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Neutral transport simulations of gas puff imaging experiments

机译:吹气成像实验的中性传输模拟

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Visible imaging of gas puffs has been used on the Alcator C-Mod tokamak to characterize edge plasma turbulence, yielding data that can be compared with plasma turbulence codes. Simulations of these experiments with the DEGAS 2 Monte Carlo neutral transport code have been carried out to explore the relationship between the plasma fluctuations and the observed light emission. By imposing two-dimensional modulations on the measured time-average plasma density and temperature profiles, we demonstrate that the spatial structure of the emission cloud reflects that of the underlying turbulence. However, the photon emission rate depends on the plasma density and temperature in a complicated way, and no simple scheme for inferring the plasma parameters directly from the light emission patterns is apparent. The simulations indicate that excited atoms generated by molecular dissociation are a significant source of photons, further complicating interpretation of the gas puff imaging results. (C) 2003 Elsevier Science B.V. All rights reserved. [References: 12]
机译:在Alcator C-Mod托卡马克上已使用可见的吹气成像来表征边缘等离子湍流,并产生可以与等离子湍流代码进行比较的数据。用DEGAS 2蒙特卡洛中性传输码对这些实验进行了仿真,以探索等离子体波动与观察到的光发射之间的关系。通过对测得的时间平均等离子体密度和温度分布图施加二维调制,我们证明了发射云的空间结构反映了潜在湍流的空间结构。然而,光子发射速率以复杂的方式取决于等离子体密度和温度,并且没有简单的方案直接从发光图案中推断出等离子体参数是显而易见的。模拟表明,由分子解离产生的激发原子是光子的重要来源,这进一步使气体抽吸成像结果的解释复杂化。 (C)2003 Elsevier Science B.V.保留所有权利。 [参考:12]

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