Author: Bielawski, S.
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).
slides icon Slides MOOBB02 [2.923 MB]  
TUPPP005 LUNEX5: A French FEL Test Facility Light Source Proposal 1611
  • A. Loulergue, C. Benabderrahmane, M. Bessière, P. Betinelli-Deck, F. Bouvet, A. Buteau, L. Cassinari, M.-E. Couprie, J. Daillant, J.-C. Denard, P. Eymard, B. Gagey, C. Herbeaux, M. Labat, A. Lestrade, P. Marchand, J.L. Marlats, C. Miron, P. Morin, A. Nadji, F. Polack, J.B. Pruvost, F. Ribeiro, J.P. Ricaud, P. Roy
    SOLEIL, Gif-sur-Yvette, France
  • S. Bielawski, C. Evain, C. Szwaj
    PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
  • B. Carré
    CEA/DSM/DRECAM/SPAM, Gif-sur-Yvette, France
  • G. Devanz, M. Luong
    CEA/DSM/IRFU, France
  • L. Farvacque, G. Lebec
    ESRF, Grenoble, France
  • G. Lambert, A. Lifschitz, V. Malka, A. Rousse
    LOA, Palaiseau, France
  • M. Le Parquier
    CERLA, Villeneuve d'Ascq, France
  • J. Lüning
    CCPMR, Paris, France
  • R. Roux
    LAL, Orsay, France
  LUNEX5 is a new synchrotron FEL source project aiming at delivering short and coherent X-ray pulses to probe ultrafast phenomena at the femto-second scale, to investigate extremely low density samples as well as to image individual nm scale objects. The proposed machine layout is based on a 400 MeV super-conducting Conventional Linear Accelerator (CLA) mainly composed of 2 XFEL type cryo-modules together with a normal-conducting high brightness photo RF gun. This present mature and reliable technology is able to deliver high quality electron bunches up to few kHz suitable for user experiments. Further more, the last decade improvement in synchronization and stability offer a fertile land to explore the different and innovative seeded FEL operations aiming at producing higher coherence and energetic X-rays for the pilot user full benefits. In parallel of the CLA branch, the very promising and highly innovative Laser Wake-Field Accelerator (LWFA) able to produce very short electron bunches in the range of the femto-second and high peak current up to few GeV is foreseen as a FEL bench test using the same undulator lines.  
TUPPP050 FEL Performances of the French LUNEX5 Project 1712
  • C. Evain, S. Bielawski
    PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
  • C. Benabderrahmane, M.-E. Couprie, C. Evain, M. Labat, A. Loulergue
    SOLEIL, Gif-sur-Yvette, France
  • G. Lambert, A. Lifschitz, V. Malka
    LOA, Palaiseau, France
  LUNEX5 is a french FEL test facility project based on two types of accelerators: a 400 MeV Conventional Linear Accelerator (CLA) and a Laser WakeField Accelerator (LWFA). The FEL performances will be presented at 20 nm and at 12 nm, wavelengths of interest for the pilot experiments. Results are obtained with GENESIS simulations in time-dependent mode. With the CLA, we compare different seeded schemes as EEHG scheme (Echo Enabled Harmonic Generation) or HGHG scheme (High Gain Harmonic Generation) using HHG source (High Harmonic in Gaz). In parallel, LWFA FEL performances will be presented as a function of the electron bunch characteristics, in particular the bunch length and the energy-spread. The transport of the LWFA output beams into undulators which is found to be a critical issue will be also discussed.