Étude de l'injection axiale d'un faisceau d'ions lourds dans un cyclotron compact

Abstract : The aim of the OAE and OAI projects developed at GANIL is respectively to increase the ''medium'' heavy ion energies to get 45 MeV/A beams up to Xenon, and to increase the beam intensities. This study deals with the injection stage of the second of these operations. In this new design, the ECR source potential is 100 kV to avoid losses due to space charge. The inflector used for the injection in the cyclotron NC01 is a spiral type with two parameters. The equations of motion are straighforward to obtain and numerical simulation programs have been developed. It is then possible to compute the transfer matrix of this inflector and to study the behavior of the beam inside it. It is necessary to introduce an electrostatic quadrupole after the inflector exit to realize a good matching to the cyclotron with the condition of always staying inside the inflector acceptance. For these matching conditions, the inflector transmission is increased if one introduces a rotation of the inflector exit face. It is then possible to transfer beams with the required emittances and intensities in the OAI project. The knowledge of the inflector characteristics makes it possible to design an axial injection line to obtain a matched beam
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Stéphane Chel. Étude de l'injection axiale d'un faisceau d'ions lourds dans un cyclotron compact. Physique des accélérateurs [physics.acc-ph]. Université Paris 7, 1988. Français. ⟨tel-01697617⟩

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