Nonlinear model for thermal effects in free-electron lasers
Abstract
In the present work, we extend results of a previous paper [Peter et al., Phys. Plasmas 20, 12 3104 (2013)] and develop a semi-analytical model to account for thermal effects on the nonlinear dynamics of the electron beam in free-electron lasers. We relax the condition of a cold electron beam but still use the concept of compressibility, now associated with a warm beam model, to evaluate the time scale for saturation and the peak laser intensity in high-gain regimes. Although vanishing compressibilites and the associated divergent densities are absent in warm models, a series of discontinuities in the electron density precede the saturation process. We show that full wave-particle simulations agree well with the predictions of the model.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 01, 2014
- Source ID
- 10.1063/1.4901241
Entities
People
- A. Endler
- E. Peter
- F. B. Rizzato
Organizations
- Air Force Office of Scientific Research
- Federal University of Rio Grande do Sul