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Physics of Plasmas / Volume 17 / Issue 2 / ARTICLES / Lasers, Particle Beams, Accelerators, Radiation Generation

Phys. Plasmas 17, 023105 (2010); http://dx.doi.org/10.1063/1.3309488 (6 pages)

Supra-bubble regime for laser acceleration of cold electron beams in tenuous plasma

V. I. Geyko1, I. Y. Dodin1, N. J. Fisch1, and G. M. Fraiman2

1Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA
2Institute of Applied Physics, RAS, 46 Ulyanov Street, Nizhny Novgorod 603950, Russia

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(Received 17 November 2009; accepted 14 January 2010; published online 11 February 2010)

Relativistic electrons can be accelerated by an ultraintense laser pulse in the “supra-bubble” regime, that is, in the blow-out regime ahead of the plasma bubble (as opposed to the conventional method, when particles remain inside the bubble). The acceleration is caused by the ponderomotive force of the pulse, via the so-called snow-plow mechanism. The maximum energy gain, Δγ ∼ γga, is attained when the particle Lorentz factor γ is initially about γg/a, where γg is the pulse group speed Lorentz factor, and a is the laser parameter, proportional to the laser field amplitude. The scheme operates at a≲γg, yielding Δγ of up to that via wakefield acceleration for the same plasma and laser parameters, Δγ ∼ γg2. The interaction length is shorter than that for the wakefield mechanism but grows with the particle energy, hindering acceleration in multiple stages.

© 2010 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. BASIC EQUATIONS
  3. SNOW-PLOW ACCELERATION
  4. STAGED SNOW-PLOW ACCELERATION
  5. COMPARISON WITH LWFA
  6. APPLICABILITY CONDITIONS
    1. Electrostatic potential
    2. Transverse effects
    3. Pulse distortion
  7. CONCLUSIONS

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KEYWORDS and PACS

Keywords

plasma heating by laser, plasma light propagation, relativistic electron beams

PACS

  • 52.38.Kd

    Laser-plasma acceleration of electrons and ions

  • 41.75.Ht

    Relativistic electron and positron beams

  • 45.20.Jj

    Lagrangian and Hamiltonian mechanics

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3309488

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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