Global Simulation for Laser-Driven MeV Electrons in Fast Ignition

C. Ren, M. Tzoufras, F. S. Tsung, W. B. Mori, S. Amorini, R. A. Fonseca, L. O. Silva, J. C. Adam, and A. Heron
Phys. Rev. Lett. 93, 185004 – Published 28 October 2004


A comprehensive examination of the interaction of a picosecond-long ignition pulse on high-density (40 times critical density) pellets using a two-dimensional particle-in-cell model is described. The global geometry consists of a 50   μm diameter pellet surrounded by a corona which is isolated by a vacuum region from the boundary. For cone-attached targets, as much as 67% of the incident laser energy is absorbed with 12% sent forward as fast electrons in a 23° cone. The current filaments are driven by the Weibel instability of the forward-going fast electron flux and its return current with the ions playing an important role of neutralizing the space charge. No global current filament coalescence has been observed. The electron distribution function obeys a power law, which begins at E0.2MeV and falls off as E(23).

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  • Received 31 October 2003


©2004 American Physical Society

Authors & Affiliations

C. Ren1,*, M. Tzoufras2, F. S. Tsung1, W. B. Mori1,2, S. Amorini3, R. A. Fonseca3, L. O. Silva3, J. C. Adam4, and A. Heron4

  • 1Department of Physics & Astronomy, University of California, Los Angeles, California 90095, USA
  • 2Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA
  • 3GoLP/Centro de Fisica dos Plasmas, Instituto Superior Tecnico, 1049-001 Lisboa, Portugal
  • 4Ecole Polytechnique, France

  • *Present address: Department of Mechanical Engineering, University of Rochester, Rochester, NY 14627, USA.

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Vol. 93, Iss. 18 — 29 October 2004

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January 27, 2017

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