超短脉冲超强激光与固体靶相互作用中高能离子的产生
Energetic ions generation in the interaction between ultrashort ultraintense laser pulse and solid target
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摘要: 用2D3V PIC粒子模拟方法得到了超短脉冲超强激光与固体靶相互作用中高能离子产生的图像，并对其机理进行了研究。在靶前后表面都观察到了高能离子的产生，并诊断了离子能谱。模拟结果表明，在靶前表面所产生的高能离子，角分布较大，在向靶内输运过程中会损失能量；在靶后表面产生的高能离子，定向性很好，能获得很高的能量。模拟得到的离子能量和实验观测结果在量级上相符。Abstract: Energetic ions generated from a solid target irradiated normally by an ultrashort ultraintense laser pulse is examined by 2D3V particle-in-cell simulations. The energetic ions are observed from both the front and the rear of the target. The ions energy spectra are obtained. The simulation results show that the energetic ions from the front of the target have a rather larger angular distribution, and deposit energy in the target, while the energetic ions from the rear target surface are highly directed and are accelerated to higher energy. The ion energy from the simulation is consistent with that observed in experiments.
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