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Physics of Plasmas / Volume 15 / Issue 7 / ARTICLES / Lasers, Particle Beams, Accelerators, Radiation Generation

Phys. Plasmas 15, 073111 (2008); doi:10.1063/1.2956989 (10 pages)

Controlled electron injection into the wake wave using plasma density inhomogeneity

A. V. Brantov1, T. Zh. Esirkepov2, M. Kando2, H. Kotaki2, V. Yu. Bychenkov1, and S. V. Bulanov2

1P. N. Lebedev Physics Institute, Russian Academy of Science, Leninskii Prospect 53, Moscow 119991, Russia
2Kansai Photon Science Institute, Japan Atomic Energy Agency, 8-1 Umemidai, Kizugawa, Kyoto, 619-0215, Japan

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(Received 20 March 2008; accepted 20 June 2008; published online 22 July 2008)

The electron injection, for the laser wake field accelerator, controlled through the plasma density inhomogeneity is studied on a basis of analytical estimates and two- and three-dimensional particle-in-cell simulations. The injection scheme requires a concordance of the density scale length and laser intensity. It is shown that at a sloping inhomogeneity of plasma the wave breaking produces stronger singularity of the electron density than at a density discontinuity, but develops slower. With the help of simulations for a moderate laser intensity, we demonstrate the optimal plasma density gradient, where the electron injection into the wake wave forms the electron beam with low divergence, small energy spread and high energy.

© 2008 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. THE TRAPPING CONDITION FOR THE ELECTRON INJECTION DURING THE WAKE WAVE BREAKING AT THE DENSITY GRADIENT
    1. Nonlinear Langmuir waves in inhomogeneous plasmas
    2. The wake wave breaking
    3. Electron trapping
  3. SIMULATION RESULTS
    1. The case of a moderately relativistic laser pulse
    2. Electron injection and acceleration in the case of a relativistically intense laser pulse
  4. CONCLUSIONS AND DISCUSSIONS

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KEYWORDS and PACS

Keywords

electron density, plasma density, plasma light propagation, plasma simulation, wakefield accelerators, wakes

PACS

  • 52.38.Kd

    Laser-plasma acceleration of electrons and ions

  • 52.25.Os

    Emission, absorption, and scattering of electromagnetic radiation

  • 52.65.Rr

    Particle-in-cell method

ARTICLE DATA

Permalink
http://link.aip.org/link/doi/10.1063/1.2956989

PUBLICATION DATA

ISSN:

1070-664X (print)  
1089-7674 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

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