Generation of monoenergetic proton beams by a combined scheme with an overdense hydrocarbon target and an underdense plasma gas irradiated by ultra-intense laser pulse
Generation of monoenergetic proton beams by a combined scheme with an overdense hydrocarbon target and an underdense plasma gas irradiated by ultra-intense laser pulse
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DOI：
10.1017/s0263034614000561
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发表时间：
2014-12
影响因子：
0.9
通讯作者：
W. Yao;Baiwen Li;Lihua Cao;Fan-fan Zheng;Taiwu Huang;C. Xiao;M. Škorić
中科院分区：
文献类型：
--
作者：
W. Yao;Baiwen Li;Lihua Cao;Fan-fan Zheng;Taiwu Huang;C. Xiao;M. Škorić
提出了一种利用超高密度碳氢靶和低密度等离子体气体在超强激光脉冲作用下产生单能质子束的优化方案。该方案基于辐射压加速机制和激光韦克菲尔德加速机制的结合，并通过一维相对论粒子模拟（1D PIC）进行了验证。与纯氢靶相比，由于重碳原子的存在，碳氢靶中的质子可以被预加速到更高的能量并在空间中被压缩，这为欠密等离子体气体中的连续激光韦克菲尔德加速提供了更好的注入过程，从而产生了单能的数十GeV质子束。此外，第一次发现，与使用纯H靶相比，使用碳氢化合物靶可以降低对激光强度的要求，以在该组合方案中产生具有相同能量的质子束。
An optimization scheme for the generation of monoenergetic proton beams by using an overdense hydrocarbon target, followed by an underdense plasma gas, irradiated by an ultra-intense laser pulse is presented. The scheme is based on a combination of a radiation pressure acceleration mechanism and a laser wakefield acceleration mechanism, and is verified by one-dimensional relativistic particle-in-cell (1D PIC) simulations. As compared to the pure hydrogen (H) target, protons in the hydrocarbon target can be pre-accelerated to higher energy and compressed in space due to the existence of the heavy carbon atoms, which provides a better injection process for the successive laser wakefield acceleration in the underdense plasma gas, resulting in the generation of a monoenergetic, tens-of-GeV proton beam. Additionally, for the first time, it is found that the use of the hydrocarbon target can reduce the requirement for laser intensity to generate proton beams with the same energy in this combined scheme, as compared to the use of the pure H target.