Beam Interaction Measurements with a Retarding Field Analyzer in a High-Current High-Vacuum Positively-Charged Particle Accelerator

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A Retarding Field Analyzer (RFA) was inserted in a drift region of a magnetic transport section of the high-current experiment (HCX) that is at high-vacuum to measure ions and electrons resulting from beam interaction with background gas and walls. The ions are expelled during the beam by the space-charge potential and the electrons are expelled mainly at the end of the beam, when the beam potential decays. The ion energy distribution shows the beam potential of {approx} 2100 V and the beam-background gas total cross-section of 1.6x10{sup -20} m{sup 2}. The electron energy distribution reveals that the expelled electrons are ... continued below

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Covo, M. K.; Molvik, A. W.; Friedman, A.; Barnard, J. J.; Seidl, P. A.; Logan, B. G. et al. July 11, 2006.

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A Retarding Field Analyzer (RFA) was inserted in a drift region of a magnetic transport section of the high-current experiment (HCX) that is at high-vacuum to measure ions and electrons resulting from beam interaction with background gas and walls. The ions are expelled during the beam by the space-charge potential and the electrons are expelled mainly at the end of the beam, when the beam potential decays. The ion energy distribution shows the beam potential of {approx} 2100 V and the beam-background gas total cross-section of 1.6x10{sup -20} m{sup 2}. The electron energy distribution reveals that the expelled electrons are mainly desorbed from the walls and gain {approx} 22 eV from the beam potential decaying with time before entering the RFA. Details of the RFA design and of the measured energy distributions are presented and discussed.

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PDF-file: 24 pages; size: 1 Mbytes

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  • Journal Name: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 577, no. 1-2, July 1, 2007, pp. 139-145; Journal Volume: 577; Journal Issue: 1-2

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  • Report No.: UCRL-JRNL-222732
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 909638
  • Archival Resource Key: ark:/67531/metadc889716

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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.

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  • July 11, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 6, 2016, 7:23 p.m.

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Covo, M. K.; Molvik, A. W.; Friedman, A.; Barnard, J. J.; Seidl, P. A.; Logan, B. G. et al. Beam Interaction Measurements with a Retarding Field Analyzer in a High-Current High-Vacuum Positively-Charged Particle Accelerator, article, July 11, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc889716/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.