Rossbach, J.
(Joerg Rossbach)
THBOC02 
Recent Results and Perspectives of the Low Emittance Photo Injector at PITZ
Frank Stephan, Juergen Baehr, Ulrich Gensch, Hans-Juergen Grabosch, Jang Hui Han, Mikhail Krasilnikov, Dirk Lipka, Velizar Miltchev, Anne Oppelt, Bagrat Petrosyan, Dietrich Pose, Sabine Riemann, Lazar Staykov (DESY Zeuthen, Zeuthen), Michael von Hartrott, Eberhardt Jaeschke, Dieter Krämer, Dieter Richter (BESSY GmbH, Berlin), Galina Asova, Gancho Dimitrov (DESY Zeuthen, Zeuthen; INRNE, Sofia), Karen Abrahamyan (DESY Zeuthen, Zeuthen; YerPhI, Yerevan), Ilja Bohnet, Jean-Paul Carneiro, Klaus Floettmann, Siegfried Schreiber (DESY, Hamburg), Paolo Michelato, Laura Monaco, Carlo Pagani, Daniele Sertore (INFN/LASA, Segrate (MI)), Ivan Tsakov (INRNE, Sofia), Wolfgang Sandner, Ingo Will (MBI, Berlin), Wolfgang Ackermann, Wolfgang F.O. Mueller, S. Schnepp, Stefan Setzer, Thomas Weiland (TU Darmstadt, Darmstadt), Joerg Rossbach (Uni HH, Hamburg)
The Photo Injector Test Facility at DESY Zeuthen (PITZ) was built to study the production of minimum transverse emittance electron beams for Free Electron Lasers. In November 2003 the electron beam from the RF gun was fully characterized at PITZ. For a bunch charge of 1 nC a minimum normalized projected beam emittance of 1.5 π mm mrad in the vertical plane and a minimum geometrical average of both transverse planes of 1.7 π mm mrad have been achieved. This fulfils the requirements of the VUV-FEL at DESY Hamburg. In this contribution an overview on the measured electron beam and high duty cycle RF parameters including transverse emittance, thermal emittance, bunch length, momentum and momentum spread will be given. In addition, planned major upgrades and first results towards fulfilling the even more challenging requirements for the European XFEL will be discussed. This includes the increase of the accelerating gradient on the photo-cathode and the improvement of the transverse and longitudinal laser beam parameters.
TUPOS07
Longitudinal Bunch Shape Diagnostics with Coherent Radiation and a Transverse Deflecting Cavity at TTF2
Oliver Grimm, Lars Froehlich, K. Klose, M. Nagl, O. Peters, Holger Schlarb (DESY, Hamburg), Paul J Emma, D. McCormick, M. Ross, T.J. Smith (SLAC, Menlo Park, California), Joerg Rossbach (Uni HH, Hamburg)
The VUV-FEL at DESY, Hamburg, will require novel techniques to characterize the longitudinal charge distribution of the electron bunches that drive the free-electron laser. Two reasons are the short bunch lengths that will be obtained by the bunch compression schemes and the high sensitivity of the lasing process to spikes in the charge distribution. This contribution will give an overview of the different measurement techniques to access bunch lengths on the order of 50 μ m. Approaches to reconstruct the bunch shape by Fourier analysis of the coherent part of the infrared spectrum of synchrotron, transition, diffraction and undulator radiation will be presented. Furthermore, methods working in the time domain, like the use of transverse mode cavities or the principle of electro-optical sampling, will be discussed. Examples from TTF2 will be used to show possible technical implementations of the corresponding techniques.