Author: Schneider, Ch.
Paper Title Page
MOPC081 Pulsed Mode Operation and Longitudinal Parameter Measurement of the Rossendorf SRF Gun 262
 
  • J. Teichert, A. Arnold, H. Büttig, M. Justus, U. Lehnert, P. Michel, P. Murcek, Ch. Schneider, R. Schurig, R. Xiang
    HZDR, Dresden, Germany
  • T. Kamps, J. Rudolph, M. Schenk
    HZB, Berlin, Germany
  • I. Will
    MBI, Berlin, Germany
 
  Funding: The European Community-Research Infrastructure Activity under the FP7 program (EuCARD, contract number 227579) the German Federal Ministry of Education and Research grant 05 ES4BR1/8.
The Rossendorf SRF gun with a 3 1/2 cell cav­i­ty has been op­er­at­ed since 2007. It has pro­duced CW beam with the elec­tron en­er­gy of 3 MeV and the av­er­age cur­rent up to 16 μA. The elec­tron beam of the gun has suc­cess­ful­ly in­ject­ed the ELBE su­per­con­duct­ing linac since 2010. The Nb cav­i­ty has shown con­stant qual­i­ty dur­ing the op­er­a­tion and for the Cs2Te pho­to­cath­ode life time of months could be ob­tained. Re­cent­ly the gun start­ed to run in the pulsed mode with high­er gra­di­ent. The lon­gi­tu­di­nal pa­ram­e­ters have been mea­sured in this mode. The dark cur­rent arose from the high gra­di­ent is stud­ied. The main field emis­sion source has been found to be the half cell. Mean­while, two mod­i­fied 3+1/2 cell nio­bi­um cav­i­ties have been fab­ri­cat­ed and test­ed in Jlab. In this paper the new sta­tus of the SRF gun will be pre­sent­ed, and the lat­est re­sults of the beam ex­per­i­ments will be dis­cussed.