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The European Physical Journal D

, Volume 59, Issue 3, pp 451–455 | Cite as

Remaining noise-induced spatiotemporal dynamics in a free electron laser stabilized by feedback control

  • C. SzwajEmail author
  • S. Bielawski
  • M.-E. Couprie
  • C. Bruni
  • M. Hosaka
  • A. Mochihashi
  • M. Katoh
Nonlinear Dynamics

Abstract.

We investigate the efficiency of the pulsed regime stabilization by feedback control in a free electron laser (FEL) in oscillator configuration. We show that a hidden dynamics remains in the controlled FEL. Though not visible in the evolution of the pulse envelope, this dynamics affects the internal pulse shape evolution, and thus the FEL spectrum and coherence properties. The experimental results obtained on the UVSOR FEL are interpreted in the framework of a field master equation model. The stochastic nature of spontaneous emission is taken into account, and appears as an essential ingredient since the dynamics of the controlled structures is governed by noise like the other stable regimes of the FEL.

Keywords

Free Electron Laser Electron Bunch Pulse Regime Pulse Envelope Nonstationary Regime 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • C. Szwaj
    • 1
    Email author
  • S. Bielawski
    • 1
  • M.-E. Couprie
    • 2
  • C. Bruni
    • 3
  • M. Hosaka
    • 4
  • A. Mochihashi
    • 4
  • M. Katoh
    • 4
  1. 1.Laboratoire de Physique des Lasers, Atomes et Molécules, UMR CNRS 8523, Centre d’Études et de Recherches Lasers et Applications, FR CNRS 2416, Université des Sciences et Technologies de LilleVilleneuve d’Ascq CedexFrance
  2. 2.Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 34Gif-sur-Yvette CedexFrance
  3. 3.Laboratoire de L’Accélérateur Linéaire, Université Paris-Sud 11, UMR 8607Orsay CedexFrance
  4. 4.UVSOR Facility, Institute for Molecular ScienceOkazakiJapan

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