Raman amplification in plasma: Wavebreaking and heating effects

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

A three-wave model has been developed to investigate the influence of wavebreaking and thermal effects on the Raman amplification in plasma This has been benchmarked against a particle-in-cell code with positive results A new regime, the "thermal chirp" regime, has been identified and illustrated Here the shift in plasma resonance due to heating of the plasma by a monochromatic pump allows a probe pulse to be amplified and compressed without significant pump depletion In regimes where damping dominates, it is found that inverse bremsstrahlung dominates at high densities, and improved growth rates may be achieved by preheating the plasma At low densities or high pump intensities, wavebreaking acts to limit amplification The inclusion of thermal effects can dramatically reduce the peak attainable intensity because of the reduced wavebreaking limit at finite temperatures (C) 2010 American Institute of Physics [doi 10 1063/1 3492713]

LanguageEnglish
Pages113301
Number of pages6
JournalPhysics of Plasmas
Volume17
Issue number11
DOIs
Publication statusPublished - Nov 2010

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pumps
heating
temperature effects
plasma resonance
chirp
bremsstrahlung
depletion
damping
inclusions
physics
probes
shift
pulses
temperature

Keywords

  • plasma density
  • plasma light propagation,
  • plasma Langmuir waves
  • plasma heating by laser
  • plasma simulation

Cite this

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title = "Raman amplification in plasma: Wavebreaking and heating effects",
abstract = "A three-wave model has been developed to investigate the influence of wavebreaking and thermal effects on the Raman amplification in plasma This has been benchmarked against a particle-in-cell code with positive results A new regime, the {"}thermal chirp{"} regime, has been identified and illustrated Here the shift in plasma resonance due to heating of the plasma by a monochromatic pump allows a probe pulse to be amplified and compressed without significant pump depletion In regimes where damping dominates, it is found that inverse bremsstrahlung dominates at high densities, and improved growth rates may be achieved by preheating the plasma At low densities or high pump intensities, wavebreaking acts to limit amplification The inclusion of thermal effects can dramatically reduce the peak attainable intensity because of the reduced wavebreaking limit at finite temperatures (C) 2010 American Institute of Physics [doi 10 1063/1 3492713]",
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Raman amplification in plasma: Wavebreaking and heating effects. / Farmer, J. P.; Ersfeld, B.; Jaroszynski, D. A.

In: Physics of Plasmas, Vol. 17, No. 11, 11.2010, p. 113301.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Raman amplification in plasma: Wavebreaking and heating effects

AU - Farmer, J. P.

AU - Ersfeld, B.

AU - Jaroszynski, D. A.

PY - 2010/11

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AB - A three-wave model has been developed to investigate the influence of wavebreaking and thermal effects on the Raman amplification in plasma This has been benchmarked against a particle-in-cell code with positive results A new regime, the "thermal chirp" regime, has been identified and illustrated Here the shift in plasma resonance due to heating of the plasma by a monochromatic pump allows a probe pulse to be amplified and compressed without significant pump depletion In regimes where damping dominates, it is found that inverse bremsstrahlung dominates at high densities, and improved growth rates may be achieved by preheating the plasma At low densities or high pump intensities, wavebreaking acts to limit amplification The inclusion of thermal effects can dramatically reduce the peak attainable intensity because of the reduced wavebreaking limit at finite temperatures (C) 2010 American Institute of Physics [doi 10 1063/1 3492713]

KW - plasma density

KW - plasma light propagation,

KW - plasma Langmuir waves

KW - plasma heating by laser

KW - plasma simulation

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