Enhanced laser-radiation-pressure-driven proton acceleration by moving focusing electric-fields in a foil-in-cone target
Enhanced laser-radiation-pressure-driven proton acceleration by moving focusing electric-fields in a foil-in-cone target
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DOI：
10.1063/1.4908552
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发表时间：
2015-02
影响因子：
2.2
通讯作者：
D. Zou;H. Zhuo;T. Yu;H. C. Wu;X. Yang;F. Shao;Yanxing Ma;Y. Yin;Z. Ge
中科院分区：
文献类型：
--
作者：
D. Zou;H. Zhuo;T. Yu;H. C. Wu;X. Yang;F. Shao;Yanxing Ma;Y. Yin;Z. Ge
提出了一种锥中箔靶结构，以提高激光辐射压驱动质子加速的稳定性，避免加速过程中的束流退化。二维和三维粒子模拟表明，引导锥可以大大提高离子束的光谱和空间特性，并导致更好地保持束流质量。这可以归因于在锥体的内壁上形成的径向鞘电场的聚焦效应，其与加速的箔片共同移动并且有效地抑制箔片的不期望的横向爆炸。结果表明，采用强度为<$2.74 × 1022 W scincm ~ 2的横向高斯脉冲，可以获得峰值能量为<$1.5GeV/u、密度为<$10nc、横向尺寸为<$1 λ0的准单能质子束。
A foil-in-cone target is proposed to enhance stable laser-radiation-pressure-driven proton acceleration by avoiding the beam degradation in whole stage of acceleration. Two and three-dimensional particle-in-cell simulations demonstrate that the guiding cone can substantially improve the spectral and spatial properties of the ion beam and lead to better preservation of the beam quality. This can be attributed to the focusing effect of the radial sheath electric fields formed on the inner walls of the cone, which co-move with the accelerated foil and effectively suppress the undesirable transverse explosion of the foil. It is shown that, by using a transversely Gaussian laser pulse with intensity of ∼2.74 × 1022 W∕cm2, a quasi-monoenergetic proton beam with a peak energy of ∼1.5 GeV/u, density ∼10nc, and transverse size ∼1λ0 can be obtained.