强激光与固体靶相互作用所致硬X射线剂量的蒙特卡罗模拟

Monte Carlo Simulation on Hard X-ray Dose Produced in Interaction Between High Intensity Laser and Solid Target

本文利用蒙特卡罗程序FLUKA建立了强激光与固体靶相互作用所致硬X射线剂量估算模型,通过与文献结果进行比较,对计算模型进行了验证。利用该计算模型研究了不同电子温度、不同靶材料(包括金、铜和聚乙烯3种常见靶材)和厚度对X射线剂量的影响。计算结果表明,X射线剂量与电子温度密切相关,并会受到靶参数的影响。相同靶厚情形下,Au靶产生的X射线剂量约为Cu靶产生的X射线剂量的1.2倍,约为PE(聚乙烯)产生的X射线剂量的5倍。另外,相较于其他靶厚,当选取电子的平均射程为靶厚时,产生的X射线剂量较大。这些计算结果将为强激光装置中电离辐射剂量的评估提供相关参考。

The X-ray dose produced in the interaction between high intensity laser and solid target was studied by simulation using Monte Carlo code.Compared with experimental results,the calculation model was verified.The calculation model was used to study the effect on X-ray dose with different electron temperatures,target materials(including Au,Cu and PE)and thicknesses.The results indicate that the X-ray dose is mainly determined by the electron temperature,and will be affected by the target parameters.X-ray dose of Au is about 1.2times that of Cu,and is about 5times that of PE(polyethylene).In addition,compared with other target thickness,when target thickness is the mean range of electron in the target,X-ray dose is relatively large.These results will provide references on evaluating the ionizing radiation dose for laser devices.