Author: Jing, C.-J.
Paper Title Page
High-efficient XFELO Based on Optical Resonator with Self-modulated Q-factor  
  • C.-J. Jing, S.P. Antipov
    Euclid Beamlabs LLC, Bolingbrook, USA
  • S.P. Antipov
    ANL, Argonne, Illinois, USA
  • S.P. Antipov
    Euclid TechLabs, LLC, Solon, Ohio, USA
  • S.V. Kuzikov, A.V. Savilov
    IAP/RAS, Nizhny Novgorod, Russia
  • A.V. Savilov
    UNN, Nizhny Novgorod, Russia
  We suggest an efficient XFELO having a new non-stationary out-coupling scheme. It consisted of two undulator sections located in sequence with a free space gap in-between. The first section is a conventional uniform undulator, the second one is a tapered undulator. At start time point X-ray radiation is basically produced by the uniform section. Mirrors of XFELO's optical resonator are calculated so that diffraction Q-factor reaches the highest value, i.e losses asre near to zero. As X-ray power increases the tapered undulator begins to bring more contribution in radiation power. Finally, at a new steady state regime all power is being produced by the tapered section. Because mirrors were optimized for Gaussian wavebeam to be produced in the first section, in the final steady state regime a portion of X-ray power will be out-coupled missing partly the mirrors.  
slides icon Slides WEA2WC02 [4.298 MB]  
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A Beam-Driven Short Wavelength Undulator for FEL  
  • C.-J. Jing
    Euclid TechLabs, LLC, Solon, Ohio, USA
  The idea of the beam-driven accelerators where intense electron beams are used directly to drive electromagnetic fields that accelerate probe or 'witness' electron beams has been known as the wakefield acceleraion for decades. This technology presents significant possibilities to accelerate electron beams in a multiGeV scale in a compact footprint. Here we unveil the next logical step in the application of wakefields, using intense electron beams to create fields that directly guide and periodically deflect 'witness" electrons, causing them to radiate photons. This is a new application of wakefield principles that may be used in the near future to develop compact undulators. The combination of a compact accelerator and a compact undulator could lead to a very compact x-ray free-electron laser in the future.  
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