Distribution uniformity of laser-accelerated proton beams

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Jun-Gao Zhu, Kun Zhu, Li Tao, Xiao-Han Xu, Chen Lin, Wen-Jun Ma, Hai-Yang Lu, Yan-Ying Zhao, Yuan-Rong Lu, Jia-Er Chen and Xue-Qing Yan. Distribution uniformity of laser-accelerated proton beams[J]. Chinese Physics C, 2017, 41(9): 097001. doi: 10.1088/1674-1137/41/9/097001
Jun-Gao Zhu, Kun Zhu, Li Tao, Xiao-Han Xu, Chen Lin, Wen-Jun Ma, Hai-Yang Lu, Yan-Ying Zhao, Yuan-Rong Lu, Jia-Er Chen and Xue-Qing Yan. Distribution uniformity of laser-accelerated proton beams[J]. Chinese Physics C, 2017, 41(9): 097001.  doi: 10.1088/1674-1137/41/9/097001 shu
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Received: 2017-02-14
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    Supported by National Natural Science Foundation of China (11575011, 61631001) and National Grand Instrument Project (2012YQ030142)

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Distribution uniformity of laser-accelerated proton beams

    Corresponding author: Kun Zhu,
    Corresponding author: Xue-Qing Yan,
  • 1. State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
Fund Project:  Supported by National Natural Science Foundation of China (11575011, 61631001) and National Grand Instrument Project (2012YQ030142)

Abstract: Compared with conventional accelerators, laser plasma accelerators can generate high energy ions at a greatly reduced scale, due to their TV/m acceleration gradient. A compact laser plasma accelerator (CLAPA) has been built at the Institute of Heavy Ion Physics at Peking University. It will be used for applied research like biological irradiation, astrophysics simulations, etc. A beamline system with multiple quadrupoles and an analyzing magnet for laser-accelerated ions is proposed here. Since laser-accelerated ion beams have broad energy spectra and large angular divergence, the parameters (beam waist position in the Y direction, beam line layout, drift distance, magnet angles etc.) of the beamline system are carefully designed and optimised to obtain a radially symmetric proton distribution at the irradiation platform. Requirements of energy selection and differences in focusing or defocusing in application systems greatly influence the evolution of proton distributions. With optimal parameters, radially symmetric proton distributions can be achieved and protons with different energy spread within ±5% have similar transverse areas at the experiment target.

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