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Electron temperature versus laser intensity times wavelength squared: a comparison of theory and experiments

R. Ramis, J.R. Sanmartín1983年被引用 17Nuclear FusionIF 3出版社

The peak temperature in the corona of plasma ejected by a laser-irradiated slab is discussed in terms of a one-electron-temperature model. Both heat-flux saturation and pulse rise-time effects are considered; the intensity in the rising half of the pulse is approximated by a linear function of time, I(t) ≡ I0t/τ. The temperature is found to be proportional to (I0λ2)2/3 and a function of I0λ4/τ. Above a certain value of I0λ4/τ, the plasma presents two characteristic temperatures (at saturation and at the critical surface) which can be identified with experimentally observed cold- and hot-electron temperatures. The results are compared with extensive experimental data available for both Nd and CO2 lasers, I0(W·cm−2) λ2 (μm) starting around 1012. The agreement is good if substantial flux inhibition is assumed (flux-limit factor f ≅ 0.03), and fails for I0λ2 above 1O15. Results for both ablation pressure and mass ablation rate are also given.

日本語訳

レーザー照射されたプラズマによって放出されるコロナのピーク温度を、単一電子温度モデルに基づいて考察する。熱流束の飽和効果とパルス立ち上がり時間の両方が考慮される。パルスの立ち上がり部分における強度は時間の線形関数、すなわちI(t) ≡ I₀t/τで近似される。温度は(I₀λ²)^(2/3)に比例し、I₀λ⁴の関数であることが見出される。I₀λ⁴がある値を超えると、プラズマは(飽和時および臨界表面において)二つの特徴的な温度を示し、これらは実験的に観測される低温および高温電子温度と対応づけられる。結果は、NdレーザーおよびCO₂レーザーの両方について、I₀(W·cm⁻²)λ²(μm)が約10¹²から始まる広範な実験データと比較される。 substantialなフラックス抑制(フラックス制限因子f ≒ 0.03)を仮定すれば一致は良好であり、I₀λ²が10¹⁵を超えると一致は成立しない。アブレーション圧力とアブレーション質量速度の両方についての結果も示される。

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