Effect of laser intensity on fast-electron-beam divergence in solid-density plasmas

J.S. Green, V.M. Ovchinnikov, R.G. Evans, K.U. Akli, H. Azechi, F.N. Beg, C. Bellei, R.R. Freeman, H. Habara, R. Heathcote, M.H. Key, J.A. King, K.L. Lancaster, N.C. Lopes, T. Ma, A.J. MacKinnon, K. Markey, A. McPhee, Z. Najmudin, P. NilsonR. Onofrei, R. Stephens, K. Takeda, K.A. Tanaka, W. Theobald, T. Tanimoto, J. Waugh, L. Van Woerkom, N.C. Woolsey, Matthew Zepf, J.R. Davies, P.A. Norreys

Research output: Contribution to journalArticlepeer-review

169 Citations (Scopus)


Metal foil targets were irradiated with 1 mu m wavelength (lambda) laser pulses of 5 ps duration and focused intensities (I) of up to 4x10(19) W cm(-2), giving values of both I lambda(2) and pulse duration comparable to those required for fast ignition inertial fusion. The divergence of the electrons accelerated into the target was determined from spatially resolved measurements of x-ray K-alpha emission and from transverse probing of the plasma formed on the back of the foils. Comparison of the divergence with other published data shows that it increases with I lambda(2) and is independent of pulse duration. Two-dimensional particle-in-cell simulations reproduce these results, indicating that it is a fundamental property of the laser-plasma interaction.
Original languageEnglish
Article number015003
JournalPhysical Review Letters
Issue number1
Publication statusPublished - 11 Jan 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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