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研究了激光辐射压驱动的两级质子加速的相关问题。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电子层-离子层组成的双层结构。在激光的不断推进下,双层结构在背景等离子体里以一定速度传播,可以看成运动在背景等离子体中的电场。这样,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。通过二维PIC模拟方法和理论分析研究了质子加速的相关问题。研究结果表明,被加速质子的最大能量达到20GeV。
The related problems of two-stage proton acceleration driven by laser radiation are studied. When the ultrashort superlattice laser pulse interacts with a thin solid flat target in front of the background plasma, a double-layered structure of electron-ion layers forms behind the solid target. Under the continuous advance of the laser, the double-layer structure propagates in the background plasma at a certain speed and can be regarded as the electric field of the background plasma in motion. In this way, protons in the background plasma are captured by this moving electric field and accelerated to very high energies. The related problems of proton acceleration are studied by two-dimensional PIC simulation and theoretical analysis. The results show that the maximum energy of accelerated protons reaches 20GeV.