• S. Rimjaem, J.W. Bähr, H.-J. Grabosch, M. Hänel, Ye. Ivanisenko, G. Klemz, M. Krasilnikov, M. Mahgoub, M. Otevrel, B. Petrosyan, S. Riemann, J. Rönsch-Schulenburg, R. Spesyvtsev, F. Stephan
  DESY Zeuthen, Zeuthen
• G. Asova, L. Staykov
  INRNE, Sofia
• K. Flöttmann, S. Lederer, S. Schreiber
  DESY, Hamburg
• L. Hakobyan, M.A. 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), high bright­ness elec­tron sources for linac based Free Elec­tron Lasers (FELs), like FLASH and the Eu­ro­pean XFEL are de­vel­oped and char­ac­ter­ized. The elec­trons are gen­er­at­ed via the pho­to­ef­fect at a ce­sium tel­luride (Cs2Te) cath­ode and are ac­cel­er­at­ed by a 1.6-cell L-band RF-gun cav­i­ty with an ac­cel­er­at­ing gra­di­ent at the cath­ode of about 60 MV/m. The pro­file of the cath­ode laser pulse has been op­ti­mized yield­ing small emit­tances using laser pulse shap­ing meth­ods. The trans­verse pro­ject­ed emit­tance is mea­sured by a sin­gle slit scan tech­nique. The mea­sure­ment pro­gram in the last run pe­ri­od at PITZ con­cen­trat­ed on emit­tance mea­sure­ments for the nom­i­nal 1 nC beam and emit­tance op­ti­miza­tion for lower bunch charges. The re­cent re­sults show that nor­mal­ized pro­ject­ed emit­tances of about 1 mm-mrad for 1 nC charge and below 0.5 mm-mrad for 250 pC bunch charges can be re­al­ized at PITZ. The fa­cil­i­ty setup and mea­sure­ment re­sults in­clud­ing the un­cer­tain­ty of the mea­sured val­ues will be 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

As the first su­per­con­duct­ing rf pho­to-in­jec­tor (SRF gun) in prac­tice, the FZD 3+1/2 cell SRF gun is suc­cess­ful­ly con­nect­ed to the su­per­con­duct­ing linac ELBE. This set­ting will im­prove the beam qual­i­ty for ELBE users. It is the first ex­am­ple for an ac­cel­er­a­tor fa­cil­i­ty fully based on su­per­con­duct­ing RF tech­nol­o­gy. For high av­er­age power FEL and ERL sources, the com­bi­na­tion of SRF linac and SRF gun pro­vides a new chance to pro­duce beams of high av­er­age cur­rent and low emit­tance with rel­a­tive low power con­sump­tion. The main pa­ram­e­ters achieved from the pre­sent SRF gun are the final elec­tron en­er­gy of 3 MeV, 16 μA av­er­age cur­rent, and rms trans­verse nor­mal­ized emit­tances of 3 mm mrad at 77 pC bunch charge. A mod­i­fied 3+1/2 cell nio­bi­um cav­i­ty has been fab­ri­cat­ed and test­ed, which will in­crease the rf gra­di­ent in the gun and thus bet­ter the beam pa­ram­e­ters fur­ther. In this paper the sta­tus of the in­te­gra­tion of the SRF gun with the ELBE linac will be pre­sent­ed, and the lat­est re­sults of the beam ex­per­i­ments will be dis­cussed.