Abstract
In this paper we investigate the profile of the 18MeV proton beam from the IBA 18/9 cyclotron at the Hôpitaux Universitaires de Genève. The profile of the beam has a large impact on the isotope yields obtained from liquid or solid targets. The beam shape may be controlled by a beam-line, comprising beam focusing elements and diagnostic tools. To design the beam-line it is vital to have a good knowledge of the beam’s transverse emittance as it exits the cyclotron. We have installed havar foils at various positions in the beam path, and analysed the irradiated foils by autoradiography. These measurements show that the beam shape varies considerably from one exit port to another, and have allowed us to estimate the beam’s emittance, divergence, and the position of its focii.
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