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.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
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)
关键词
惯性约束聚变
X射线背光照相
针孔成像
空间分辨
inertial confinement fusion
X-ray backlighting imaging
pinhole imaging
spatial resolution
