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为了探索飞秒脉冲激光与固体靶相互作用中高能离子的能量分布特性,在超短超强激光装置“SILEX-I”上进行了超强激光与平面薄膜Cu靶的相互作用中高能离子能谱分布的实验研究。采用固体核径迹探测器CR39和Thomson离子谱仪相结合的方式,在固体靶背表面法线方向测量了质子和C离子能量分布和产额。结果显示,同时测量到了H+质子和C1+、C2+、C3+和C4+信号,离子沿靶背法线方向发射,离子出现能量截断,离子的截止能量之比为1∶2∶3∶4。在CR39上质子信号比C离子信号强,质子产额远高于C离子产额;在同一发打靶中,C1+、C2+、C3+和C4+随着荷质比的减小,相应的离子的截止能量也在减小。这一结果将为惯性约束聚变(ICF)“快点火”方案的可行性分析提供参考依据。
In order to explore the energy distribution characteristics of high energy ions in the interaction between femtosecond pulsed laser and solid target, the interaction between the superlattice laser and the planar thin film Cu target was performed on the ultra-short super laser device “SILEX-I” Experimental Study on Spectrum Distribution. The energy distribution and yield of proton and C ions were measured in the normal direction of the solid target back surface by the combination of solid nuclear track detector CR39 and Thomson ion spectrometer. The results show that H + protons and C1 +, C2 +, C3 + and C4 + signals are measured at the same time. The ions are emitted along the normal direction of the target backbones. The energy of the ions is truncated and the ratio of the cutoff energy of the ions is 1: 2: 3: 4. In CR39, the proton signal is stronger than the C ion signal, and the proton yield is far higher than the C ion yield. In the same attacking target, the cut-off energy of the corresponding ions also decreases with the decrease of the charge-to-mass ratio of C1 +, C2 +, C3 + and C4 + Is decreasing This result will provide a reference for the feasibility analysis of the ICF / FAST program.