加速器储存环中的粒子轰击真空室表面产生二次电子，大量的二次电子聚集形成电子云，高密度的电子云造成储存环动态气压上升、束流损失、寿命降低，制约高频功率，其危害已成为新一代粒子加速器建造瓶颈，制约着粒子加速器向高能、高亮度和高稳定性的方向发展。研究表明高功率激光照射材料表面可以降低材料二次电子产额，制备方法简单、可在大气中进行、成本低廉、易行、表层性能稳定，没有寿命问题。开展材料激光刻蚀低二次电子产额机理和关键技术的科学课题研究、分析测试，找出激光刻蚀材料二次电子产额SEY＜1.0的机理及关键工艺技术。开展激光刻蚀材料表面沉积NEG吸气合金材料，使处理材料具有低二次电子产额同时具有优良的真空抽气性能研究具有创新的科学研究，彻底解决未来加速器储存环真空系统建造瓶颈问题。项目研究成果将为新一代粒子加速器的储存环真空系统的建造提供理论依据、实施方案和技术支持。

Scattered electrons and photoelectrons in storage ring strike on the wall of vacuum chamber and produce secondary electrons, which accumulate as electron cloud. Intense electron cloud will cause increase of dynamic pressure, beam loss, decrease of beam life, suppression of high-frequency power, decrease of microwave device life. Electron cloud has become a limiting factor for the new generation particle accelerator with high energy, high luminosity and high stability. Studies show that surface of vacuum chambers have low secondary electron yield (SEY) after exposure to high power laser (laser ablation), which can be accomplished in air with low cost, simple apparatus, good surface stability and infinite operation life. The mechanism and key technology of laser ablation will be carried out to prepare surface with SEY lower than 1.0. The laser etched surface will show low SEY as well as good pumping stability after being deposited with NEG film. This study will eliminate the limiting factor and supply theoretical foundation, implementation scheme and technique support for vacuum system construction of new generation particle accelerator.