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Parametric instabilities in large nonuniform laser plasmas

H A Baldis, D S Montgomery, J D Moody, C Labaune, S H Batha, K G Estabrook, R L Berger, W L Kruer1992年Plasma Physics and Controlled FusionIF 2.2出版社

The study of parametric instabilities in laser plasmas is of vital importance for inertial confinement fusion (ICF). The long scale-length plasma encountered in the corona of an ICF target provides ideal conditions for the growth of instabilities such as stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS), and filamentation. These instabilities can have detrimental effects in ICF and their characterization and understanding is of importance. Scattering instabilities are driven through a feedback loop by which the beating between the electromagnetic EM fields of the laser and the scattered light matches the frequency of a local longitudinal mode of the plasma. Any process which interferes with the coherence of this mechanism can substantially alter the behavior of the instability.

日本語訳

レーザープラズマにおけるパラメトリック不安定性の研究は、慣性閉じ込め核融合(ICF)にとって極めて重要である。ICFターゲットのコロナ中に存在する長スケール長のプラズマは、誘導ブリルアン散乱(SBS)、誘導ラマン散乱(SRS)、フィラメンテーションなどの不安定性が成長するための理想的な条件を提供する。これらの不安定性はICFに悪影響を及ぼす可能性があり、その特性評価と理解は重要である。散乱不安定性は、レーザーの電磁場と散乱光の電磁場との間のビーティングが、プラズマの局所的な縦モードの周波数と一致するフィードバックループによって駆動される。このメカニズムのコヒーレンスを妨害するいかなる過程も、不安定性の挙動を大きく変化させ得る。

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Parametric instabilities
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