An online monitor system for high energy photon beams

An apparatus and corresponding software for optimization of photon beams during the beam development phase and for monitoring during experiments is described. The system consists of a scintillator positioned in the beam, an image intensifier and a highly sensitive CCD camera. The CCD camera is read out and controlled by a PC via a frame-grabber card. Software control of the camera and a graphical interface have been developed. The intensity as well as the position of the beam can be constantly supervised online.