Seminars Archive

Collective Recoil Lasing: FEL AND CARL.

Abstract


Wednesday, November 17, 2004, 11:30
Seminar Room, ground floor, Building "T"
Sincrotrone Trieste, Basovizza
Collective Recoil Lasing: FEL AND CARL.


Rodolfo Bonifacio

( Dipartimento di Fisica - Universit Statale di Milano)
Abstract
Apparently very different systems as High-Gain Free Electron Laser (FEL) and Collective Atomic Recoil Laser (CARL) exhibit similar behaviors, showing self-bunching and exponential enhancement of the emitted radiation. However, both FEL and CARL can be described by the same model of classical equations. These equations are extended to the quantum domain describing the particle`s motion by a Schroedinger equation coupled to a self-consistent radiation field. Using a proper scaling, the model depends on a single collective parameter r. We demonstrate that the classical model is recovered in the limit r>>1 showing that Wigner function associated to the Schroedinger equation obeys to the classical Vlasov equation. On the contrary, for r<1, a new quantum regime is obtained in which both FELs and CARLs exhibit a dynamical behavior completely different than the classical one. Our theory applies also to a Ions beam as well to a Bose-Einstein condensate. Particular attention will be given to quantum and propagation effect on the high gain regime, SASE and harmonic generation and to possible applications to ions beams and to a Bose Einstein Condensate.