• Citer

Deep saturation dynamics in a Free Electron Laser

par Bachelard, Romain;Couprie, Marie-Emmanuelle;de Buyl, Pierre ;De Ninno, Giovanni;Fanelli, Duccio;Ruffo, Stefano;Chandre, Cristel;Leoncini, Xavier
Référence FEL2009(23 - 28 August 2009: Liverpool, UK), Proceedings of FEL2009
Publication Publié, 2009-08-24

Publication dans des actes

• Détails
• Contenu

Résumé :

The Free Electron Laser (FEL) regime is investigated long after saturation using the Colson-Bonifacio model. This regime is actually an out-of-equilibrium metastable state, which slowly relaxes toward thermodynamical equilibrium. This specific dynamics is characterized by a strong regularity, unexpected for an interaction between waves and large number of particles, as well as by low-dimensional phase-space structures in the electron-beam phase space. In this context, the switch from regimes associated to high gain (for small electron-beam energy spread) or very low gain (for large energy spread) is interpreted as out-of-equilibrium phase transitions, a phenomenon which was recently described by a mechanism of entropy maximization.