Fast electron transport patterns in intense laser-irradiated solids diagnosed by modeling measured multi-MeV proton beams

D.A. Maclellan, D.C. Carroll, R.J. Gray, N. Booth, Bruno Izquierdo, H.W. Powell, Graeme G. Scott, D. Neely, P. McKenna

Research output: Contribution to journalArticle

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Abstract

The measured spatial-intensity distribution of the beam of protons accelerated from the rear side of a solid target irradiated by an intense (>10 Wcm) laser pulse provides a diagnostic of the two-dimensional fast electron density profile at the target rear surface and thus the fast electron beam transport pattern within the target. An analytical model is developed, accounting for rear-surface fast electron sheath dynamics, ionization and projection of the resulting beam of protons. The sensitivity of the spatial-intensity distribution of the proton beam to the fast electron density distribution is investigated. An annular fast electron beam transport pattern with filamentary structure is inferred for the case of a thick diamond target irradiated at a peak laser intensity of 6 × 10 Wcm.
Original languageEnglish
Pages (from-to)475-480
Number of pages6
JournalLaser and Particle Beams
Volume31
Issue number3
DOIs
Publication statusPublished - 1 Sep 2013

Keywords

  • laser-driven ion acceleration
  • fast-electron beams
  • fast-electron transport in solids

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