First measurements of the longitudinal phase space distribution using the new high energy dispersive section at PITZ

The Photo Injector Test facility at DESY, Zeuthen site, PITZ develops and optimizes high brightness electron sources for Free Electron Lasers FELs like FLASH and the European XFEL. A new multi purpose dispersive section was designed [1,2] and installed to characterize the momentum distribution, the longitudinal phase space distribution and the transverse slice emittance of the electron bunch for an electron energy up to 40MeV. The spectrometer consists of a 180 degree dipole magnet followed by a slit, a quadrupole magnet and two screen stations. One of the screen stations allows the measurement of the longitudinal phase space distribution. The first measurement results and corresponding beam dynamics simulations of the momentum and the longitudinal phase space distributions will be reported in this contribution. The resolution of the system will be analysed and compared to the design expectation