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基于太赫兹脉冲加速及扫描电子束的高时间分辨探测器研究

李杭 陈萍 田进寿

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基于太赫兹脉冲加速及扫描电子束的高时间分辨探测器研究

李杭, 陈萍, 田进寿

Research of a THz accelerating and scanning high time resolution detector

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  • 采用太赫兹脉冲加速和扫描电子束可以大幅提高扫描时间探测器的时间分辨能力,克服传统条纹相机阴栅加速电场有限、无法继续降低时间弥散的缺点。本文基于这一新技术设计了一款无聚焦极、超小结构的时间分辨探测器。分别设计并优化了适用于加速区和扫描区的太赫兹脉冲耦合增强装置,太赫兹脉冲电场在该装置中的增强系数分别达到7.03和9.39;从理论上分析了阴栅加速区的时间弥散与电子发射时间点的关系,以及空间电荷效应对时间弥散的影响。利用电子轨迹追踪计算和分析了所设计时间分辨探测器的时间弥散,得到了时间分辨率优于50fs的结果。
    Terahertz pulses accelerating and scanning electrons can break the limitation of accelerating electric field between cathodes and grids in traditional streak tubes, thus reduce the time dispersion and enhance temporal resolution of time-scanning detectors. Based on this new technology, this paper designs a ultra-small structured time-resolved detector with no focusing pole. The terahertz pulse coupling/enhancing device suitable for acceleration zone and scanning zone is designed and optimized. The enhancement coefficient of the terahertz pulse electric field in the device reaches 7.03 and 9.39. The paper theoretically analyzes the relationship between time dispersion in acceleration zone and the moment of electrons emission. We also analyze the influence of space charge effect on time dispersion. The electronic trajectory tracking is used to calculate and analyze the time dispersion of this detector, and finally the time resolution is better than 50fs.
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  • 文章访问数:  1820
  • PDF下载量:  11
  • 被引次数: 0
出版历程
  • 收稿日期:  2021-05-08
  • 上网日期:  2021-10-11

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