作　　者： ; ; ; ; ; ; ; ; (李镛周）; (南性模）; (韩载旻）;

机构地区： 中国工程物理研究院激光聚变研究中心

出　　处： 《强激光与粒子束》 2008年第12期2017-2021,共5页

摘　　要： 利用低温脉冲气阀获得了平均含有3×103氘原子的氘团簇。在飞秒激光装置上实现了氘团簇聚变,每发中子产额为1×103。中子产额对激光功率密度敏感,保持激光能量不变,随着激光焦斑的变大,DD聚变中子产额逐渐增加,最大值出现在激光焦斑为470μm时;继续增大激光焦斑,没有观察到中子信号。实验结果还表明激光氘团簇聚变发生的区域主要是激光辐照的等离子体热区,此区域内邻近氘团簇库仑爆炸发射的高能氘离子碰撞引发聚变反应。 Large deuterium clusters were produced in a supersonic expansion of high pressure gases into vacuum through a 0.5 mm nozzle. The average size clusters （with 3 × 10^3 atoms） was verified by measuring the Rayleigh scattered signal using a He-Ne laser beam. Neutrons （2.45 MeV） from deuterium clusters fusion induced by the intense femtosecond （30 fs） laser pulse is experimentally demonstrated. The average neutron yield of 1 × 10^3 per shot was obtained. The yield grew slightly with the increasing of the laser spot size. No neutron was observed when the laser spot was larger than 470 micron. The fusion events mainly happened in the hot plasma region radiated by the intense laser.

关 键 词： 超强超短脉冲激光 氘团簇聚变 中子 飞行时间 有质动力 等离子体

领　　域： [理学] [理学]