Experimental methods in RIB target/ion source development and characterization

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We have developed off-line experimental techniques and apparatuses that permit direct measurement of effusive-flow delay-times and ionization efficiencies for nearly any chemically reactive element in high-temperature target/ion sources (TISs) commonly used for on-line radioactive ion beam (RIB) generation. The apparatuses include a hot Ta valve for effusive-flow delay-time measurements, a cooled molecular-injection system for determination of ionization efficiencies and a gas-flow measurement/control system for introducing very low, well-defined molecular flows into the TIS. Measurements are performed on a test-stand using molecular feed compounds containing stable complements of the radioactive nuclei of interest delivered to the TIS at flow-rates commensurate with ... continued below

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20 p.

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

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Description

We have developed off-line experimental techniques and apparatuses that permit direct measurement of effusive-flow delay-times and ionization efficiencies for nearly any chemically reactive element in high-temperature target/ion sources (TISs) commonly used for on-line radioactive ion beam (RIB) generation. The apparatuses include a hot Ta valve for effusive-flow delay-time measurements, a cooled molecular-injection system for determination of ionization efficiencies and a gas-flow measurement/control system for introducing very low, well-defined molecular flows into the TIS. Measurements are performed on a test-stand using molecular feed compounds containing stable complements of the radioactive nuclei of interest delivered to the TIS at flow-rates commensurate with on-line RIB generation. In this report, the general techniques are described and effusive-flow delay-times and ionization efficiency measurements are reported for fluorine in an electron-beam-plasma target/ion source (EBPTIS) developed for RIB generation and operated in both positive and negative ion extraction modes.

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20 p.

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OSTI as DE98001050

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

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  • Other: DE98001050
  • Report No.: ORNL/CP--94874
  • Report No.: CONF-970958--
  • Grant Number: AC05-96OR22464;AC05-76OR00033
  • Office of Scientific & Technical Information Report Number: 548860
  • Archival Resource Key: ark:/67531/metadc697304

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  • November 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Jan. 25, 2016, 12:49 p.m.

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Welton, R.F.; Alton, G.D.; Murray, S.N. & Cui, B. Experimental methods in RIB target/ion source development and characterization, article, November 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc697304/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.