Pulse splitting in short wavelength seeded free electron lasers.
We investigate a fundamental limitation occurring in vacuum ultraviolet and extreme ultraviolet seeded free electron lasers (FELs). For a given electron beam and undulator configuration, an increase of the FEL output energy at saturation can be obtained via an increase of the seed pulse duration. We put in evidence a complex spatiotemporal deformation of the amplified pulse, leading ultimately to a pulse splitting effect. Numerical studies of the Colson-Bonifacio FEL equations reveal that slippage length and seed laser pulse wings are core ingredients of the dynamics.
Labat
M
M
Synchrotron SOLEIL, Saint Aubin, BP 34, 91 192 Gif-sur-Yvette, France. marie.labat@synchrotron-soleil.fr
Joly
N
N
Bielawski
S
S
Szwaj
C
C
Bruni
C
C
Couprie
M E
ME