Recherche et développement concernant la production d'ions radioactifs dans le cadre de SPIRAL

Abstract : This thesis is related to the R&D for the production of radioactive ion beams by the ISOL method for SPIRAL at GANIL. Two studies concerning improvements to the performance of SPIRAL target-source system have been made, using a statistical approach to the atoms-to-ions transformation.
The first study concerns the transformation time between the production of the radioactive atoms of $^{35}$Ar inside a target and the extraction of the radioactive ions from the source with the TARGISOL set-up (target + ECR source). The goal was to determine the diffusion coefficients of the Ar for the carbon target. The results were presented and illustrate the difficulty of this work.
The second study is the application of the statistical approach to the surface ionization source. It allowed one to define and to build a new MonoNaKe set-up for the production of 1+ radioactive alkaline ions. Radioactive ions of $^{37,47}$K, $^{25,26,27,28,30}$Na, $^{8,9}$Li and $^{28,29,30,31}$Al were produced.
For the production of the multicharged radioactive alkali ions, the MonoNaKe target/ion-source system was coupled to the ECR source of SPIRAL 1 without a mass separator (1+/N+ direct method). A first radioactive ion beam of $^{47}$K$^{5+}$ was extracted at the SIRa test bench.
A surface ionization test source based on the same technical characteristics of MonoNaKe has been built. The goal of this system will be to define a prototype of source adapted to the constraints of SPIRAL 2 (ionization efficiency and lifetime).
Document type :
Theses
Nuclear Theory. Université de Caen, 2007. French


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Submitted on : Thursday, February 14, 2008 - 3:59:49 PM
Last modification on : Thursday, April 23, 2015 - 1:58:05 PM

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Cyrille Eléon. Recherche et développement concernant la production d'ions radioactifs dans le cadre de SPIRAL. Nuclear Theory. Université de Caen, 2007. French. <tel-00256016>

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