Two frequency operation of the Argonne ECR ion source.

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Performance of the Argonne ECR ion source has been improved through the use of two frequency heating--the primary frequency of 14 GHz from a klystron and the second frequency from a traveling wave tube amplifier (TWTA) with a tunable range of 11.0--13.0 GHz. Source output as well as stability have been improved with a shift to higher charge states observed. A larger separation between the two operating frequencies has demonstrated improved beam production as well as greater stability. The addition of 60 watts at 10.85 GHz produced a 69% increase in O{sup 7+} beam production, whereas a similar increase to ... continued below

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Vondrasek, R. C.; Scott, R. H. & Pardo, R. C. August 1, 2002.

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Performance of the Argonne ECR ion source has been improved through the use of two frequency heating--the primary frequency of 14 GHz from a klystron and the second frequency from a traveling wave tube amplifier (TWTA) with a tunable range of 11.0--13.0 GHz. Source output as well as stability have been improved with a shift to higher charge states observed. A larger separation between the two operating frequencies has demonstrated improved beam production as well as greater stability. The addition of 60 watts at 10.85 GHz produced a 69% increase in O{sup 7+} beam production, whereas a similar increase to the 14 GHz RF power alone, without the addition of a second frequency, produced only a 20% increase in beam production. Use of a second frequency has increased the intensity of the medium charge states by 50-100% ({sup 56}Fe{sup 13+}: 10.6 {yields} 17.4 e{mu}A; {sup 86}Kr{sup 15+}: 65 {yields} 120 e{mu}A) and the higher charge states a factor of 2 to 5 ({sup 56}Fe{sup 17+}: 1.15 {yields} 6.40 e{mu}A; {sup 238}U{sup 37+}: 2.0 {yields} 3.0 e{mu}A). Operational modes and results will be presented.

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  • 15th International Workshop on ECR Ion Sources (SCRIS), University of Jyvaskyla (FI), 06/12/2002--06/14/2002

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  • Report No.: ANL/PHY/CP-108362
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 799796
  • Archival Resource Key: ark:/67531/metadc741122

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  • August 1, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • March 24, 2016, 3:14 p.m.

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Vondrasek, R. C.; Scott, R. H. & Pardo, R. C. Two frequency operation of the Argonne ECR ion source., article, August 1, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc741122/: accessed August 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.