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

利用皮秒级高相干强流自由电子激光对核反应堆容器、核燃料组件等厚大结构材料进行了非热加工实验研究。利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4合金板进行了切割试验。这些比较表明，自由电子激光，非常窄的宽度有效的非热处理这些结构材料是可能的。窄加工或切割的基本条件进行了验证，使用纳秒脉冲激光。结果，激光和光导光学系统的技术规格被揭示和实验证实。

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.