Effects of Preplasma Scale Length and Laser Intensity on the Divergence of Laser-Generated Hot Electrons

V. M. Ovchinnikov, D. W. Schumacher, M. McMahon, E. A. Chowdhury, C. D. Chen, A. Morace, and R. R. Freeman
Phys. Rev. Lett. 110, 065007 – Published 8 February 2013

Abstract

We report on a numerical study of the effects of preplasma scale length and laser intensity on the hot-electron (1MeV) divergence angle using full-scale 2D3V (two dimensional in space, three dimensional in velocity) simulations including a self-consistent laser-plasma interaction and photoionization using the particle-in-cell code LSP. Our simulations show that the fast-electron divergence angle increases approximately linearly with the preplasma scale length for a fixed laser intensity. On the other hand, for a fixed preplasma scale length, the laser intensity has little effect on the divergence angle in the range between 1018 and 1021W/cm2. These findings have important implications for the interpretation of experimental results.

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  • Received 29 August 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.065007

© 2013 American Physical Society

Authors & Affiliations

V. M. Ovchinnikov1,2, D. W. Schumacher1, M. McMahon1, E. A. Chowdhury1, C. D. Chen3, A. Morace4,5, and R. R. Freeman1

  • 1The Ohio State University, Department of Physics, Columbus, Ohio 43210, USA
  • 2Innovative Scientific Solutions Inc., 2766 Indian Ripple Road, Dayton, Ohio 45440, USA
  • 3Lawrence Livermore National Laboratory, Livermore, California 94550, USA
  • 4University of Milano, Dipartimento di Fisica, Milano 20133, Italy
  • 5Center for Energy Research, University of California San Diego, La Jolla, California 92093, USA

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Vol. 110, Iss. 6 — 8 February 2013

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