Selection and design of ion sources for use at the Holifield Radioactive Ion Beam Facility

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The Holifield Radioactive Ion beam Facility now under construction at the Oak Ridge National Laboratory will use the 25-MV tandem accelerator for the acceleration of radioactive ion beams to energies appropriate for research in nuclear physics; negative ion beams are, therefore, required for injection into the tandem accelerator. Because charge exchange is an efficient means for converting initially positive ion beams to negative ion beams, both positive and negative ion sources are viable options for use at the facility. The choice of the type of ion source will depend on the overall efficiency for generating the radioactive species of interest. ... continued below

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27 p.

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Alton, G.D.; Haynes, D.L.; Mills, G.D. & Olsen, D.K. December 31, 1993.

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Description

The Holifield Radioactive Ion beam Facility now under construction at the Oak Ridge National Laboratory will use the 25-MV tandem accelerator for the acceleration of radioactive ion beams to energies appropriate for research in nuclear physics; negative ion beams are, therefore, required for injection into the tandem accelerator. Because charge exchange is an efficient means for converting initially positive ion beams to negative ion beams, both positive and negative ion sources are viable options for use at the facility. The choice of the type of ion source will depend on the overall efficiency for generating the radioactive species of interest. Although direct-extraction negative ion sources are clearly desirable, the ion formation efficiencies are often too low for practical consideration; for this situation, positive ion sources, in combination with charge exchange, are the logical choice. The high-temperature version of the CERN-ISOLDE positive ion source has been selected and a modified version of the source designed and fabricated for initial use at the facility because of its low emittance, relatively high ionization efficiencies and species versatility, and because it has been engineered for remote installation, removal and servicing as required for safe handling in a high-radiation-level ISOL facility. The source will be primarily used to generate ion beams from elements with intermediate to low electron affinities. Prototype plasma-sputter negative ion sources and negative surface-ionization sources are under design consideration for generating radioactive ion beams from high-electron-affinity elements. The design features of these sources and expected efficiencies and beam qualities (emittances) will be described in this report.

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27 p.

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INIS; OSTI as DE96010632

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  • 5. international conference on ion sources, Beijing (China), 31 Aug - 4 Sep 1993

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  • Other: DE96010632
  • Report No.: CONF-9308136--7
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 239334
  • Archival Resource Key: ark:/67531/metadc665544

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  • December 31, 1993

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 22, 2016, 4:30 p.m.

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Alton, G.D.; Haynes, D.L.; Mills, G.D. & Olsen, D.K. Selection and design of ion sources for use at the Holifield Radioactive Ion Beam Facility, article, December 31, 1993; Tennessee. (digital.library.unt.edu/ark:/67531/metadc665544/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.