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Yurkov, M.V.

Paper Title Page
TUPCH081 Technical Aspects of the Integration of the Optical Replica Synthesizer for the Diagnostics of Ultra-short Bunches in FLASH at DESY 1199
 
  • V.G. Ziemann
    UU/ISV, Uppsala
  • N.X. Javahiraly, P. van der Meulen
    FYSIKUM, AlbaNova, Stockholm University, Stockholm
  • M. Larsson
    Stockholm University, Department of Physics, Stockholm
  • E. Saldin, H. Schlarb, E. Schneidmiller, A. Winter, M.V. Yurkov
    DESY, Hamburg
 
  In this paper we present an overview of current status of the Optical Replica synthesizer at DESY. The method is based on producing an "optical copy" of the electron bunch with its subsequent analysis with optical techniques*. To this end, a near-IR laser beam is superimposed on the electron beam in the first undulator of an optical klystron. In the following dispersive section the laser-induced energy modulation is transformed into a density modulation . The modulated electron bunch then produces a strong optical pulse in the second undulator. Analysis of this near-IR pulse (the optical copy) then provides information about the profile, the slice emittance and the slice energy spread of the electron bunch. We discuss the implementation of such a measurement set-up at the FLASH facility at DESY and investigate the influence of various parameters on the performance of the device. Topics we address include the dispersive chicane, as well as the requirements for the seed laser pulses and the detection and analysis of the near-IR pulse.

*E. Saldin, et al. "A simple method for the determination of the structure of ultrashort relativistic electron bunches," Nucl. Inst. and Methods A 539 (2005) 499.

 
THPLS133 Simulations of Electromagnetic Undulator for Far Infrared Coherent Source of TTF at DESY 3595
 
  • E. Syresin, V.V. Borisov, E.A. Matushevsky, N.A. Morozov
    JINR, Dubna, Moscow Region
  • O. Grimm, M.V. Yurkov
    DESY, Hamburg
  • J. Rossbach
    Uni HH, Hamburg
 
  A perspective extension of the VUV FEL user facility at DESY is infrared coherent source on the base of electromagnetic undulator. The undulator consists of 9 periods, period length is 40 cm long, and peak magnetic field is up to 1.2 T. With the energy of electron beam of 500 MeV maximum radiation wavelength is about 200 mkm. An important feature of the beam formation system of the VUV FEL is the possibility to produce ultra-short, down to 50 mkm rms electron bunches. Such short bunches produce powerful coherent radiation with multi-megawatt power level. FIR coherent source operates in a parasitic mode utilizing electron beam passed VUV undulator. Generation of two-colors by a single electron bunch reveals unique possibility to perform pump-probe experiments with VUV and FIR radiation pulses. In this report we present simulations of the undulator magnetic system and beam dynamics.