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为了探索飞秒激光与固体靶相互作用中高能离子的产生和加速机制,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。实验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。实验结果表明,实验观察到了质子和C4+、C3+、C2+和C1+离子信号;离子沿着靶背法线方向发射,离子在一定能量处出现截断;质子和C4+、C3+、C2+及C1+离子的截止能分别是1 221和1 941keV、1 899、624、422keV;随着C离子电荷数增加,产额也随着增加;质子的产额远远高于C离子。经分析,高能离子的产生和加速是多种作用机制共同作用的结果,其中静电场中的靶后鞘层加速(TNSA)机制则占主导地位。
In order to explore the mechanism of the generation and acceleration of high energy ions in the interaction between femtosecond laser and solid target, the interaction between the superlattice laser and the Cu thin film target in the ultra-short super laser device “SILEX-I” Experimental Study on Spectrum Distribution. The experiment uses the combination of solid nuclear track detector CR39 and Thomson ion spectrometer to measure the proton and C ion energy distribution and yield in the normal direction of the solid target back surface. The experimental results show that the proton and C4 +, C3 +, C2 + and C1 + ions are observed in the experiment. The ions are emitted along the normal direction of the target and the ions are truncated at a certain energy. The cutoff energies of protons and C4 +, C3 +, C2 + and C1 + ions Respectively, 1 221 and 1 941 keV, 1 899 624 and 422 keV. With the increase of C ion charge, the yield also increased. The proton yield was much higher than that of C ion. After analysis, the generation and acceleration of high-energy ions are the result of multiple mechanisms of action, of which the TNSA mechanism in the electrostatic field dominates.