Author: Miltchev, V.
Paper Title Page
WEOCN6 Femtosecond Resolved Determination of Electron Beam and XUV Seed Pulse Temporal Overlap in sFLASH 1452
 
  • R. Tarkeshian, A. Azima, J. Bödewadt, F. Curbis, M. Drescher, Th. Maltezopoulos, V. Miltchev, M. Mittenzwey, J. Rönsch-Schulenburg, J. Roßbach
    Uni HH, Hamburg, Germany
  • H. Delsim-Hashemi, K. Honkavaara, H. Schlarb, S. Schreiber
    DESY, Hamburg, Germany
  • R. Ischebeck
    PSI, Villigen, Switzerland
 
  sFLASH is a seeded experiment at the Free-Electron Laser FLASH in Hamburg. It uses a 38nm High-Harmonic-Generation (HHG) scheme to seed the FEL-process in a 10 m long variable-gap undulator. The temporal overlap between the electron and HHG pulses is critical to the seeding process. The use of a 3rd harmonic accelerating module provides a high current electron beam with ~400 fs bunch duration. The duration of the HHG laser pulse is ∼20 fs. The desired overlap is achieved in two steps. Firstly, the HHG drive laser is synchronized to the incoherent spontaneous radiation from an upstream undulator with picosecond resolution. Next, the coherent radiation from an undulator is used to determine the exact overlap of the electron beam in a modulator-radiator set-up.  
slides icon Slides WEOCN6 [1.758 MB]