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 sec- tion was designed (1, 2) and installed to characterize the momentum distribution, the longitudinal phase space dis- tribution and the transverse slice emittance of the electron bunch for an electron energy up to 40 MeV. The spectrom- eter 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 lon- gitudinal phase space distribution. The first measurement results and corresponding beam dynamics simulations of the momentum and the longitudinal phase space distribu- tions will be reported in this contribution. The resolution of the system will be analysed and compared to the design expectations.