Weiland, T.
(Thomas Weiland)
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.
TUPOS10
The Short-Range Wakefields in the BTW Accelerating Structure of the Elettra Linac
Paolo Craievich, Gerardo D'Auria (Elettra, Basovizza, Trieste), Thomas Weiland, Igor Zagorodnov (TU Darmstadt, Darmstadt)
Future FEL operations in the ELETTRA LINAC require a high quality beam with an ultra short bunch. The knowledge of the short-range wakefields in the backward traveling wave (BTW) accelerating structure is needed to predict the beam quality in term of the single bunch energy spread and emittance. To calculate the effect of the longitudinal and transverse wakefileds we have used the time domain numerical approch with a new implicit scheme for calculation of wake potential of short bunches in long structure [1,2]. The wake potentials of the BTW structure are calculated numerically for very short bunches and analytical approximations for wake functions in short and long ranges are obtained by fitting procedures based on analytical estimations.