COMPTON SCATTERING AS A TOOL FOR ANTIPROTON BEAM MAPPING

The goal of the AEGIS project at CERN is to create ultra-cold antihydrogen in order to perform precise measurments on the direction and magnitude of the gravitational force felt by antimatter. In order to provide the best results it is necessary to create as much antihydrogen as possible. The method of production chosen by AEGIS is a charge exchange process between excited positronium and ultra-cold antiprotons. In order to cool the antiprotons to well below mK temperatures, the AEGIS collaboration is attempting to sympathetically cool the antiprotons using laser cooled C2 anions. In order to ensure maximum efficiency of this process it is necessary to perform precise measurments on the position and energy of the antiproton beam we are attempting to cool. Unfortunately, it is almost impossible to perform these measurments using traditional methods of beam measurments, such as inserting a thin wire into the beam axis, since the antiprotons will annihilate upon contact with regular matter. It is for this reason that it is necessary to use non-intrusive methods. One of the proposed methods is using Compton Scattered photons to obtain an energy spectrum and position map of the beam. In this paper I will discuss the theory behind this idea and the way it might be implemented within the AEGIS experiment.