Title :
Coherent spontaneous emission in high gain free-electron lasers
Author :
Huang, Zhirong ; Kim, Kwang-Je
Author_Institution :
Argonne Nat. Lab., Idaho Falls, ID, USA
Abstract :
We investigate finite pulse effects in self-amplified spontaneous emission (SASE), especially the role of coherent spontaneous emission (CSE) in the start and the evolution of the free-electron laser (FEL) process. When the FEL interaction is negligible, we solve the one-dimensional Maxwell equation exactly and clarify the meaning of the slowly varying envelope approximation (SVEA). In the exponential gain regime, we solve the coupled Vlasov-Maxwell equations and extend the linear theory to a bunched beam with energy spread. A time-dependent, nonlinear simulation algorithm is employed to study the CSE effect for a general beam distribution
Keywords :
Maxwell equations; Vlasov equation; free electron lasers; particle beam bunching; superradiance; 1D Maxwell equation; FEL; SASE; beam distribution; bunched beam; coherent spontaneous emission; coupled Vlasov-Maxwell equations; energy spread; exponential gain regime; finite pulse effects; high gain free-electron lasers; linear theory; selfamplified spontaneous emission; slowly varying envelope approximation; time-dependent nonlinear simulation; Electron beams; Electron emission; Free electron lasers; Laser beams; Laser theory; Maxwell equations; Optical coupling; Optical pulses; Spontaneous emission; Undulators;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.792743
