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激光在次稠密等离子中传输,由于频率下移而被俘获,从而产生电磁孤立子.根据先前理论及PIC模拟给出的孤立子的演化过程,对不同阶段孤立子的电磁场分布进行了建模.使用Geant4蒙特卡罗程序,模拟研究了激光加速产生的能量为几个MeV的质子束对后孤立子的照相.分析了质子能量,质子源尺寸等因素对照相结果的影响,并利用了TNSA加速产生质子束的分幅特性,开展了时间分辨的孤立子照相模拟研究.模拟给出的质子照相结果验证了文献中给出的孤立子静电场模型,为以后在实验上探测孤立子提供了理论依据.
The laser is transmitted in sub-dense plasma and is trapped due to the frequency shift, resulting in electromagnetic solitons. Based on the previous theory and the evolution of solitons given by PIC simulations, the electromagnetic field distributions of solitons in different stages are modeled. Using the Geant4 Monte Carlo simulation, we studied the photon generation of a post-soliton by several MeV proton beams generated by laser acceleration.The influence of proton energy, proton source size and other factors on the photographic results was analyzed and TNSA acceleration And the time-resolved soliton photogrammetric simulation was carried out.The proton-photon simulation results validated the soliton electrostatic field model given in the literature and provided a theoretical basis for the later experimental exploration of solitons in accordance with.