Dynamics control of the Elettra storage ring free-electron laser with digital feedbacks

28th International Free Electron Laser Conference, FEL 2006 2006, Pages 356-359 28th International Free Electron Laser Conference, FEL 2006; Berlin; Germany; 27 August 2006 through 1 September 2006; Code 99557 Dynamics control of the Elettra storage ring free-electron laser with digital feedbacks (Conference Paper) Allaria, E.a , De Ninno, G.a, Antoniazzi, A.b, Fanelli, D.b a Sincrotrone Trieste, 34012 Trieste, Italy b Dept. of Energetics, University of Florence, Florence, Italy View references (10) Abstract The laser dynamics of a storage-ring free-electron laser has two main sources of instabilities. First of all, dynamical instabilities are developed as the free electron laser is moved away from the exact tuning between the period of the electron bunch(es) circulating into the ring and that of the photon pulse stored in the optical cavity. In addition, external (low-frequency) noise sources have a strong influence on the dynamical behavior of the system and can perturb its dynamics. Different feedback techniques have been proposed in order to control dynamical instabilities and stabilize the laser output. We present here a numerical and experimental investigation on the control of the Elettra storage ring free electron laser dynamics using different feedbacks techniques that can be experimentally implemented by means of a Field Programmable Gate Array.