Boosted acceleration of protons by tailored ultra-thin foil targets
Boosted acceleration of protons by tailored ultra-thin foil targets
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DOI：
10.1038/s41598-019-55011-2
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发表时间：
2019-12-10
影响因子：
4.6
通讯作者：
Aurand, Bastian
中科院分区：
文献类型：
--
作者：
Kaymak, Vural;Aktan, Esin;Aurand, Bastian
我们报告了利用多焦耳短脉冲激光系统对超薄半球形靶中质子加速的详细实验和数值研究。当激光强度为1 × 10(20) W/cm(2)，靶上能量仅为1.3 J时，质子截止能量达到8.5 MeV，比相同厚度的平面箔靶高1.8倍。虽然以前在高能激光系统中观察到通过额外注入电子来促进复杂目标的加速过程，但我们的研究表明，该过程可以在强度上至少使用两个数量级，因此适用于目前大量现有的激光系统。我们获得了每焦耳入射激光能量约6.5 MeV的质子能量的截止能量，这与使用该机制的先前结果相比有明显的增强。本文提出的方法具有使用结构简单目标的优点，并且可以同时用于大量应用和高重复率需求。
We report on a detailed experimental and numerical study on the boosted acceleration of protons from ultra-thin hemispherical targets utilizing multi-Joule short-pulse laser-systems. For a laser intensity of 1 x 10(20) W/cm(2) and an on-target energy of only 1.3 J with this setup a proton cut-off energy of 8.5 MeV was achieved, which is a factor of 1.8 higher compared to a flat foil target of the same thickness. While a boost of the acceleration process by additionally injected electrons was observed for sophisticated targets at high-energy laser-systems before, our studies reveal that the process can be utilized over at least two orders of magnitude in intensity and is therefore suitable for a large number of nowadays existing laser-systems. We retrieved a cut-off energy of about 6.5 MeV of proton energy per Joule of incident laser energy, which is a noticeable enhancement with respect to previous results employing this mechanism. The approach presented here has the advantage of using structure-wise simple targets and being sustainable for numerous applications and high repetition rate demands at the same time.