Beam-Profile Monitoring and Analysis by Television

The usefulness of the pepper-pot emittance device for performing quantitative beam diagnostics has been extended to real time by employing a video analyzer to analyze the pepper-pot scene as viewed by a television system. The video analyzer produces a display of the intensity as a function of position and directly recognizable angular information. A television monitor displaying this information is located near the beam controls. The pepper-pot scenes, complete with beam data, can be stored on video tape for later analysis. Means are also provided for generating a three-dimensional plot of the pepper-pot scene on an x-y plotter. Time dependence of the beam emittance is obtained by placing an image intensifier ahead of the television camera.