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Title: Selection and design of ion sources for use at the Holifield radioactive ion beam facility

Abstract

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 willmore » 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.« less

Authors:
; ; ;  [1]
  1. Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6368 (United States)
Publication Date:
OSTI Identifier:
7310416
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments; (United States)
Additional Journal Information:
Journal Volume: 65:6; Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ION SOURCES; DESIGN; RADIOISOTOPES; CATIONS; EFFICIENCY; ION BEAM INJECTION; TANDEM ELECTROSTATIC ACCELERATORS; ACCELERATORS; BEAM INJECTION; CHARGED PARTICLES; ELECTROSTATIC ACCELERATORS; IONS; ISOTOPES; 430301* - Particle Accelerators- Ion Sources

Citation Formats

Alton, G D, Haynes, D L, Mills, G D, and Olsen, D K. Selection and design of ion sources for use at the Holifield radioactive ion beam facility. United States: N. p., 1994. Web. doi:10.1063/1.1144805.
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. United States. https://doi.org/10.1063/1.1144805
Alton, G D, Haynes, D L, Mills, G D, and Olsen, D K. 1994. "Selection and design of ion sources for use at the Holifield radioactive ion beam facility". United States. https://doi.org/10.1063/1.1144805.
@article{osti_7310416,
title = {Selection and design of ion sources for use at the Holifield radioactive ion beam facility},
author = {Alton, G D and Haynes, D L and Mills, G D and Olsen, D K},
abstractNote = {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.},
doi = {10.1063/1.1144805},
url = {https://www.osti.gov/biblio/7310416}, journal = {Review of Scientific Instruments; (United States)},
issn = {0034-6748},
number = ,
volume = 65:6,
place = {United States},
year = {Wed Jun 01 00:00:00 EDT 1994},
month = {Wed Jun 01 00:00:00 EDT 1994}
}