利用光核反应对激光等离子体中超热电子温度诊断的理论研究

摘要

The temperature of hot electrons produced in ultra-short ultra-intense laser-plasma interactions could be measured by photonuclear diagnostic method. In this paper, the process of bremsstrahlung gamma photons generated by hot electrons interacting separately with 63Cu, 107Ag, and 12C, were simulated using the Monte Carlo N-particle transport code (MCNP). According to the different cross-sections, the activities of different samples were calculated. The activity ratios for 11C/62Cu and11C/106Ag were achieved at different electron temperatures. This method can realize the temperature diagnostic of hot electrons in laser-plasma interactions.%　　超短超强激光与等离子体相互作用可以产生高能的超热电子,利用光核反应的方法可以对这部分超热电子的温度进行诊断。本文通过粒子输运程序(MCNP),模拟了超热电子通过轫致辐射产生γ光子,γ光子再分别与63Cu,107Ag,12C等活化材料发生光核反应的物理模型,并根据核素的活化截面数据,计算了不同活化片的放射性活度,得到了11C/62Cu,11C/106Ag活度比与电子温度关系曲线,采用理论模拟的方法实现了激光等离子体产生的超热电子的温度诊断。