Fundamental research of non-thermal process using free electron laser with short pulses

利用高相干、高强度的皮秒脉冲自由电子激光，对核反应堆容器和核燃料组件等厚重结构材料进行了非热加工实验研究。用自由电子激光和一种最先进的商用激光器对燃料管材料--锆合金板材进行了切割试验。比较表明，利用自由电子激光，可以对这些结构材料进行非常窄的、高效的非热加工。利用纳秒脉冲激光验证了窄加工或窄切割的基本条件。结果揭示了激光和导光光学系统的技术指标，并在实验上得到了证实。

An experimental research was performed on the non-thermal processing of heavy and thick structure materials like a nuclear reactor vessel and nuclear fuel assembly, with using highly coherent and intense free electron laser (FEL) of pico-second pulses. Zircaloy4 alloy plates, which is material of fuel tube were tried and cut with FEL, and a state-of-art commercially available laser. The comparison of these showed that with FEL, very narrow-width efficient non-thermal processing is possible for those structure materials. Fundamental conditions for narrow processing or cutting were verified with using a nano-second pulse laser. As a result, technical specifications of laser lights and of optical systems for light guiding, were revealed and confirmed experimentally.