdf · doi:10.48550/arxiv.1310.2692
arxiv created 2013/10/10 · openalex publication_date 2013/10/10 · arxiv updated 2013/10/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A simple analysis is given for optimum length of undulator in self-seeding free electron laser (FEL). The obtained relations show the correlation between the undulator length and the system parameters. The power required for the seeding in the second part undulator and overall efficiency to monochromatizating the seeding settle on the length of the first part undulator; the magnitude of seeding power dominates the length of the second part undulator; the whole length of the undulators in self-seeding FEL is determined by the overall efficiency to get coherent seed, it is about half as long again as that of SASE, not including the dispersion section. The requirement of the dispersion section strength is also analyzed.