Simulations of stable compact proton beam acceleration from a two-ion-species ultrathin foil
Simulations of stable compact proton beam acceleration from a two-ion-species ultrathin foil
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DOI：
10.1063/1.3574351
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发表时间：
2011-03
影响因子：
2.2
通讯作者：
T. Yu;A. Pukhov;G. Shvets;M. Chen;T. H. Ratliff;S. Yi;V. Khudik
中科院分区：
文献类型：
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作者：
T. Yu;A. Pukhov;G. Shvets;M. Chen;T. H. Ratliff;S. Yi;V. Khudik
我们报道了由两种离子组成的超薄薄膜的稳定激光驱动的质子加速：较重的碳离子和较轻的质子。多维粒子胞内模拟表明，辐射压力导致物种在空间上非常快速和完全的分离。激光脉冲不会穿透碳离子层，避免了质子瑞利-泰勒(RT)式的不稳定性。最终，碳离子被加热并在太空中广泛扩散。相比之下，质子总是坐在碳离子云的前面，形成一个紧凑的高质量束团。我们引入了一个简单的三界面模型来解释质子层中的不稳定性抑制。该模型得到了各种复合箔的模拟支持，例如碳氚和碳氚复合箔。还研究了碳离子的荷电状态对质子加速的影响。结果表明，随着碳离子电荷态的降低，类RT不稳定性和库仑爆炸都发生了变化。
We report stable laser-driven proton beam acceleration from ultrathin foils consisting of two ion species: heavier carbon ions and lighter protons. Multidimensional particle-in-cell simulations show that the radiation pressure leads to very fast and complete spatial separation of the species. The laser pulse does not penetrate the carbon ion layer, avoiding the proton Rayleigh–Taylor (RT)-like instability. Ultimately, the carbon ions are heated and spread extensively in space. In contrast, protons always ride on the front of the carbon ion cloud, forming a compact high quality bunch. We introduce a simple three-interface model to interpret the instability suppression in the proton layer. The model is backed by simulations of various compound foils such as carbon–deuterium and carbon–tritium foils. The effects of the carbon ions’ charge state on proton acceleration are also investigated. It is shown that with the decrease of the carbon ion charge state, both the RT-like instability and the Coulomb explosio...