Author: Roussel, E.
Paper Title Page
Laser-induced CSR: Toward a Probe to Explore Wakefields in Storage Rings  
  • S. Bielawski, C. Evain, E. Roussel, C. Szwaj, T. Tanikawa
    PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
  • M. Adachi, M. Katoh
    UVSOR, Okazaki, Japan
  • M. Hosaka, N. Yamamoto
    Nagoya University, Nagoya, Japan
  • M. Le Parquier
    CERLA, Villeneuve d'Ascq, France
  • H. Zen
    Kyoto University, Institute for Advanced Energy, Kyoto, Japan
  In a storage ring, it is possible to imprint a sine modulation in the longitudinal phase space of an electron bunch, using interaction with an external laser. This typically leads to narrowband THz emission, as has been demonstrated at UVSOR-II*. This opens a new way to explore the dynamics of electrons bunches, by monitoring the transient following the sine perturbation. Here, we perform this type of experimental study at UVSOR, just below the CSR instability threshold. Then we perform corresponding numerical calculations using a Vlasov-Fokker-Planck modeling, including CSR wakefield. The data provided by these "laser manipulation experiments" are dependent on the wakefields, for some ranges of the excited wavenumber. Hence these laser experiments provide a new tool for testing dynamical models of storage rings, as CSR instability models.
* C. Evain et al., Phys. Rev. ST Accel. Beams 13, 090703 (2010); S. Bielawski et al., Nature Physics 4, 390 (2008).
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