高能质子束探测稠密不均匀氘氚等离子体密度的SIRT算法(英文)  

SIRT Method for Diagnostics of Inhomogeneous Dense DT Plasmas with Fast Protons

作　　者：李雪梅[1,2] 沈百飞[2] 张晓梅[2] 王志文[1] 何燕和[1] 

机构地区：[1]广西民族大学物理与电子工程学院,广西南宁530006 [2]中国科学院上海光学精密机械研究所强场激光重点实验室,上海201800

出　　处：《计算物理》2011年第1期75-80,共6页Chinese Journal of Computational Physics

基　　金：Supported by Foundation of Guangxi University for Nationalities(Grant No 2008QD018);973 Programe in China(Grant No 2006CB806004);National Natural Science Foundation of China(Grant No 10675155 and 10834008)

摘　　要：应用同时迭代重建算法(SIRT)重建不均匀稠密氘氚等离子体的密度分布.在二维等离子体密度重建的数值模拟中,探测稠密等离子体的高能质子束可以由强激光和等离子体相互作用产生,且质子束经过稠密等离子体后的能量损失是比较重要的.如果已知入射质子束和出射质子束的能量分布,可以在出射质子束能量测量的误差水平未知的情况下用SIRT算法重建等离子体的密度分布.结果显示,SIRT算法的精确度高于以L-曲线为准则的Tikhonov正则化方法,并可以在数据量不完全时重建密度分布.Density reconstruction of inhomogeneous dense DT plasmas is studied with simultaneous iterative reconstruction technique（SIRT）.In simulation of density diagnostics of a two-dimensional（2D） slice plasma,fast protons used fordiagnostics can be generated with laser-plasma interaction and energy loss of fast protons going through plasmas is crucial.As original and final energies of protons are given,density reconstruction by SIRT method is done without noise level of final energies.Accuracy of the method is better than that of the Tikhonov regularization method based on deviation principle of L-curve.In addition,the SIRT method is available with incomplete data.

关 键 词：密度分布 高能质子束 同时迭代重建算法 

分 类 号：O536[理学—等离子体物理]