An ion guide for the production of a low energy ion beam of daughter products of alpha-emitters

作者：Tordoff B^*; Eronen T; Elomaa V V; Gulick S; Hager U; Karvonen P; Kessler T; Lee J; Moore I; Popov A; Rahaman S; Rinta Antila S; Sonoda T; Asysto J

来源：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms , 2006, 252(2): 347-353.

DOI：10.1016/j.nimb.2006.08.015

• gas cell
• Th-229
• electric field guidance
• ion guide

A new ion guide has been modeled and tested for the production of a low energy (approximate to 40 kV) ion beam of daughter products of alpha-emitting isotopes. The guide is designed to evacuate daughter recoils originating from the alpha-decay of a U-233 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 Th-229(+) (0.06%), Fr-221(+) (6%) and At-217(+) (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.

• 出版日期2006-11