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Autoresonant beat-wave generation

Phys. Plasmas 13, 123103 (2006); doi:10.1063/1.2390692

Published 7 December 2006

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R. R. Lindberg, A. E. Charman, and J. S. Wurtele
University of California, Berkeley Department of Physics, Berkeley, California 94720 and Lawrence Berkeley National Laboratory Center for Beam Physics, Berkeley, California

L. Friedland
Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel

B. A. Shadwick
Lawrence Berkeley National Laboratory LOASIS Program, Berkeley, California and Institute for Advanced Physics, Conifer, Colorado 80433
Autoresonance offers an efficient and robust means for the ponderomotive excitation of nonlinear Langmuir waves by phase-locking of the plasma wave to the slowly chirped beat frequency of the driving lasers via adiabatic passage through resonance. This mechanism is analyzed for the case of a cold, relativistic, underdense electron plasma, and its suitability for particle acceleration is discussed. Compared to traditional approaches, this new autoresonant scheme achieves larger accelerating electric fields for given laser intensity; the plasma wave excitation is much more robust to variations in plasma density; it is largely insensitive to the precise choice of chirp rate, provided only that it is sufficiently slow; and the suitability of the resulting plasma wave for accelerator applications is, in some respects, superior. As in previous schemes, modulational instabilities of the ionic background ultimately limit the useful interaction time, but nevertheless peak electric fields approaching the wave-breaking limit seem readily attainable. The total frequency shift required is only of the order of a few percent of the laser carrier frequency, and might be implemented with relatively little additional modification to existing systems based on chirped pulse amplification techniques, or, with somewhat greater technological effort, using a CO2 or other gas laser system. ©2006 American Institute of Physics
History: Received 7 August 2006; accepted 18 October 2006; published 7 December 2006
Permalink: http://link.aip.org/link/?PHPAEN/13/123103/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.38.Kd
    Laser–plasma acceleration of electrons and ions
  • 52.35.Fp
    Plasma electrostatic waves and oscillations e.g., ion-acoustic waves
  • YEAR: 2006

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