超短超强激光与等离子体相互作用中产生的高能质子在激光惯性约束核聚变、新型台面质子加速器以及医学等研究领域已成为广泛关注的热点。超强激光与等离子体相互作用中密度标长对超热电子或高能质子加速影响很大,所以为了确定超热电子或高能质子的加速机制,需要确定等离子体的密度标长。利用粒子模型(PIC)法得到的模拟结果研究了超强激光与等离子体相互作用中高能质子产生的物理机制以及前表面等离子体密度标长对超热电子或高能质子加速的影响。 High-energy protons generated during the interaction between ultrashort superlattice laser and plasma have become the hot topics of interest in laser inertial confinement fusion, new mesa accelerator and medical research fields. Intensity Laser Interaction with plasma Density gauge length has a great influence on the acceleration of superheated electrons or high-energy protons. Therefore, in order to determine the accelerating mechanism of hot electrons or high-energy protons, the plasma density scale length needs to be determined. Based on the simulation results obtained by the particle model (PIC) method, the physical mechanism of high-energy proton generation in the interaction between the superlaser laser and the plasma and the effect of the front surface plasma density on the super-hot electron or high-energy proton acceleration are studied.