Analysis of longitudinal wiggler-undulator radiation in a parallel plate waveguide

Analysis of angular spectrum of radiation in an undulator magnet

“…The undulating electrons when couple and amplify a co-propagating laser form the basis of free electron laser interaction. In contrast to free space operation, a parallel plate confines the radiation in a waveguide scheme [7][8][9][10][11][12][13][14][15][16][17][18][19]. For each waveguide mode, it has two resonant frequencies.…”