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Ablative stabilization of short wavelength Rayleigh-Taylor instability

S. Atzeni1996年被引用 7Nuclear FusionIF 3出版社

The linear evolution of the Rayleigh-Taylor instability (RTI) at the ablation front of a laser irradiated foil is studied by high resolution two dimensional Lagrangian hydrodynamic simulations, with simple initialization of the perturbation. Laser and target parameters relevant to reactor-size direct-drive laser fusion targets are considered. Growth rates smaller than the classical value and full stabilization at short wavelength are found. The results are well fitted by a dispersion relation of the form suggested by Takabe et al.(1985), with the parameters alpha =0.9 and beta =2.3, which can also reproduce the time dependent evolution of the growth rate, for weakly varying flow parameters

日本語訳

レーザー照射されたフォイルのアブレーション前面におけるレイリー・テイラー不安定性(RTI)の線形成長を、単純な摂動初期化を伴う高分解能二次元ラグランジュ流体シミュレーションによって研究した。炉規模の直接駆動レーザー核融合ターゲットに関連するレーザーおよびターゲットパラメータを考慮した。古典的な値よりも小さい成長率と、短波長における完全な安定化が見出された。結果は、Takabeら(1985)が提案した形式の分散関係によって良好に再現され、そのパラメータはα=0.9、β=2.3であり、この分散関係は流れのパラメータが弱く変化する場合の成長率の時間依存発展も再現できる。

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Rayleigh-Taylor instability
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