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International Workshop on ECR Sources 14, Geneva : Suisse (1999)
The $1^{+}\to n^{+}$ charge breeding method for the production of radioactive and stable continuous/pulsed multi-charged ion beams
N. Chauvin1, J.F. Bruandet1, J.L. Bouly1, J.C. Curdy1, R. Geller1, T. Lamy1, P. Sole1, P. Sortais1, J.L. Vieux-Rochaz1

The principle of the 1+ -> n+ charge breeding method by injecting a mono-charged ion beam in an Electron Cyclotron Resonance Ion Source is recalled. Some 1+ ->n+ breeding efficiencies in continuous mode are given, like 9% for Ar1+ ->Ar8+ and 5% for Rb1+->Rb15+. The global capture efficiency is deduced from the whole charge state distribution spectrum. The ECRIT (ECR Ion Trap) mode that allows to produce a pulsed multi-charged beam is explained. The n+ ions are extracted in a 20 ms pulse. The breeding-bunching efficiencies are measured for Rb1+->Rb15+ (2.2%) and Pb1+->Pb22+ (1.3 %). Ion trapping time in the ECRIT plasma is evaluated to some hundreds of ms. A new application of the 1+->n+ method is developed: the production of multi-charged natural metallic ions. First experiments have been done on uranium: a 500 nA continuous current of U26+ has been measured. Finally, the future developments on the 1+->n+ experiment are discussed. A description of a 1+ ->n+ dedicated high performance ECRIS named PHOENIX (Production Hautement Optimisee a Electrons de Noyaux Ionises et de rayons X) will be presented.
1 :  LPSC - Laboratoire de Physique Subatomique et de Cosmologie
Physique/Physique/Instrumentations et Détecteurs
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