Kinematically complete experiments for double ionization of He atoms: Development of a laser-pulsed photo-emission source C.D. Schroeter, A. Dorn, R. Moshammer and J. Ullrich Fakultaet fuer Physik, Universitaet Freiburg, D-79104 Freiburg, Germany First kinematically complete experiments for the double ionization of He atoms by electron impact have been performed. For systematic investigation of this elementary process, the apparatus has been improved substantially. A three-stage supersonic He jet target has been built and a laser-pulsed photo-emission source is under construction. Both developments will result in a reduced data-taking time and improved electron and recoil-ion momentum resolution.