• S. Hesselbach, G.A. Moortgat-Pick
  Durham University, Durham
• I.R. Bailey, L.J. Jenner
  Cockcroft Institute, Warrington, Cheshire
• J.-L. Fernandez-Hernando
  STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
• S. Riemann, A. Schälicke, A. Ushakov
  DESY Zeuthen, Zeuthen
• J. Rochford
  STFC/RAL/ASTeC, Chilton, Didcot, Oxon
• L. Zang
  The University of Liverpool, Liverpool

Energy deposition in the conversion targets of positron sources for future linear colliders will lead to thermal shock waves which could limit the targets' lifetimes. For the International Linear Collider baseline source, we have studied the energy deposition in a target taking the higher harmonics of the undulator radiation fully into account and applying hydrodynamical models for the resulting heat flow to determine the thermal stress in the target and to assess its survivability.

• M. Krasilnikov, G. Asova, J.W. Bähr, C.H. Boulware, U. Gensch, H.-J. Grabosch, L. Hakobyan, M. Hänel, Ye. Ivanisenko, M.A. Khojoyan, M. Otevrel, B. Petrosyan, S. Riemann, S. Rimjaem, J. Rönsch-Schulenburg, A. Shapovalov, R. Spesyvtsev, L. Staykov, F. Stephan, G. Vashchenko
  DESY Zeuthen, Zeuthen
• K. Flöttmann, S. Lederer, S. Schreiber
  DESY, Hamburg
• G. Klemz, I. Will
  MBI, Berlin
• D. Richter
  BESSY GmbH, Berlin

The Photo Injector Test facility at DESY, Zeuthen site, (PITZ*) aims to develop and optimize electron sources for frontiers linac based FELs such as FLASH and the European XFEL. A new laser system has been commissioned at PITZ in autumn 2008. It is capable to deliver laser pulses with challenging temporal shape: a flat-top profile with ~20 ps FWHM and rise and fall times of ≤2 ps. This laser system, being a significant step towards the European XFEL photo injector specifications, has been used in a 1.6-cell L-band rf gun with ~60MV/m electric field at the cathode to produce high brightness electron beams. A major part of the PITZ measurement program is the optimizing of the transverse phase space. Recent electron beam measurements at PITZ will be presented.

*for the PITZ team