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实验研究了超强激光与平面薄膜Cu靶的相互作用中,在靶背法线方向产生的离子能量分布.实验中采用固体核径迹探测器CR39和Thomson谱仪相结合测量离子能谱.实验中同时测量到了质子和C4+、C3+、C2+和C1+离子.实验结果表明:离子沿着靶背法线方向发射,离子在一定能量处出现截断；在固体核径迹探测器CR39上可以看出碳离子信号比质子信号弱,质子的产额远高于碳离子,质子对碳离子有屏蔽作用；在相同发次中C4+、C3+、C2+和C1+离子随着荷质比的增大,相应离子的截止能增加.

The energy spectrum of ions generated by ultra-high laser and plane film copper target interaction

In the experiment of ultra-intense laser interaction with plane film copper target, ions spectrum are studied at the target rear-side normal direction. The solid nuclear detector CR39 and Thomson spectrum are used to detect the energy spectrum of protons and carbon ions. Protons and C⁴⁺, C³⁺, C²⁺ and C¹⁺ ions have been observed. In addition, the results show that the ions are cut-off at a certain energy. Moreover, the carbon ions traces are very weaker than the protons trace, so the yields of proton is much higher than carbon ions, and the protons have some screening effect on the carbon ions. And the cut-off energy of the carbon ion is increased with the charge-to-mass ratio in the same shot.