The dynamics of a free-electron laser with short radiation pulses having intensities higher than the steady-state saturation threshold is analysed. This regime, characterized by a superradiant scaling of the power with the e-beam current, may be induced by seeding an FEL amplifier with a high power laser, and is dominated by the interplay between slippage and the non-linear effects associated to saturation. The propagation of superradiant pulses in single pass free electron lasers has been extensively studied with 1D time dependent simulation codes. The superradiant regime is observed also in a three dimensional model and presents a peculiar behaviour in the fact that the radiation transverse size does not blow up when the FEL saturates as it happens in the steady-state regime. The mode is quasi-guided keeping very high the intensity and allowing the non linear effects to dominate the propagation of the wave. In this communication we analyze these effects in the framework of a superradiant free electron laser experiment proposed for the SPARC facility.
|Publication status||Published - 2005|
|Event||27th International Free Electron Laser Conference, FEL 2005 - , United States|
Duration: 1 Jan 2005 → …
|Conference||27th International Free Electron Laser Conference, FEL 2005|
|Period||1/1/05 → …|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
Giannessi, L., Spampinati, S., & Musumeci, P. (2005). Non linear pulse evolution in seeded and cascaded FELs. Paper presented at 27th International Free Electron Laser Conference, FEL 2005, United States.