Laser crossing-beam energy transfer model based on ray-tracing method
-
摘要: 提出一种基于几何光路追踪方法并可在流体模拟程序中实现在线计算的激光交叉束能量转移(CBET)耦合模型。借助由激光逆轫致吸收公式引入的泵浦激光功率密度在流体网格尺度上的计算公式,该模型可计算探针激光束中每根光线所携带的能量经过与泵浦激光场相互作用带来的损失(或增加),从而实现激光能量在束间的转移。反复迭代的计算方法解决了由于激光束间能量转移与光线历史相关并且束间强耦合带来的方程求解困难。模型很容易推广到多束激光束两两能量交换的情形,也可用于研究逆轫致吸收和激光等离子体相互作用等物理内容。
-
关键词:
- 间接驱动惯性约束聚变 /
- 激光靶耦合 /
- 交叉束能量转移 /
- 几何光路追踪 /
- 在线耦合计算
Abstract: A new ray-based model of crossing-beam energy transfer (CBET) is developed. This model can be used in dynamic kinetic codes for evaluating CBET in line. By defining laser intensity in grid through inverse bremsstrahlung absorption formula of laser, every single ray of probe laser beam can obtain (or lose) energy from the intensity of pump laser beam. Since CBET is dependent on the history of every single laser ray and the coupling between probe laser and pump laser is strong, the coupling equations are difficult to be solved. Calculating iteratively can solve the problem well. This in-line CBET model can be generalized to the situation where there are energy transfers among three or more laser beams easily. Inverse bremsstrahlung absorption and laser plasma interaction could also be involved in the model.
点击查看大图
计量
- 文章访问数: 1509
- HTML全文浏览量: 255
- PDF下载量: 412
- 被引次数: 0