等离子体二维密度重建的影响因素

Influence Factors in Two-Dimensional Plasma Density Reconstruction

利用超强超短激光脉冲产生的高能质子束的库仑能量损失可以重建稠密等离子体的二维密度分布,使用同时迭代重建算法（SIRT算法）研究等离子体二维密度重建的影响因素.研究等离子体密度梯度、密度量级和质子束入射能量对重建误差的影响,分析质子束成像探测等离子体密度之前获得等离子体大概方位的重要性,通过数据拟合确定了能量噪声和重建误差之间的解析关系式.

Two-dimensional density distributions of dense plasmas in laser confinement fusion are revealed with proton imaging.Simultaneous iterative reconstruction algorithm（SIRT） is used to study influence factors of two-dimensional plasma density reconstruction. Effects of plasma density gradient,magnitude of density and initial proton energies on reconstruction errors are investigated. Importance of figuring out rough area and range of simulated plasma zone before simulation is analyzed. Furthermore,an analytical expression between reconstruction errors and noises is established through data analyses.