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为了研究激光辐射压驱动的运动电场中加速质子的相关问题,对强激光与等离子体相互作用过程进行了理论分析,并采用2维粒子模拟方法,对理论分析结果进行了数值模拟验证。结果表明,当超短超强激光脉冲与处在背景等离子体前方的薄固体平靶相互作用时,在固体靶后部形成一个由电子层-离子层组成的双层结构,在激光辐射压的不断推进下,双层结构在背景等离子体里以一定速度传播形成一个运动电场;在背景等离子体中的质子被这个运动电场捕获并能加速到很高的能量,质子的最大能量达到20GeV。理论分析结果与2维粒子模拟结果符合得很好。
In order to study the related problems of accelerating protons in the moving electric field driven by laser radiation, the interaction between intense laser and plasma was theoretically analyzed and the theoretical analysis was verified by numerical simulation using 2-D particle simulation method. The results show that when the ultrashort superlattice laser pulse interacts with the thin solid target in front of the background plasma, a double layer structure consisting of the electron-ion layer forms at the back of the solid target. Under the laser radiation pressure Under the constant progress, the double-layer structure propagates in the background plasma at a constant velocity to form a moving electric field. The protons in the background plasma are captured by the moving electric field and accelerated to very high energies, and the maximum energy of the protons reaches 20 GeV. The theoretical analysis results are in good agreement with the 2D particle simulation results.