采用沟槽型碳氢靶增强靶背法向鞘层加速
Enhanced target normal sheath acceleration with a grooved hydrocarbon target
AI总结：
本研究通过二维PIC模拟探究不同形状微米级沟槽的碳氢靶对激光质子加速的影响，发现矩形沟槽靶可使质子截止能量提升约4倍并显著降低角发散度，为靶背法向鞘层加速的性能优化提供了有效方案。
摘要：
已知高强度超短激光脉冲与数微米厚碳氢靶相互作用时，会通过靶背法向鞘层加速机制在靶背侧将质子/离子加速至多MeV量级。对靶前表面进行微结构化处理是提升加速质子/离子的截止能量并降低其发散度的可行途径之一。本文采用二维粒子模拟（PIC）方法，研究了正入射强激光脉冲与前表面带有单个微米级沟槽的靶的相互作用，沟槽形状分别为半圆形、三角形和矩形。研究发现，与平面靶相比，前表面带有矩形沟槽的靶可在靶背侧形成聚焦的热电子束，使加速质子的截止能量提升约4倍；三角形和半圆形沟槽靶的截止能量相对更低，但仍高于平面靶。此外，矩形沟槽靶情况下，加速质子/离子的角发散度也明显更低。
英文摘要：
The interaction of a high-intensity ultrashort laser pulse with a few microns-thick hydrocarbon target is known to accelerate protons/ions to multi-MeV, on the rear side of the target, via the mechanism of target normal sheath acceleration. Micro-structuring the target front is one of the promising approaches to enhance the cut-off energy as well as to reduce the divergence of accelerated protons/ions. In this paper, the interaction of a normally incident intense laser pulse with targets having single micron-sized grooves, at their front side, of semi-circular, triangular, and rectangular shapes has been studied by using two-dimensional Particle-In-Cell (PIC) simulations. It is observed that as compared to a flat target for targets with a rectangular groove at the front side the focused hot electron beam at the rear side results in an approximately four-fold increase in the cut-off energy of accelerated protons. For triangular and semi-circular groove targets, the cut-off energy remains comparatively lower (higher than the flat target though). The angular divergence of the accelerated protons/ions is also found to be relatively much lower in the case of a rectangular groove.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
