Author: Karabekyan, S.
Paper Title Page
Study of an External Laser Seeding at the European XFEL  
  • T. Tanikawa, G. Geloni, S. Karabekyan, S. Serkez, S.I. Tomin
    XFEL. EU, Schenefeld, Germany
  Several XFEL facilities are currently in the commissioning or operation phase and have opened new exciting scientific opportunities. In May 2017, the European XFEL successfully achieved a first lasing. Recently, most of the FEL facilities are going to invest (or have already invested) in advanced schemes to increase the longitudinal coherence properties of radiation compared to SASE. As one of the techniques, an external laser seeding is currently applicable at soft X-ray facilities, in a frequency range where external seed pulses are powerful enough to overcome the SASE shot noise. However, these techniques are now also being considered at several hard X-ray FEL facilities and aim for the production of nearly Fourier-limited pulses up to the keV range. At the European XFEL, the challenge of HGHG and EEHG options is the usage of very high electron beam energy. In this presentation, we will report the preliminary simulation results of the external laser seeding feasibility at the European XFEL.  
MOP008 Status of the Hard X-Ray Self-Seeding Project at the European XFEL 1
  • G. Geloni, S. Karabekyan, L. Samoylova, S. Serkez, H. Sinn
    XFEL. EU, Hamburg, Germany
  • V.D. Blank, S. Terentiev
    TISNCM, Troitsk, Russia
  • W. Decking, C. Engling, N. Golubeva, V. Kocharyan, B. Krause, S. Lederer, S. Liu, A. Petrov, E. Saldin, T. Wohlenberg
    DESY, Hamburg, Germany
  • X. Dong
    European X-Ray Free-Electron Laser Facility GmbH, Schelefeld, Germany
  • D. Shu
    ANL, Argonne, Illinois, USA
  A Hard X-ray Self-Seeding setup is currently under realization at the European XFEL, and will be ready for installation in 2018. The setup consists of two single-crystal monochromators that will be installed at the SASE2 undulator line. In this contribution, after a short summary of the physical principles and of the design, we will discuss the present status of the project including both electron beam and X-ray optics hardware. We will also briefly discuss the expected performance of the setup, which is expected to produce nearly Fourier-limited pulses of X-ray radiation with increased brightness compared to the baseline of the European XFEL, as well as possible complementary uses of the two electron chicanes.  
poster icon Poster MOP008 [2.440 MB]  
Generation of Sub-fs X-Ray Pulses at the European XFEL  
  • S. Serkez, G. Geloni, S. Karabekyan, M. Lederer, S.I. Tomin
    XFEL. EU, Hamburg, Germany
  • G. Feng, V. Kocharyan, E. Saldin, I. Zagorodnov
    DESY, Hamburg, Germany
  • A. Kalaydzhyan
    CFEL, Hamburg, Germany
  Time-resolved studies of free electron lasers are of a great importance. The resulting temporal resolution of the user measurements is determined by FEL pulse duration. Here we investigate possibilities to obtain sub-fs-long pulses at the European XFEL. Installation of the drive laser, modulator and magnetic chicane before the baseline undulator is required.  
poster icon Poster TUP044 [0.680 MB]  
Study of a Superconducting THz Undulator at the European XFEL  
  • T. Tanikawa, G. Geloni, S. Karabekyan
    XFEL. EU, Schenefeld, Germany
  • V. B. Asgekar, M. Gensch
    HZDR, Dresden, Germany
  • S. Casalbuoni
    KIT, Eggenstein-Leopoldshafen, Germany
  The European XFEL has successfully achieved a first lasing in May 2017. Meanwhile, a THz radiation for pump-probe experiments etc. is under consideration at the European XFEL using laser-based and/or accelerator-based techniques. A superconducting THz undulator as an afterburner is one option, but a challenge to this approach is the usage of very high electron-beam energy up to 17.5 GeV and the requirement of a high magnetic field. In this presentation, we will report the preliminary study of the THz undulator design and the radiation properties at the European XFEL.