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Production de noyaux exotiques par photofission,
Le projet ALTO : Premiers Résultats

Abstract : This Ph.D thesis has been carried out in the framework of ALTO project (Accélérateur Linéaire Auprès du Tandem d'Orsay), a project exploiting photofission as a production mode of neutron-rich nuclei for ISOL facilities. Our work deals with adaptation modes of the production environment represented by the target-ion source unit.
We undertook an exhaustive radioprotection study in order to design and define the kinds of shielding necessary to face intense flux of photons and neutrons generated in the production target. Monte Carlo simulations with FLUKA code allowed us to calculate the simultaneous transport of photons and the neutrons with an entire modelling of the very complicated geometrical structures. For the target-source unit and the critical points of beam loss, we propose an optimised shielding based mainly on the segmented structure.
We have studied the adequacy of a thick carbide uranium target to produce neutron-rich nuclei by photofission. In Particular, comparing the results of simulations with the experimental data, we have benchmarked FLUKA code for photofission with a 50 MeV electron beam.
Finally, we present our work on the design and development of a FEBIAD-type-ion-source prototype: IRENA ion source, designed for next generation facilities.This work shows how important radioprotection considerations are also involved in the design of the ion source.
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Contributor : Maher Cheikh Mhamed <>
Submitted on : Wednesday, March 21, 2007 - 5:08:37 PM
Last modification on : Wednesday, September 16, 2020 - 4:07:56 PM
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  • HAL Id : tel-00137745, version 1



Maher Cheikh Mhamed. Production de noyaux exotiques par photofission,
Le projet ALTO : Premiers Résultats. Physique Nucléaire Théorique [nucl-th]. Université d'Evry-Val d'Essonne, 2006. Français. ⟨tel-00137745⟩



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