• S. Rimjaem, J.W. Bähr, C.H. Boulware, H.-J. Grabosch, M. Hänel, Ye. Ivanisenko, G. Klemz, M. Krasilnikov, M. Otevrel, B. Petrosyan, S. Riemann, J. Rönsch, R. Spesyvtsev, F. Stephan
  DESY Zeuthen, Zeuthen
• G. Asova, L. Staykov
  INRNE, Sofia
• K. Flöttmann, S. Lederer, S. Schreiber
  DESY, Hamburg
• L. Hakobyan, M.K. Khojoyan
  YerPhI, Yerevan
• M.A. Nozdrin
  JINR, Dubna, Moscow Region
• B. D. O'Shea
  UCLA, Los Angeles, California
• R. Richter
  Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin
• A. Shapovalov
  MEPhI, Moscow
• G. Vashchenko
  NSC/KIPT, Kharkov
• I. Will
  MBI, Berlin

At the Photo Injector Test facility at DESY, Zeuthen site, (PITZ) development and optimization of high brightness electron sources for Free Electron Lasers (FELs) like FLASH and the European XFEL are performed. In 2008, the PITZ facility was substantially upgraded. A new 1.6-cell L-band RF-gun cavity treated with an improved surface cleaning technique, a new photocathode laser system allowing shorter rise and fall times of the flat hat temporal distribution and several new diagnostics components have been installed. Since the transverse emittance is a key property of high brightness electron sources a major part of the measurement program at PITZ is devoted to the transverse phase space optimization. Recent results of emittance measurements using the upgraded facility are reported and discussed in this contribution.

• J.H. Han, J. Rowland
  Diamond, Oxfordshire
• K. Flöttmann, S. Schreiber
  DESY, Hamburg

Linac based Free Electron Lasers require very high quality and stable electron beams both for the lasing process, and for use of the FEL beams in experiments. Various kinds of jitter in the injector may sensitively affect the FEL operation. In this paper, we study the jitter sources in the FEL injector and simulate how much they impact on the beam dynamics. Then, we discuss the required jitter tolerances to maintain good machine performance. Measurements have been carried out at the FLASH Free Electron Laser at DESY and beam dynamics simulations are applied to the UK's New Light Source facility.