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
Abstract
A new ion guide has been modeled and tested for the production of a low energy (≈ 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 233U 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 229Th+ (0.06%), 221Fr+ (6%), and 217At+ (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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