On the investigation of fast electron beam filamentation in laser-irradiated solid targets using multi-MeV proton emission

M. N. Quinn, D. C. Carroll, X. H. Yuan, M. Borghesi, R. J. Clarke, R. G. Evans, J. Fuchs, P. Gallegos, L. Lancia, K. Quinn, A. P. L. Robinson, L. Romagnani, G. Sarri, C. Spindloe, P. A. Wilson, D. Neely, P. McKenna

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11 Citations (Scopus)

Abstract

The transverse filamentation of beams of fast electrons transported in solid targets irradiated by ultraintense (5 x 10(20) W cm(-2)), picosecond laser pulses is investigated experimentally. Filamentation is diagnosed by measuring the uniformity of a beam of multi-MeV protons accelerated by the sheath field formed by the arrival of the fast electrons at the rear of the target, and is investigated for metallic and insulator targets ranging in thickness from 50 to 1200 mu m. By developing an analytical model, the effects of lateral expansion of electron beam filaments in the sheath during the proton acceleration process is shown to account for measured increases in proton beam nonuniformity with target thickness for the insulating targets.

Original languageEnglish
Article number124012
Pages (from-to)-
Number of pages8
JournalPlasma Physics and Controlled Fusion
Volume53
Issue number12
DOIs
Publication statusPublished - Dec 2011

Keywords

  • plasma physics
  • electron beam filamentation
  • multi-MeV proton emission

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