Spatial distribution modulation of laser-accelerated charged particles with micro-tube structures

Q. S. Wang, C. Y. Qin,H. Zhang,S. Li, A. X. Li,N. W. Wang, X. M. Lu, J. F. Li, R. J. Xu,C. Wang, X. Y. Liang,Y. X. Leng, B. F. Shen,L. L. Ji

PHYSICS OF PLASMAS(2023)

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摘要
We present experimental studies on the spatial distribution of charged particles using a linearly polarized femtosecond laser interacting with a micro-structure target composed of micro-tube structure and planar foil. For protons, a six-lobed structure was observed in the low-energy region, while a smaller angular divergence was measured in the high-energy region. Electron distribution exhibits a circular distribution at low energies and double-lobed structure at high energies. These results are well reproduced by 3D particle-in-cell simulations, showing that the profile of electrons driven by a laser pulse is manipulated by the micro-tube structure, which maps into the spatial distribution of protons via a strong charge separation field. These results demonstrate the effect of micro-structures on laser-driven particle sources and provide a possible approach for spatial manipulation of the particle beams.
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关键词
particles,laser-accelerated,micro-tube
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