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free-electron-laser

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IT03 Diagnostics and Instrumentation for FEL instrumentation, diagnostics 11
 
  • M.E. Couprie
    LURE, Service de Photons, Atomes et Molécules, Saclay Lab. d'Utilisation du Rayonnement Électromagnétique, Orsay, France
  Free Electron Laser are coherent sources of radiation based on the interaction of a relativistic electron beam in an undulator field. According to the energy of the accelerator, they presently cover a wide spectral range, from the infra-red to the VUV. FELs combine the diagnostics of typical laser systems (for the measurement of spectral and temporal characteristics, the transverse mode pattern, the polarisation) and the diagnostics of relativistic electron beams. The electron beam is characterised in order to evaluate and control the FEL performances, but also in order to measure the effect of the FEL on the electron beam. The FEL characteristics are monitored with various types of detectors, depending mainly on the spectral range. Diagnostics for Linac based Infra Red FELs and storage ring FELs in the UV-VUV will be described. Particular instrumentation, required for FEL operation, such as the optical resonator, possible diagnostics inside the undulator will also be analysed.  
 
PS21 Diagnostics for the Photon Injector Test Facility in Desy Zeuthen instrumentation, diagnostics, PITZ, linac, emittance 154
 
  • J. Bähr, I. Bohnet, D. Lipka, H. Lüdecke, F. Stephan, Q. Zhao
    DESY-Zeuthen, Deutsches Elektronen-Synchrotron, Zeuthen, Germany
  • K. Flöttmann
    DESY, Deutsches Elektronen-Synchrotron, Hamburg, Germany
  • I. Tsakov
    NRNE, Institute for Nuclear Reseach and Nuclear Energy of the Bulgarian Academy of Science, Sofia, Bulgaria
  A Photo Injector Test facility (PITZ) is under construction at DESY-Zeuthen. The aim is to develop and operate an optimized photo injector for future free electron lasers and linear accelerators. This concerns especially minimal transverse emittances and proper longitudinal phase space. The commissioning of the photo injector will take place in summer 2001. In the rst phase the energy of the produced electrons is about 5 MeV. A short description of the setup and beam parameters are given. Optimization of an electron gun is only possible based on an extended diagnostics system. The diagnostics system for the analysis of the transversal and longitudinal phase space will be described. It consists of a measurement system of the transversal emittance, a TV-based image measurement system, a streakcamera measurement facility, a spectrometer using a dipole magnet and further detectors. Problems of the measurement of the longitudinal phase space are discussed in detail.