台面激光核聚变中子源研究进展

RECENT PROGRESS ON TABLE-TOP ULTRA\|INTENSE LASER INDUCED NUCLEAR FUSION NEUTRON SOURCE

通过超短脉冲激光与合适的介质相互作用 ,在普通光学实验室中可以产生聚变中子 .经过特殊设计的固体靶结构和特殊安排的级联过程 ,利用亚TW激光即可引发光核反应产生中子 .通过台面超强激光与固体靶相互作用 ,利用对离子的自导通道径向加速机制 ,可获得较多的高能离子和较多的中子产率 .由于超强激光辐照下大的团簇爆炸时可获得大量高能离子 ,团簇靶实验中实现的中子产率比相似激光能量的固体靶实验高两个量级 .文章讨论了上述三种产生中子的途径 ,对可能的发展方向进行了简单分析 .

We review the recent development of table\|top neutron sources pumped by table\|top terawatt(T\+3)ultrashort laser pulses.By means of a specially designed target structure and cascade process,sub\|terawatt lasers are capable of producing substantial amounts of neutrons through photonuclear reactions.Through the interaction of a well\|designed ultra\|intense laser with a solid target,a relative strong ps laser pulse can mega\|ampere ion currents energy of 50\_150keV,providing an opportunity to obtain large neutron yields at the laser focus.The explosion of large atomic clusters irradiated by fs laser pulses has produced a superheated microplasma that ejects ions with kinetic energies up to 1MeV,with a much higher meutron yield than that in solid target experiments irradiated by a similar fs laser.These interesting approaches,as well as some important physical details,are discussed and analyzed.