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非线性啁啾频率对势阱产生正负电子对的增强

王莉 李烈娟 麦丽开·麦提斯迪克 谢柏松

王莉, 李烈娟, 麦丽开·麦提斯迪克, 等. 非线性啁啾频率对势阱产生正负电子对的增强[J]. 强激光与粒子束. doi: 10.11884/HPLPB202234.220066
引用本文: 王莉, 李烈娟, 麦丽开·麦提斯迪克, 等. 非线性啁啾频率对势阱产生正负电子对的增强[J]. 强激光与粒子束. doi: 10.11884/HPLPB202234.220066
Wang Li, Li Liejuan, Melike Mohamedsedik, et al. Enhancement of nonlinear chirped frequency on electron-positron pair production in the potential well[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202234.220066
Citation: Wang Li, Li Liejuan, Melike Mohamedsedik, et al. Enhancement of nonlinear chirped frequency on electron-positron pair production in the potential well[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202234.220066

非线性啁啾频率对势阱产生正负电子对的增强

doi: 10.11884/HPLPB202234.220066
基金项目: 国家自然科学基金项目(11875007,11935008);北京市科学技术研究院改革与发展项目(13001-2114)
详细信息
    作者简介:

    王莉:王 莉,201731220001@mail.bnu.edu.cn

    通讯作者:

    谢柏松,bsxie@bnu.edu.cn

  • 中图分类号: O413

Enhancement of nonlinear chirped frequency on electron-positron pair production in the potential well

  • 摘要: 用计算量子场论方法研究了非线性啁啾频率对势阱中正负电子对产生的增强效应。研究了由静态势阱和动态势阱组成的组合势阱中产生的正负电子对的密度、产额和能谱等性质随着啁啾参数的变化,分析了组合势阱的频谱和瞬时束缚态。发现非线性啁啾效应对低频区域比较敏感,与固定频率情况相比可以使粒子数增加2~3倍。与组合势阱相比,非线性啁啾效应对单个振荡势阱更敏感。在低频下单个振荡的势阱中正负电子对产额可提高多个数量级。这是因为在低频下单个振荡的势阱中,主要通过量子隧穿过程产生的正负电子对数目非常低。非线性啁啾效应增加了高频场成分,提高了多光子过程和动力学辅助机制。由于高频抑制作用,所以非线性啁啾效应对高频区域粒子的增量不大,甚至会抑制正负电子对的产生。
  • 图  1  单个振荡势阱下正负电子对的数目与啁啾参数的依赖关系

    Figure  1.  Electron-positron number vs the chirp parameter in a single oscillating potential well

    图  2  单个振荡势阱下最优啁啾参数与基频的依赖关系

    Figure  2.  Optimal chirp parameter vs fundamental frequency in a single oscillating potential well

    图  3  单个振荡势阱下正负电子对数目随基频变化

    Figure  3.  Electron-positron pair number vs fundamental frequency in a single oscillating potential well

    图  4  单个振荡势阱下正负电子对数目与时间依赖关系

    Figure  4.  Electron-positron pair number vs time in a single oscillating potential well

    图  5  单个振荡势阱下瞬时束缚态与时间依赖关系

    Figure  5.  Instantaneous bound states vs time in a single oscillating potential well

    图  6  组合势阱下正负电子对的数目与啁啾参数的依赖关

    Figure  6.  Electron-positron number vs the chirp parameter in combined potential wells

    图  7  组合势阱下最优啁啾参数与基频的依赖关系

    Figure  7.  Optimal chirp parameter vs fundamental frequency in combined potential wells

    图  8  组合势阱下正负电子对的数目与基频的依赖关系

    Figure  8.  Electron-positron number vs fundamental frequency in combined potential wells

    图  9  组合势阱下正负电子对的数目随时间的演化

    Figure  9.  Electron-positron number varies with time in combined potential wells

    图  10  组合势阱下产生电子数目的时间空间分布

    Figure  10.  Temporal and spatial distribution of the number of electrons created under combined potential wells

    图  11  组合势阱下产生电子的能谱

    Figure  11.  Energy spectra of electrons created in combined potential wells

    图  12  非线性啁啾下的频谱

    Figure  12.  Frequency spectra under nonlinear chirp

    表  1  单个振荡势阱中最优啁啾参数下与固定频率下产生正负电子对数目的比值

    Table  1.   The ratio of electron-positron number created at the optimal chirp parameter to that at the fixed frequency in a single oscillating potential well

    ω0/c2Rω0/c2R
    0.1 13200 1.0 11.0
    0.2 698 1.2 3.74
    0.4 281 1.5 2.77
    0.5 82.9 1.8 2.80
    0.7 23.0 2.0 1.81
    下载: 导出CSV

    表  2  组合势阱中最优啁啾参数下与固定频率下产生正负电子对数目的比值

    Table  2.   The ratio of electron-positron number created at the optimal chirp parameter to that at the fixed frequency in combined potential wells

    ω0/c2Rω0/c2R
    0.06 1.42 1.0 1.99
    0.1 2.09 1.2 1.54
    0.3 2.22 1.5 1.12
    0.5 2.68 1.8 1.12
    0.7 2.15 2.0 1.00
    下载: 导出CSV
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  • 收稿日期:  2021-03-10
  • 修回日期:  2022-06-13
  • 网络出版日期:  2022-06-21

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