Free Electron Lasers with Slowly Varying Beam and Undulator Parameters
Conference
·
OSTI ID:890810
The performance of a free electron lasers (FEL) is affected when the electron beam energy varies alone the undulator as would be caused by vacuum pipe wakefields and/or when the undulator strength parameter is tapered in the small signal regime until FEL saturation. In this paper, we present a self-consistent theory of FELs with slowly-varying beam and undulator parameters. A general method is developed to apply the WKB approximation to the beam-radiation system by employing the adjoint eigenvector that is orthogonal to the eigenfunctions of the coupled Maxwell-Vlasov equations. This method may be useful for other slowly varying processes in beam dynamics.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 890810
- Report Number(s):
- SLAC-PUB-11239; TRN: US0604806
- Resource Relation:
- Conference: Contributed to Particle Accelerator Conference (PAC 05), Knoxville, Tennessee, 16-20 May 2005
- Country of Publication:
- United States
- Language:
- English
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