Finitetemperature effects in freeelectron lasers
Abstract
The effect of energy spread on the gain of a densebeam freeelectron laser amplifier is analyzed. The formalism includes collective effects and allows for the use of an arbitrary distribution function. The dispersion relation is solved numerically. Besides broadening of the spectrum and decrease in gain, lowering of the central emission frequency with energy spread is observed. An initialvalue problem is formulated and numerically solved, with power computed as a function of distance. The relative contributions of the different modes when temperature changes are analyzed. In particular, the competing effects of a decrease in coupling loss with temperature together with Landau damping are investigated.
 Publication:

IEEE Journal of Quantum Electronics
 Pub Date:
 March 1983
 DOI:
 10.1109/JQE.1983.1071850
 Bibcode:
 1983IJQE...19..339I
 Keywords:

 Free Electron Lasers;
 Laser Stability;
 Light Amplifiers;
 Power Gain;
 Temperature Effects;
 Wave Dispersion;
 Electron Beams;
 Energy Dissipation;
 Frequency Response;
 Landau Damping;
 Optical Coupling;
 Particle Flux Density;
 Lasers and Masers