Contribution to the Study of Isotopic Contamination with a Double Magnetic Deflection Isotope Separator
The analysis of the isotopic composition of the ion beam which enters the collector of an electromagnetic separator gives an accurate indication of the nature of contamination in these instruments. We used for this study the second magnetic stage of our isotope separator.
Although the contribution of fast neutral particles produced by change of charge is important, it can easily be eliminated and does not constitute a limiting factor to isotopic purity. This limit is due to scattered ions and, for a small part, to ions that were slowed down or that did not receive the full accelerating voltage.
The contribution of neutrals is obtained from the difference between the isotopic composition of a deposit made on the first stage collector and that of the corresponding ion beam analysed by the second stage.
The experiments were carried out on Sr, Yb, and U. The results confirm the preferential contamination by neighbouring isotopes of heavier mass. The origin of this asymmetry is discussed. The consequences of these various processes on the limiting performances of magnetic cascades are studied.
KeywordsIsotopic Composition Enrichment Factor Magnetic Stage Ionic Contamination Intermediate Diaphragm
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