Extended research related to the direct observation and control of liquid metal flow dynamics

作为探索性工作的真正延伸，首次提出使用相干VUV辐射直接观察和主动控制钠流动动力学，我们进一步扩展了其工程能力，以证明“透明钠”的证明命题实际上适用于反应堆相关条件，速度场测量的空间分辨率也可以得到充分提高，以便与大规模模拟结果进行比较。并进行了从头计算。作为从诱导的拉曼散射的发射的替代，电子束激发的Ar准分子源已被采用，这大大增加了信号强度。此外，还介绍了一种成像光谱仪来识别微量石墨颗粒中的光学成分。因此，它表明，二维液体钠流速度场可以解决在几毫米的分辨率。

As a bona fide extension of the exploratory work, where direct observation and active control of sodium flow dynamics have first been proposed using coherent VUV radiation, we have further extended its engineering capability to demonstrate that the proven proposition of 'transparent sodium' is practically applicable to reactor-relevant conditions, and spatial resolution of the velocity field measurement could also be improved sufficiently for comparison with large-scale simulation results. The ab-initio calculations have also been carried out. As a replacement of the emission from the induced Raman scattering, an electron-beam excited Ar excimer source has been employed, which has substantially increased the signal intensity. In addition, an imaging spectrometer has been introduced to identify the optical components from the trace graphite particles. Consequently, it was shown that the 2D liquid sodium flow velocity field could be resolved within the resolution of a few mm.