Numerical Study of Coulomb Scattering Effects on Electron Beamfrom a Nano-Tip

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Nano-tips with high acceleration gradient around the emission surface have been proposed to generate high brightness beams. However, due to the small size of the tip, the charge density near the tip is very high even for a small number of electrons. The stochastic Coulomb scattering near the tip can degrade the beam quality and cause extra emittance growth and energy spread. In the paper, we present a numerical study of these effects using a direct relativistic N-body model. We found that emittance growth and energy spread, due to Coulomb scattering, can be significantly enhanced with respect to mean-field space-charge ... continued below

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Qiang, Ji; Corlett, John N.; Lidia, Steven M.; Padmore, HowardA.; Wan, Weishi; Zholent, Andrew A. et al. June 25, 2007.

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Nano-tips with high acceleration gradient around the emission surface have been proposed to generate high brightness beams. However, due to the small size of the tip, the charge density near the tip is very high even for a small number of electrons. The stochastic Coulomb scattering near the tip can degrade the beam quality and cause extra emittance growth and energy spread. In the paper, we present a numerical study of these effects using a direct relativistic N-body model. We found that emittance growth and energy spread, due to Coulomb scattering, can be significantly enhanced with respect to mean-field space-charge calculations.

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  • Particle Accelerator Conference 07, Albuquerque,New Mexico, June 25-29, 2007

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  • Report No.: LBNL--62090
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 932681
  • Archival Resource Key: ark:/67531/metadc896500

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Office of Scientific & Technical Information Technical Reports

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  • June 25, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 31, 2016, 4:12 p.m.

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Qiang, Ji; Corlett, John N.; Lidia, Steven M.; Padmore, HowardA.; Wan, Weishi; Zholent, Andrew A. et al. Numerical Study of Coulomb Scattering Effects on Electron Beamfrom a Nano-Tip, article, June 25, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc896500/: accessed April 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.