三维柱腔内辐射输运的一维模拟

在惯性约束聚变实验中,使用一维辐射流体力学程序模拟辐射在管壁约束的介质中的传输,因为无法考虑管壁辐射漏失等二维或三维边缘效应而引入了较大的误差.通过解析的视角因子公式和反照率定标公式来模拟X射线在管壁中的损失以及腔壁开口的漏失等边缘效应,对一维辐射流体力学程序MULTI的辐射输运计算进行了修改,成功模拟了X射线辐照下金等离子体的界面运动轨迹,比不考虑边缘漏失更接近实验测量结果,证明了该方法的有效性.

One-dimensional simulation of radiation transport in three-dimensional cylinder

In indirect driven inertial confinement fusion experiments, one-dimensional radiation hydrodynamics code is used to simulate radiation transport in material confined in a cylinder and large bias is generated due to two- or three-dimensional lateral effects like energy losses into the cylinder wall. Lateral X-ray radiation losses such as cylinder wall loss and direct leak from the detection holes are simulated through analytical view factor equations and albedo power laws. Modifications are made for a one-dimensional radiation hydrodynamics code MULTI which is successfully used in the simulation of measured hydrodynamic trajectory of X-ray-heated gold plasma and better result is obtained than without taking lateral effect into account, which proves that this modification is practical.