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Non-linear interaction of intense CO2 radiation with dense plasma

B. Grek, H. Pepin, T.W. Johnston, J.N. Leboeuf, H.A. Baldis1977年被引用 15Nuclear FusionIF 3出版社

Experimental results of the interaction of short (1.5 ns) CO2 laser pulses with solid targets at a flux reaching 1013 W/cm2 are presented. An attempt is made to carry out a global series of measurements and interpret them in the light of currently available theory. The absorption, reflection, ion and X-ray emission (line and continuum) and in considerable detail the infra-red emission spectra of the plasma in the vicinity of the incident 10.6 µm radiation as well as its harmonics were measured. From the emission spectra the existence of the parametric decay and the stimulated Brillouin backscatter instabilities was identified. Furthermore, the energy and angular dependence of the reflected-light calorimetry in addition to the X-ray and ion emission results are found to be consistent with the hypothesis that the interaction of high power CO2 lasers with plasmasis dominated by non-linear effects such as the parametric decay instability.

日本語訳

短パルス(1.5 ns)CO2レーザーと固体ターゲットとの相互作用において、フラックスが10¹³ W/cm²に達する場合の実験結果を示す。包括的な一連の測定を行い、現在利用可能な理論に基づいてそれらを解釈する試みがなされた。吸収、反射、イオンおよびX線放出(線スペクトルおよび連続スペクトル)、ならびにプラズマにおける入射10.6 µm放射およびその高調波近傍の赤外線放出スペクトルが詳細に測定された。放出スペクトルから、パラメトリック崩壊不安定性および誘導ブリルアン後方散乱不安定性の存在が同定された。さらに、反射光の熱量測定におけるエネルギーおよび角度依存性は、X線およびイオン放出の結果とともに、高パワーCO2レーザーとプラズマとの相互作用がパラメトリック崩壊不安定性などの非線形効果によって支配されるという仮説と一致することが見出された。

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