Absolute Measurement of Electron Cloud Density in a Positively-Charged Particle Beam

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Clouds of stray electrons are ubiquitous in particle accelerators and frequently limit the performance of storage rings. Earlier measurements of electron energy distribution and flux to the walls provided only a relative electron cloud density. We have measured electron accumulation using ions expelled by the beam. The ion energy distribution maps the depressed beam potential and gives the dynamic cloud density. Clearing electrode current reveals the static background cloud density, allowing the first absolute measurement of the time-dependent electron cloud density during the beam pulse.

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Covo, M K; Molvik, A W; Friedman, A; Vay, J; Seidl, P A; Logan, B G et al. May 18, 2006.

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Clouds of stray electrons are ubiquitous in particle accelerators and frequently limit the performance of storage rings. Earlier measurements of electron energy distribution and flux to the walls provided only a relative electron cloud density. We have measured electron accumulation using ions expelled by the beam. The ion energy distribution maps the depressed beam potential and gives the dynamic cloud density. Clearing electrode current reveals the static background cloud density, allowing the first absolute measurement of the time-dependent electron cloud density during the beam pulse.

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PDF-file: 13 pages; size: 0.3 Mbytes

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  • Journal Name: Physical Review Letters, vol. 97, no. 5, July 31, 2006, pp. 054801; Journal Volume: 97; Journal Issue: 5

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  • Report No.: UCRL-JRNL-221485
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 900451
  • Archival Resource Key: ark:/67531/metadc890630

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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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  • May 18, 2006

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 22, 2016, 2:22 p.m.

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Covo, M K; Molvik, A W; Friedman, A; Vay, J; Seidl, P A; Logan, B G et al. Absolute Measurement of Electron Cloud Density in a Positively-Charged Particle Beam, article, May 18, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc890630/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.