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    Home > Biochemistry News > Biotechnology News > The research group of Professor Qiao Bin of the School of Physics and collaborators proposed a new scheme for generating a quasi-mono-energetic ion beam driven by a powerful petawatt femtosecond laser

    The research group of Professor Qiao Bin of the School of Physics and collaborators proposed a new scheme for generating a quasi-mono-energetic ion beam driven by a powerful petawatt femtosecond laser

    • Last Update: 2021-11-16
    • Source: Internet
    • Author: User
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    Professor Qiao Bin’s research group and collaborators from the School of Physics of Peking University and the State Key Laboratory of Nuclear Physics and Nuclear Technology proposed to irradiate a micro-tape target with a powerful femtosecond laser to obtain a peak energy higher than 100 MeV and an energy dissipation of 1%.
    A new solution for quality ion beams

    .
    On October 4, 2021, related research results entitled "
    Monoenergetic high-energy ion source via femtosecond laser interacting with a microtape " were published online in " " Physical Review X " ( Physical Review X )
    .

    The high-power laser ion source has an accelerating electric field more than three orders of magnitude higher than the traditional radio frequency source.
    It is expected to realize the miniaturization and commercialization of accelerators.
    It has important application prospects in the fields of fusion energy, medical health, nuclear physics and particle physics

    .
    At present, the highest proton energy obtained in experiments is close to 100 MeV, but its broad spectrum characteristic of exponential decline in its energy spectrum severely limits its application in cancer treatment and other aspects

    .
    In fact, among the many known laser ion acceleration mechanisms, due to the influence of laser conditions and instability, how to obtain a quasi-single-energy ion beam that can meet the medical and clinical requirements of the order of 1% remains unresolved for a long time

    .

    Recently, the research group of Professor Qiao Bin from the School of Physics of Peking University and the State Key Laboratory of Nuclear Physics and Nuclear Technology and the research group of Professor Alexander Pukhov from the Institute of Theoretical Physics of the University of Düsseldorf, Germany, proposed to irradiate microstructures with high-powered femtosecond lasers.
    The tape target obtains the new scheme of high-quality ion beam (pictured)

    .
    The joint research team has precisely designed the micro-tape target so that its surface will excite a strong surface plasmon wave when irradiated by the laser, thereby accelerating the electron resonance, and obtaining a high-energy electron beam with super large charge and super small divergence angle; When injecting into a vacuum, because the amount of electron charge is much greater than the amount of ion charge, a stable pinch electric field is spontaneously formed, which realizes the high-efficiency acceleration of protons while continuously compressing the phase space of protons, and finally obtains a high-quality ion beam with excellent monoenergetics

    .
    The three-dimensional particle simulation results show that by using the existing petawatt femtosecond laser, a high-quality ion (proton) beam with a peak energy higher than 100 MeV and an energy dissipation of 1% can be obtained

    .

    (A) A schematic diagram of a new ion acceleration scheme for the interaction between a petawatt femtosecond laser and a micro-tape target; (b) 3D particle simulation results of proton density; (c) 3D particle simulation results of proton energy spectrum

    Shen Xiaofei, a 2019 PhD graduate from the State Key Laboratory of Nuclear Physics and Nuclear Technology of Peking University and a postdoctoral fellow at the Institute of Theoretical Physics, University of Düsseldorf, is the first author of the paper, and Joe Bin and Alexander Pukhov are the co-corresponding authors
    .
    The above work is supported by the National Natural Science Foundation of China and other projects, which provides a new way for the laser ion acceleration mechanism, which is expected to solve the long-standing problem of ion energy dispersion, and lay the foundation for laser-driven proton therapy for tumors and other applications
    .


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