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The crossed-beam energy transfer model without empirical factor for multi-beam irradiation of a spherical laser target

N N Demchenko2022年Plasma Physics and Controlled FusionIF 2.2出版社

Stimulated Brillouin scattering of laser radiation in an expanding plasma during compression of a spherical target can significantly reduce the fraction of absorbed energy. A model of CBET (crossed-beam energy transfer) stimulated scattering under multi-beam irradiation of a spherical target has been developed. The model does not contain empirical factor, unlike the model known in the literature. This makes it possible to use it in calculations for the conditions of planned experiments. Calculations of the fraction ΔCB of energy released from the plasma due to CBET scattering for experimental conditions at the OMEGA installation have been carried out. It is shown that this fraction depends on the factor fe of the electron heat flux limitation. With fe values in the range 0.04–0.06, the calculated values of ΔCB (0.12–0.084) are close to the value 0.1 obtained in the experiment and in numerical simulation at fe = 0.06.

日本語訳

球状ターゲットの圧縮中における膨張プラズマ中のレーザー放射の誘導ブリルアン散乱は、吸収エネルギーの割合を著しく減少させ得る。球状ターゲットの多ビーム照射下におけるCBET(交差ビームエネルギー輸送)誘導散乱のモデルが開発された。このモデルは、文献で知られているモデルとは異なり、経験的因子を含まない。これにより、計画された実験の条件に対する計算への適用が可能となる。OMEGA施設での実験条件に対するCBET散乱によるプラズマから放出されるエネルギーの割合ΔCBの計算が実施された。この割合は、電子熱流束制限の因子feに依存することが示された。feの値が0.04〜0.06の範囲において、ΔCBの計算値(0.12〜0.084)は、fe = 0.06での実験および数値シミュレーションで得られた値0.1に近い。

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