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Laser driven MeV proton beam focussing by auto-charged electrostatic lens configuration

Research output: Contribution to journalJournal article

Published
  • S. Kar
  • K. Markey
  • P. T. Simpson
  • C. Bellei
  • J. S. Green
  • S. R. Nagel
  • S. Kneip
  • D. C. Carroll
  • B. Dromey
  • L. Willingale
  • E. L. Clark
  • P. McKenna
  • Z. Najmudin
  • K. Krushelnick
  • P. Norreys
  • R. J. Clarke
  • D. Neely
  • M. Borghesi
  • A. Schiavi
  • M. Zepf
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<mark>Journal publication date</mark>24/06/2008
<mark>Journal</mark>AIP Conference Proceedings
Volume1024
Number of pages10
Pages (from-to)173-182
Publication statusPublished
Original languageEnglish
Event1st International Symposium on Laser-Driven Relativistic Plasmas Applied for Science, Industry, and Medicine - Kyoto, Japan
Duration: 17/09/200720/09/2007

Conference

Conference1st International Symposium on Laser-Driven Relativistic Plasmas Applied for Science, Industry, and Medicine
CountryJapan
CityKyoto
Period17/09/0720/09/07

Abstract

Significant reduction of inherent large divergence of the laser driven MeV proton beams is achieved by strong (of the order of 10(9) V/m) electrostatic focussing field generated in the confined region of a suitably shaped structure attached to the proton generating foil. The scheme exploits the positively charging of the target following an intense laser interaction. Reduction in the proton beam divergence, and commensurate increase in proton flux is observed while preserving the beam laminarity. The underlying mechanism has been established by the help of particle tracing simulations. Dynamic focussing power of the lens, mainly due to the target discharging, can also be exploited in order to bring up the desired chromaticity of the lens for the proton beams of broad energy range.