Author: Le Parquier, M.
Paper Title Page
Control of the Micro-Bunching Instability in Storage Rings, Using Control of Chaos Strategy (Theory and Experiment)  
  • C. Evain, S. Bielawski, E. Roussel, C. Szwaj
    PhLAM/CERLA, Villeneuve d’Ascq, France
  • J.B. Brubach, N. Hubert, M. Labat, F. Ribeiro, P. Roy, M.-A. Tordeux
    SOLEIL, Gif-sur-Yvette, France
  • M. Le Parquier
    PhLAM/CERCLA, Villeneuve d’Ascq Cedex, France
  We present a new method, inspired by chaos control theory, to master the micro-bunching instability in storage rings *. This instability appears when the bunch current exceeds a threshold value, and is characterized by spontaneous (and usually irregular) apparition of micro-structures in the bunch. We show that a regular state (with regular apparition of micro-structures) can pre-exist in the system, but with unstable properties; and we demonstrate the possibility of stabilizing this state thanks to a low power feedback loop. As a consequence of this method, a modification of less than 0.3% in the system parameters permits to decrease by more than 40 dB the THz fluctuations at the synchrotron SOLEIL (while keeping the coherent emission).
* Coherent Terahertz synchrotron radiation mastered by controlling the irregular dynamics of relativistic electron bunches, C. Evain, et. al., arXiv:1810.11805 (2018)
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