Observation of annular electron beam transport in multi-TeraWatt laser-solid interactions

P.A. Norreys, J.S. Green, J.R. Davies, M. Tatarakis, E.L. Clark, F.N. Beg, A.E. Dangor, K.L. Lancaster, M.S. Wei, Matthew Zepf, K. Krushelnick

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


Electron energy transport experiments conducted on the Vulcan 100 TW laser facility with large area foil targets are described. For plastic targets it is shown, by the plasma expansion observed in shadowgrams taken after the interaction, that there is a transition between the collimated electron flow previously reported at the 10 TW power level to an annular electron flow pattern with a 20 degrees divergence angle for peak powers of 68 TW. Intermediate powers show that both the central collimated flow pattern and the surrounding annular-shaped heated region can co-exist. The measurements are consistent with the Davies rigid beam model for fast electron flow (Davies 2003 Phys. Rev. E 68 056404) and LSP modelling provides additional insight into the observed results.
Original languageEnglish
Pages (from-to)L11-L22
Number of pages12
JournalPlasma Physics and Controlled Fusion
Issue number2
Publication statusPublished - 01 Feb 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Nuclear and High Energy Physics

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