• M. Hänel, G. Klemz, M. Krasilnikov, J. Rönsch, F. Stephan
  DESY Zeuthen, Zeuthen
• I. Will
  MBI, Berlin

The Photo Injector Test facility at DESY, Zeuthen site, PITZ, develops and optimizes high brightness electron sources for Free Electron Lasers such as FLASH and the European XFEL. In last years shutdown period different components of the facility have been upgraded. One of the key upgrades was the installation of a new laser system with a larger spectral bandwidth. This allows for rise- and fall-times of less than 2ps of the temporally flat top laser pulses having a FWHM of up to 25ps. In this paper we report on the investigations of modulations in the electron bunch momentum spectra when modifying parameters of the laser system such as bandwidth or longitudinal pulse shape.

• 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.

• R. Xiang, A. Arnold, H. Büttig, D. Janssen, M. Justus, U. Lehnert, P. Michel, P. Murcek, A. Schamlott, Ch. Schneider, R. Schurig, F. Staufenbiel, J. Teichert
  FZD, Dresden
• T. Kamps, J. Rudolph, M. Schenk
  Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Elektronen-Speicherring BESSY II, Berlin
• G. Klemz, I. Will
  MBI, Berlin

More and more electron accelerator projects for FELs, ERLs or 4th generation light sources require “super” electron beam with high brightness, low emittance, and high average current. Under this background, much attention is paid on the research and development of new electron sources. Superconducting RF photoinjector was designed within a collaboration of BESSY, DESY, FZD, and MBI to improve the beam quality for ELBE IR-FEL users, and at the same time to test this kind of promising injector concept. The main design parameters of this gun are the final electron energy of 9.5 MeV, 1 mA average current, and transverse normalized emittances (rms) of 1 mm mrad at 77 pC and 2.5 mm mrad at 1 nC bunch charge. In this paper the results of the RF and beam parameter measurements with Cs2Te photo cathodes will be presented, and the experience for the gun running gained at the first experiments will be concluded, including the life time and compatibility of the normal conducting photocathode in SC cavity, the coupling of high average power into the gun, and the excitation of higher-order modes in the cavity.

Slides