An Ion Guide for the Production of a Low Energy Ion Beam of Daughter Products of $α$-Emitters

B. Tordoff; T. Eronen; V. V. Elomaa; S. Gulick; U. Hager; P. Karvonen; T. Kessler; J. Lee; I. Moore; A. Popov; S. Rahaman; S. Rinta-Antila; T. Sonoda; J. Aysto

doi:10.1016/j.nimb.2006.08.015

arXiv · nucl-ex/0605027

An Ion Guide for the Production of a Low Energy Ion Beam of Daughter Products of $α$-Emitters

B. Tordoff·T. Eronen·V. V. Elomaa·S. Gulick·U. Hager·P. Karvonen·T. Kessler·J. Lee·I. Moore·A. Popov·S. Rahaman·S. Rinta-Antila·T. Sonoda·J. Aysto

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Abstract

A new ion guide has been modeled and tested for the production of a low energy ($\approx$ 40 kV) ion beam of daughter products of alpha-emitting isotopes. The guide is designed to evacuate daughter recoils originating from the $α$-decay of a $^{233}$U source. The source is electroplated onto stainless steel strips and mounted along the inner walls of an ion guide chamber. A combination of electric fields and helium gas flow transport the ions through an exit hole for injection into a mass separator. Ion guide efficiencies for the extraction of $^{229}$Th$^{+}$ (0.06%), $^{221}$Fr$^{+}$ (6%), and $^{217}$At$^{+}$ (6%) beams have been measured. A detailed study of the electric field and gas flow influence on the ion guide efficiency is described for two differing electric field configurations.

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B. Tordoff, T. Eronen, V. V. Elomaa, S. Gulick, U. Hager, P. Karvonen, T. Kessler, J. Lee, I. Moore, A. Popov, S. Rahaman, S. Rinta-Antila, T. Sonoda, J. Aysto. 2006-05-22. An Ion Guide for the Production of a Low Energy Ion Beam of Daughter Products of $α$-Emitters. https://doi.org/10.1016/j.nimb.2006.08.015

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