After the generation of the laser light, a dipole deflects the highly energetic electron beam of the "Free Electron Laser Hamburg" into a dump. To control the position, dimensions and profile of the electron beam and to avoid contact with adjacent components, causing a total breakdown of the linac, a detector is developed. Light is emitted due to the electrons hitting a luminescent screen, and is then reflected by a mirror, located in 2 m distance from the screen, and passes through a vacuum window to a CCD camera. An experimental setup is currently built, representing quite closely the terms of installation at FLASH II. In this setup the ceramics Al2O3 and Chromox will be examined as screen materials.