等离子体-分子相互作用对分离过程中粒子平衡影响的研究
A study of the influence of plasma-molecule interactions on particle balance during detachment
摘要：
在这项工作中，我们提供的等离子体分子相互作用的影响，在偏滤器分离过程中，通过在TCV托卡马克的核心密度斜坡的目标离子通量减少的实验见解。我们改进的氢巴耳末系的分析表明，等离子体分子的过程是强烈的巴耳末系强度的贡献，并大大改变偏滤器脱离粒子平衡。我们发现，分子活化的结晶（MAR）离子汇从$H_2^+$和/或$H^-$是一个因素$\sim$ 5大于电子离子结晶（EIR），是一个显着的贡献者观察到的减少外偏滤器离子靶通量。在分离过程中，分子活化电离（MAI）也可能很重要。等离子体分子相互作用增强的巴耳末线系列发射强烈附近的目标作为脱离的收益。这表明莱曼系的增强，可能影响偏滤器中的功率平衡。由于这些增强在偏滤器中在空间上变化，并且对于不同的跃迁是不同的，因此预计它们将导致$Lyβ$和$Lyα$发射区的分离。这可能对偏滤器混浊的治疗和诊断有意义。通过等离子体分子过程对巴耳末系的增强可能对使用巴耳末系仅基于原子-等离子体过程来理解和诊断脱离构成挑战。
英文摘要：
In this work we provide experimental insights into the impact of plasma-molecule interactions on the target ion flux decrease during divertor detachment achieved through a core density ramp in the TCV tokamak. Our improved analysis of the hydrogen Balmer series shows that plasma-molecule processes are strongly contributing to the Balmer series intensities and substantially alter the divertor detachment particle balance. We find that Molecular Activated Recombination (MAR) ion sinks from $H_2^+$ and/or $H^-$ are a factor $\sim$ 5 larger than Electron-Ion Recombination (EIR) and are a significant contributor to the observed reduction in the outer divertor ion target flux. Molecular Activated Ionisation (MAI) may also be significant during detachment. Plasma-molecule interactions enhance the Balmer line series emission strongly near the target as detachment proceeds. This indicates enhancements of the Lyman series, potentially affecting power balance in the divertor. As those enhancements vary spatially in the divertor and are different for different transitions, they are expected to result in a separation of the $Lyβ$ and $Lyα$ emission regions. This may have implications for the treatment and diagnosis of divertor opacity. The demonstrated enhancement of the Balmer series through plasma-molecule processes potentially poses a challenge to using the Balmer series for understanding and diagnosing detachment based only on atom-plasma processes.
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