Simultaneous stimulated Raman forward and backward scattering in hot, well- underdense plasmas

Seppo Karttunen, Rainer Salomaa

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

The competition of stimulated Raman forward scattering and backscattering in a hightemperature, underdense, nearly homogeneous plasma slab is investigated. In such plasmas Landau damping limits the growth of the Raman backscattering, and the weaker forward process may reach comparable levels. A modest seeding of one of the scattered electromagnetic waves influences the competition to a large extent. The conversion of the pump wave to scattered waves is calculated. The simultaneous operation of the two processes can lead to considerable modifications in the electron distribution; e.g., two hot tail components are formed because the plasma waves involved have different phase velocities. The generation regions of the scattering processes are spatially separated. Consequently, a large number of thermal electrons can be accelerated to very high energies in two stages. The backward plasmons preaccelerate the electrons and the faster plasmons, excited in the forward scattering, operate as a booster.
Original languageEnglish
Pages (from-to)75-89
Number of pages15
JournalLaser and Particle Beams
Volume10
Issue number1
DOIs
Publication statusPublished - 1992
MoE publication typeA1 Journal article-refereed

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forward scattering
plasmons
Forward scattering
backscattering
Plasmons
Scattering
Backscattering
Raman spectra
plasma slabs
Plasmas
boosters
Landau damping
Electrons
plasma waves
inoculation
electron distribution
scattering
phase velocity
Plasma waves
electromagnetic radiation

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Karttunen, Seppo ; Salomaa, Rainer. / Simultaneous stimulated Raman forward and backward scattering in hot, well- underdense plasmas. In: Laser and Particle Beams. 1992 ; Vol. 10, No. 1. pp. 75-89.
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Simultaneous stimulated Raman forward and backward scattering in hot, well- underdense plasmas. / Karttunen, Seppo; Salomaa, Rainer.

In: Laser and Particle Beams, Vol. 10, No. 1, 1992, p. 75-89.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Simultaneous stimulated Raman forward and backward scattering in hot, well- underdense plasmas

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AU - Salomaa, Rainer

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N2 - The competition of stimulated Raman forward scattering and backscattering in a hightemperature, underdense, nearly homogeneous plasma slab is investigated. In such plasmas Landau damping limits the growth of the Raman backscattering, and the weaker forward process may reach comparable levels. A modest seeding of one of the scattered electromagnetic waves influences the competition to a large extent. The conversion of the pump wave to scattered waves is calculated. The simultaneous operation of the two processes can lead to considerable modifications in the electron distribution; e.g., two hot tail components are formed because the plasma waves involved have different phase velocities. The generation regions of the scattering processes are spatially separated. Consequently, a large number of thermal electrons can be accelerated to very high energies in two stages. The backward plasmons preaccelerate the electrons and the faster plasmons, excited in the forward scattering, operate as a booster.

AB - The competition of stimulated Raman forward scattering and backscattering in a hightemperature, underdense, nearly homogeneous plasma slab is investigated. In such plasmas Landau damping limits the growth of the Raman backscattering, and the weaker forward process may reach comparable levels. A modest seeding of one of the scattered electromagnetic waves influences the competition to a large extent. The conversion of the pump wave to scattered waves is calculated. The simultaneous operation of the two processes can lead to considerable modifications in the electron distribution; e.g., two hot tail components are formed because the plasma waves involved have different phase velocities. The generation regions of the scattering processes are spatially separated. Consequently, a large number of thermal electrons can be accelerated to very high energies in two stages. The backward plasmons preaccelerate the electrons and the faster plasmons, excited in the forward scattering, operate as a booster.

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