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Validating heat balance models for tungsten dust in cold dense plasmas

机译：验证冷致密等离子体中钨粉尘的热平衡模型

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摘要

The first comparison of dust radius and surface temperature estimates, obtained from spectroscopic measurements of thermal radiation, with simulations of dust heating and vaporization by the MIGRAINe dust dynamics code is reported. The measurements were performed during controlled tungsten dust injection experiments in the cold and dense plasmas of Pilot-PSI, reproducing ITER divertor conditions. The comparison has allowed us to single out the dominating role of the work function contribution to the dust heating budget. However, in the plasmas of interest, dust was found to enter the strong vaporization regime, in which its temperature is practically insensitive to plasma properties and the various uncertainties in modeling. This makes the dust temperature a poor figure of merit for model validation purposes. On the other hand, simple numerical scalings obtained from orbital-motion-limited estimates were found to be remarkably robust and sufficient to understand the main physics at play in such cold and dense plasmas.
机译：据报道，从热辐射的光谱测量获得的灰尘半径和表面温度估计的第一次比较，具有偏头痛粉尘动力学代码的灰尘加热和蒸发的模拟。在导频 - PSI的冷热等离子体中的控制钨除尘实验期间进行测量，再现迭代置位方形条件。比较使我们能够将工作职能贡献的占主导地位的作用占用给灰尘加热预算。然而，在感兴趣的等离子体中，发现灰尘进入强汽化制度，其中其温度实际上对等离子体性质和建模中的各种不确定性。这使得灰尘温度成为模型验证目的的差的优点。另一方面，发现从轨道运动有限的估计获得的简单数值缩放是非常稳健的，并且足以了解在这种寒冷和致密的等离子体中游戏的主要物理。

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