An electron packet is described by a 6-dimensional phase space. The two components in the longitudinal direction (in the direction of flight) describe the length and momentum uncertainty of the electron packet. Shortly after the generation of the electron beam in the thermionic source of the S-DALINAC, a vertical diagnostic beamline provides the possibility to measure the length of the electron bunches with 250 keV kinetic energy. Up to this section there are further beam guiding elements which can influence the electron bunch length.

Within the scope of this bachelor thesis, systematic investigations of the dependence of different settings of the beam guiding on the electron bunch length shall be performed. The optimal settings for the acceleration in the superconducting injector will be verified.