针对大体量含氚水分离净化的需求，自主设计建设了三塔级联水精馏系统，内部装填有自研高性能填料。在中试实验过程中，以5～10 kg/h的处理量，完成了吨量级含氚轻水的分离处理，实现了贫化倍数高于2 000倍、富集倍数高于20倍的分离效果。测得规整填料等板高度为14 cm，散堆填料等板高度为4 cm，运行过程各关键参数稳定，全系统已稳定运行超过900 h，可满足规模化工程放大的要求。

In order to reveal the evolution mechanism of repaired morphology and the material’s migration mechanism on the crack surface in the process of CO2 laser repairing surface damage of fused silica optics, two multi-physics coupling mathematical models with different scales are developed, respectively. The physical problems, such as heat and mass transfer, material phase transition, melt flow, evaporation removal, and crack healing, are analyzed. Studies show that material ablation and the gasification recoil pressure accompanying the material splash are the leading factors in forming the Gaussian crater with a raised rim feature. The use of low-power lasers for a long time can fully melt the material around the crack before healing, which can greatly reduce the size of the residual air layer. Combined with the experimental research, the methods to suppress the negative factors (e.g., raised rim, deposited debris, air bubbles) in the CO2 laser repairing process are proposed.