高能质子束在激光等离子体中传输的粒子模拟  

Particle Simulation of Energetic Proton Beam Propagating in Laser Plasma Interaction

作　　者：阿不都热苏力 

机构地区：[1]新疆大学物理科学与技术学院,新疆乌鲁木齐830046

出　　处：《激光与光电子学进展》2015年第7期159-164,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(11465019;11164030)

摘　　要：用二维相对论粒子模拟程序(2D-PIC)对强激光与高密度等离子体相互作用中产生的高能质子束及其传播特性进行数值模拟。数值模拟结果表明:密度梯度标长对质子能谱的影响至关重要,增大密度梯度标长厚度,靶后静电场增强,质子的最大能量显著增大;密度梯度标长对从薄靶出射的高能质子束有一定的约束作用,高能质子的加速、准直和发散强烈地依赖于强激光与等离子体之间的空间耦合。The generation of high energetic proton beams and propagation characteristics in laser-plasma interaction is simulated by two-dimensional relativistic electromagnetic particle-in-cell simulation code （2D-PIC）. The results show that the density gradient scale length thickness is crucial to the proton energy spectrum. The quasi-static electric field becomes stronger as increasing the density gradient scale length, which results in the enhancement of the maximum proton energy. Density gradient scale length affects highenergy proton beam emitted from thin target by certain constraints. The collimation and the beam divergence of the accelerated protons are expected to strongly depend on the spatial coupling between the laser pulse and the target plasma.

关 键 词：激光光学 强激光与等离子体 高能质子束 密度梯度标长 粒子模拟方法 发散角 

分 类 号：O531[理学—等离子体物理] O434[理学—物理]