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发散角过大是制约超强激光与固体靶相互作用加速产生高能质子束应用的一个重大物理难题.本文提出了一种结构化的通道靶型,与超强激光相互作用可提高质子束的发散特性,通道壁上产生的横向电荷分离静电场可对质子有效聚焦.采用二维particle-in-cell粒子模拟程序对激光通道靶相互作用过程进行了研究,分析了加速质子束的性能特点.模拟结果表明,与传统平面靶相比,通道靶可以在不过多损失能量的情况下产生具有更好准直性的质子束,尤其当通道靶的直径与激光焦斑尺寸和质子源尺寸相当时,横向静电场能够有效聚焦质子束,并且可保证相对较高的激光能量利用率.
Excessive divergence angle is a major physical problem restricting the interaction between superlattice laser and solid target to accelerate the application of high-energy proton beam.This paper presents a structured channel target type, which interacts with superlattice laser to increase the divergence of proton beam Characteristics, the lateral charge separation electrostatic field generated on the wall of the channel can effectively focus on the proton.The process of laser channel target interaction is studied by using two-dimensional particle-in-cell particle simulation program, and the performance characteristics of accelerated proton beam are analyzed. The results show that compared with the traditional planar target, the channel target can produce proton beam with better collimation without losing much energy, especially when the diameter of channel target is equal to the laser focal spot size and proton source size, The lateral electrostatic field effectively focuses the proton beam and ensures relatively high laser energy utilization.