高驱动能量下微柱阵列增强laser驱动质子加速
Enhancing laser-driven proton acceleration by using micro-pillar arrays at high drive energy
摘要：
微米和纳米结构靶表面与高功率激光脉冲的相互作用因其前所未有的吸收效率而受到广泛研究。我们研制了用于激光驱动质子加速实验的垂直排列金属微柱阵列。我们表明，这样的目标有助于加强相互作用机制时，照射强度$\sim$ $10^{17-18}$ W/cm $^2$的高能量级激光脉冲。与标准的平面靶相比，我们见证了强烈增强的热电子产生和质子加速的最大能量和粒子数。支持我们的实验结果，二维粒子细胞模拟表明，增加激光能量转换成热电子，导致更强的加速场。这为激光驱动离子加速系统的进一步改进打开了机会之窗。
英文摘要：
The interaction of micro- and nano-structured target surfaces with high-power laser pulses is being widely investigated for its unprecedented absorption efficiency. We have developed vertically aligned metallic micro-pillar arrays for laser-driven proton acceleration experiments. We demonstrate that such targets help strengthen interaction mechanisms when irradiated with high-energy-class laser pulses of intensities $\sim$ $10^{17-18}$ W/cm$^2$. In comparison with standard planar targets, we witness strongly enhanced hot-electron production and proton acceleration both in terms of maximum energies and particle numbers. Supporting our experimental results, two-dimensional particle-in-cell simulations show an increase in laser energy conversion into hot electrons, leading to stronger acceleration fields. This opens a window of opportunity for further improvements of laser-driven ion acceleration systems.
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