Collective Free Electron Laser Theory
Abstract
The long-pulse induction linac is considered for the first stage of a two-stage free electron laser (FEL) oscillator. This research effort studies several effects that can significantly influence the performance of such an FEL. The FEL is parameterized in a set of dimensionless variables that can summarize several physical effects without the use of detailed calculation as well as relating the physical to other FEL designs. A waveguide analysis shows the primary modifications on the FEL interaction, electron beam distribution functions representing energy spread and emittance are evaluated in the high gain regime, and a multimode analysis of the trapped-particle instability is performed for parameters describing the FEL. The research in intended to extend the simulation theory of high-gain FEL oscillators. In the two-stage FEL, the first-stage uses a normal FEL interaction with the usual static undulator to produce an intense electromagnetic wave in a high-power resonator. The wavelength in the first stage is around 1 cm, and provides the periodic undulator in the second stage of the interaction. The electromagnetic undulator has a shorter wavelength with a more intense field than can be attained from a static magnetic field, and allows the second stage to reach short optical wavelengths with a low energy electron beam.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1988
- Accession Number
- ADA220750
Entities
People
- W. B. Colson