Stabilization of the naturally pulsed zones of the Super-ACO Storage Ring Free Electron Laser

A Storage Ring Free Electron Laser presents different regimes versus the synchronization between the optical pulses bouncing in the optical cavity and the electron bunches stored in the ring. Both experiments and simulations show that, on Super-ACO, the so-called detuning curve presents five zones: a “CW” regime at the ms time scale in the central and lateral ones, and a pulsed behavior at intermediate detunings. Apart from a longitudinal feedback allowing the FEL to be maintained in the central “cw” region for ensuring a high level of stability for the users, a recent feedback allowed the pulsed regions to be stabilized. The new detuning curves are presented.