Evolution of long pulses in a tapered wiggler free-electron laser
The evolution of a long pulse (pulse length much greater than the slippage distance) in a tapered wiggler free-electron laser was studied by numerical solution of the 1-D theoretical model for a realistic set of magnet, electron beam, and optical resonator parameter values. Single-pass gain curves were calculated for low and high light intensity. It was found that an initial, low-amplitude, incoherent pulse grows into a coherent pulse whose growth rate agrees with the calculated small signal gain. The transient evolution of coherent pulses was calculated for several different cavity length detunings, and a quasi steady-state desynchronism curve is given. The frequency changing behavior of the optical pulse is shown to occur through sideband generation associated with synchrotron oscillations. Pulse evolution with an ideal intracavity high-pass optical filter is calculated.
- Research Organization:
- Los Alamos National Lab., NM
- OSTI ID:
- 5780786
- Journal Information:
- Proc. Soc. Photo-Opt. Instrum. Eng.; (United States), Vol. 453
- Country of Publication:
- United States
- Language:
- English
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Evolution of long pulses in a tapered wiggler free electron laser
Evolution of long pulses in a tapered wiggler-free electron laser