Prototype negative ion sources for RIB generation

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Radioactive ion beams (RIBs) of {sup 17}F and {sup 18}F are of interest for investigation of astrophysical phenomena such as the hot CNO cycle and the rp stellar nuclear synthesis processes. In order to generate useful beam intensities of atomic F{sup {minus}}, the species must be efficiently and expediently released from the target material, thermally dissociated from fluoride release products during transport to the ionization chamber of the ion source, and efficiently ionized in the source upon arrival. The authors have conceived and evaluated two prototype negative ion sources for potential use for RIB generation: (1) a direct extraction source ... continued below

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27 p.

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Alton, G.D.; Murray, S.N.; Welton, R.F.; Williams, C. & Cui, B. December 1, 1997.

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Description

Radioactive ion beams (RIBs) of {sup 17}F and {sup 18}F are of interest for investigation of astrophysical phenomena such as the hot CNO cycle and the rp stellar nuclear synthesis processes. In order to generate useful beam intensities of atomic F{sup {minus}}, the species must be efficiently and expediently released from the target material, thermally dissociated from fluoride release products during transport to the ionization chamber of the ion source, and efficiently ionized in the source upon arrival. The authors have conceived and evaluated two prototype negative ion sources for potential use for RIB generation: (1) a direct extraction source and (2) a kinetic ejection source. Both sources utilize Cs vapor to enhance F{sup {minus}} formation. The mechanical design features, operational parameters, ionization efficiencies for forming atomic F{sup {minus}} and delay times for transport of F and fluoride compounds for the respective sources are presented. The efficiency {eta} for formation and extraction of F{sup {minus}} for the direct extraction negative ion source is found to be {eta} {approximately} 1.0% while the characteristic delay time {tau} for transport of F and fluorides through the source is typically, {eta} {approximately} 120s; the analogous efficiencies and delay times for the kinetic ejection negative ion source are, respectively: {eta} = {approximately}3.2% and {tau} = {approximately}70s.

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27 p.

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INIS; OSTI as DE98000684

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  • 7. international conference on ion sources, Taormina (Italy), 7-13 Sep 1997

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  • Other: DE98000684
  • Report No.: ORNL/CP--95071
  • Report No.: CONF-970958--
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 554838
  • Archival Resource Key: ark:/67531/metadc690012

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  • December 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Jan. 22, 2016, 8:34 p.m.

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Alton, G.D.; Murray, S.N.; Welton, R.F.; Williams, C. & Cui, B. Prototype negative ion sources for RIB generation, article, December 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc690012/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.