Ionization efficiency studies for xenon ions with thesuperconducting ECR ion source VENUS

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Ionization efficiency studies for high charge state xenon ions using a calibrated gas leak are presented. A 75% enriched {sup 129}Xe gas leak with a gas flow equivalent to 5.11p{mu}A was used in all the measurements. The experiments were performed at the VENUS (Versatile ECR ion source for Nuclear Science) ion source for 18 GHz, 28 GHz and double frequency operation. Overall, total ionization efficiencies close to 100% and ionization efficiencies into a single charge state up to 22% were measured. The influence of the biased disk on the ionization efficiency was studied and the results were somewhat surprising. When ... continued below

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Leitner, Daniela; Lyneis, Claude M.; Todd, DamonS. & Tarvainen,Olli June 5, 2007.

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Ionization efficiency studies for high charge state xenon ions using a calibrated gas leak are presented. A 75% enriched {sup 129}Xe gas leak with a gas flow equivalent to 5.11p{mu}A was used in all the measurements. The experiments were performed at the VENUS (Versatile ECR ion source for Nuclear Science) ion source for 18 GHz, 28 GHz and double frequency operation. Overall, total ionization efficiencies close to 100% and ionization efficiencies into a single charge state up to 22% were measured. The influence of the biased disk on the ionization efficiency was studied and the results were somewhat surprising. When the biased disk was removed from the plasma chamber, the ionization efficiency was dramatically reduced for single frequency operation. However, using double frequency heating the ionization efficiencies achieved without the biased disk almost matched the ionization efficiencies achieved with the biased probe. In addition, we have studied the influence of the support gas on the charge state distribution of the xenon ions. Either pure oxygen or a mixture of oxygen and helium were used as support gases. The addition of a small amount of helium can increase the ionization efficiency into a single charge state by narrowing the charge state distribution. Furthermore by varying the helium flow the most efficient charge state can be shifted over a wide range without compromising the ionization efficiency. This is not possible using only oxygen as support gas. Results from these studies are presented and discussed.

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  • Journal Name: Nuclear Instruments and Methods B; Journal Volume: 264; Journal Issue: 1; Related Information: Journal Publication Date: 11/2007

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  • Report No.: LBNL--63588
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 925598
  • Archival Resource Key: ark:/67531/metadc897390

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • June 5, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 30, 2016, 1:56 p.m.

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Leitner, Daniela; Lyneis, Claude M.; Todd, DamonS. & Tarvainen,Olli. Ionization efficiency studies for xenon ions with thesuperconducting ECR ion source VENUS, article, June 5, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc897390/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.