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Etude par la simulation et l'expérimentation de la production d'ions métalliques Calcium à l'aide d'une source d'ions du type Résonance Cyclotronique Electronique

Abstract : In the framwork of the SPIRAL2 project, the Electron Cyclotron Resonance Ion Source PHOENIX V3 (upgrade of the previous source PHOENIX V2) has been developed to improve the production of highly charged ions with A/Q=3. The ion source mainly aims at the production of metal ion beams. For this, condensable atoms are sublimated into oven before being injected into the ion source. During the production of such ion beams, the major part of atoms travel towards the plasma chamber wall and remains there. Those losses lead to low global ionization efficiency (of the order of ten percent).An hybrid code PIC (Particle In Cells) was developed to study the dynamic of charged particles and to reproduce the experimental A/Q spectrum produced by the PHOENIX V3 ion source. The simulation focuses on the propagation of ions in 3D. Using several adjustable parameters, the simulation outcomes fit the charge state distribution at the exit of the ion source. This code has provided encouraging results.In parallel with the simulation study of particle dynamic in the plasma, a series of simulations have been run to reproduce the operation of an oven leading to the emission of metallic atoms. The outcomes of the simulations allow analysis of the angular distribution of the particles leaving the hot crucible. The angular distributions provided by the simulations are compared with those obtained through experimental measurements.An experimental study was also initiated to reduce the sticking time of the metal atoms on the plasma chamber. For this, a thermoregulated cylinder has been designed and realised to promote the re-evaporation of fixed paricles. It is thus possible to increase the global ionization efficiency by a factor 2 at least and to study the variation of the efficiency as a fonction of the cylinder temperature.
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Alexandre Leduc. Etude par la simulation et l'expérimentation de la production d'ions métalliques Calcium à l'aide d'une source d'ions du type Résonance Cyclotronique Electronique. Physique [physics]. Normandie Université, 2019. Français. ⟨NNT : 2019NORMC239⟩. ⟨tel-02520530v2⟩

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