【摘要】 为了得到激光与等离子体相互作用过程中产生的高能离子的能量谱,采用动力学的方法,对描述各向同性分布的带电粒子的扩散方程——Fokker-Planck 方程进行求解,分析了激光等离子体中朗缪尔等离激元对离子的加速以及不同的朗缪尔波湍动谱对实现离子加速的影响。理论得到的高能离子的能量谱呈指数形式衰减;从图像中可以看出,在高能量区域这种指数形式的离子能谱能够跟实验观测的离子能谱很好地吻合。结果表明,朗缪尔等离激元对离子加速的过程中离子加速的实现对朗缪尔波谱的形式有很强的依赖性,只有 Kolmogorov 谱对离子加速是有效的。更多还原

【Abstract】 In order to obtain the energy spectrum of high power ions in the interaction between laser and plasma,the Fokker-Planck equation,describing the isotropic electric particles,was solved. Then the effect of Langmuir plasmons in laser plasma and Langmuir turbulence spectrum on the ion acceleration was analyzed. The analytical results conformed to the experimental one and the energy spectrum attenuated exponentially. The results show that the realization of ion acceleration exist a great dependence on the style of Langmuir spectrum and only the Kolmogorov-type power-law spectrum is effective for ion acceleration.更多还原