Energy-chirp compensation of laser-driven ion beams enabled by structured targets
Energy-chirp compensation of laser-driven ion beams enabled by structured targets
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DOI：
10.1103/physrevresearch.4.l042031
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发表时间：
2018-07
影响因子：
4.2
通讯作者：
Z. Gong;S. Bulanov;T. Toncian;A. Arefiev
中科院分区：
文献类型：
--
作者：
Z. Gong;S. Bulanov;T. Toncian;A. Arefiev
我们表明，使用3D模拟，产生密集的单能激光驱动的离子束与低角发散的挑战，可以克服利用结构化的目标与相对论透明的通道和过密壁。与产生啁啾离子束的均匀靶相比，靶结构有利于形成密集的电子束团，其纵向电场反转能量啁啾。这种方法与现有的加速机制结合使用，增强了离子谱。例如，我们的3D模拟预测峰值强度为5 × 10 22 W/cm 2的2 PW激光脉冲的显著改善。模拟显示了在200 MeV的高度期望的能量范围内的单能质子峰，具有几nC的前所未有的电荷和低于10 μ m的相对低的发散度。
We show using 3D simulations that the challenge of generating dense mono-energetic laser-driven ion beams with low angular divergence can be overcome by utilizing structured targets with a relativistically transparent channel and an overdense wall. In contrast to a uniform target that produces a chirped ion beam, the target structure facilitates formation of a dense electron bunch whose longitudinal electric field reverses the energy chirp. This approach works in conjunction with existing acceleration mechanisms, augmenting the ion spectra. For example, our 3D simulations predict a significant improvement for a 2 PW laser pulse with a peak intensity of 5 × 10 22 W/cm 2 . The simulations show a mono-energetic proton peak in a highly desirable energy range of 200 MeV with an unprecedented charge of several nC and relatively low divergence that is below 10 ◦ .