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Inverse bremsstrahlung absorption in spherical laser targets

J A Nicolas, J R Sanmartin1985年Plasma Physics and Controlled FusionIF 2.2出版社

Inverse bremsstrahlung has been incorporated into an analytical model of the expanding corona of a laser-irradiated spherical target. Absorption decreases slowly with increasing intensity, in agreement with some numerical simulations, and contrary to estimates from simple models in use up to now, which are optimistic at low values of intensity and very pessimistic at high values. Present results agree well with experimental data from many laboratories; substantial absorption (>0.5) is found up to moderate intensities, say below 1015 W cm-2 for 1.06 mu m light. Anomalous absorption, when included in the analysis, leaves practically unaffected the ablation pressure and mass ablation rate, for given absorbed intensity. Universal results are given in dimensionless form.

日本語訳

逆制動放射は、レーザー照射された球状ターゲットの膨張コロナの解析モデルに組み込まれた。吸収は強度の増加とともに緩やかに減少し、これは一部の数値シミュレーションと一致するが、これまで使用されてきた単純なモデルによる推定とは対照的であり、それらのモデルは低強度では楽観的で、高強度では非常に悲観的であった。本結果は、多くの実験室からの実験データとよく一致する。実質的な吸収(>0.5)は、1.06 μm 光に対して 10^15 W cm^-2 以下の適度な強度まで見られる。異常吸収を解析に含めても、与えられた吸収強度に対するアブレーション圧力と質量アブレーション率にはほとんど影響を及ぼさない。普遍的な結果は無次元形式で示される。

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