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首页> 外文期刊>Plasma and Fusion Research >Numerical Study on Radiation Trapping of He I Resonance Lines in Arc Plasma Under High-Gas Pressures
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Numerical Study on Radiation Trapping of He I Resonance Lines in Arc Plasma Under High-Gas Pressures

机译：高气压下弧等离子体中谐振线辐射诱捕的数值研究

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In high-gas pressure helium arc plasmas, a forbidden line (1s 1S-2p 3P : 59.1 nm) as well as the resonance lines 1s 1S - np 1P lines of He I have been observed. The intensity ratio of the 1s 1S - 2p 1P line of He I to forbidden line calculated from the Einstein A coefficients (NIST database) is ～10?7, whereas the value obtained experimentally was as small as ～20. The reason for the discrepancy between the experiment and database can be interpreted from that the photoabsorption (self-absorption) of the resonance lines 1s 1S - np 1P lines can cause the drastic change in radiative processes in high-pressure plasmas. In order to validate our interpretation on this mismatch, we investigated the influence of self-absorption of the resonance lines 1s 1S - np 1P lines by numerical simulations. The simulation code calculated the photoabsorption process by He atom along a line-of-sight by using coupled rate equations incorporated with the radiation trapping effect. As a result, the simulation yielded the line intensity ratio of 25 because of the strong self-absorption.
机译：在高气体压力氦弧等离子体中，禁止线（1S 1S-2P 3P：59.1NM）以及他已经观察到他的谐振线1S-1P线。从EINSTEIN A系数（NIST数据库）计算的1S 1 - 2P 1P线的强度比是〜10？7，而实验获得的值是小于〜20的值。实验和数据库之间的差异的原因可以解释为谐振线1s-np1p线的光吸收（自吸收）可以引起高压等离子体中的辐射过程中的急剧变化。为了验证我们对这种不匹配的解释，我们研究了数值模拟的共振线1S-NP 1P线路1S-NP 1P线的自吸收的影响。模拟代码通过使用包含辐射捕获效果的耦合速率方程来计算沿着视线沿视线的自由瞄准的光吸收过程。结果，由于强烈的自吸收，模拟产生了25的线强度比。

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