快点火背光照相数值模拟  

Monte Carlo simulation on X-ray backlighting imaging in fast ignition research

作　　者：韩丹[1] 赵宗清[1] 单连强[1] 谭放[1] 

机构地区：[1]中国工程物理研究院激光聚变研究中心 等离子体物理重点实验室,四川绵阳621900

出　　处：《强激光与粒子束》2012年第8期1861-1866,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(10905051);中国工程物理研究院院发展基金项目(2011B0102021;2009A0102003)

摘　　要：在激光惯性约束聚变实验研究中,诊断燃料层密度通常利用纳秒激光束辐照金属靶片产生特征X射线作为背光照明光源,对内爆球壳进行瞬态辐射照相,进而推断球壳内爆燃料层的密度。利用蒙特卡罗程序,对快点火X射线背光照相进行了研究,模拟了针孔成像中不同的针孔大小、障板厚度、背光能量对成像质量的影响,对于快点火实验中微米尺寸塑料小球,进行了诊断方案优化。模拟结果表明,综合考虑光通量及成像空间分辨,针孔半径为10μm时成像效果最佳;此时,采用2.7 keV的Mo背光源可以获得最佳的密度分辨。In fast ignition researches,fuel density is usually diagnosed by X-ray backlighting imaging with an X-ray source produced by laser irradiating metal target.The simulation on the X-ray backlighting imaging has been performed using a Monte Carlo code（MCNPs）.The influence on imaging quality induced by the radius and thickness of pinhole,and the energy of X-ray source were investigated.The simulation results show that,the combination of a pinhole with 10 μm radius and a X-ray source with 2.7 keV energy,corresponding to Ka line of Mo,is the optimum choice,when both the luminous flux and the spatial resolution of imaging are concerned.

关 键 词：惯性约束聚变 X射线背光照相 针孔成像 空间分辨 

分 类 号：O536[理学—等离子体物理]