| 液体闪烁体探测器测量皮秒激光脉冲中子源能谱 |
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| 引用本文： | 崔波,贺书凯,刘红杰,戴曾海,闫永宏,卢峰,李纲,张发强,洪伟,谷渝秋.液体闪烁体探测器测量皮秒激光脉冲中子源能谱[J].强激光与粒子束,2016,28(12):124005. |
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| 作者姓名： | 崔波 贺书凯 刘红杰 戴曾海 闫永宏 卢峰 李纲 张发强 洪伟 谷渝秋 |
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| 作者单位： | 1.中国工程物理研究院 激光聚变研究中心,等离子体物理重点实验室, 四川 绵阳 621 900 |
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| 摘 要： | 在星光Ⅲ实验装置上开展皮秒激光脉冲中子源实验，使用液体闪烁体探测器测得较好的中子信号，利用飞行时间法获得中子的能量/时间分布，通过示波器电压时间积分与阻抗之比得到不同能量段的电荷值。建立液体闪烁体探测器Geant4计算模型，通过实际打靶情况与标定情况下液体闪烁体探测器出光口收集到的可见光光子数之比，结合标定的灵敏度数据，获得液体闪烁体探测器对不同能量中子的灵敏度。计算得到源发射的中子能谱，能量在1 MeV以上的液体闪烁体探测器方向测得的中子产额为1.04108 sr-1。
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| 关 键 词： | 激光脉冲中子源 液体闪烁体探测器 飞行时间 发光响应 中子灵敏度 中子能谱 |
| 收稿时间： | 2016-07-22 |
Neutron spectrum measurement for picosecond laser pulse neutron source experiment with liquid scintillator detector |
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| Affiliation: | 1.Science and Technology on Plasma Physics Laboratory,Research Center of Laser Fusion,CAEP,P.O.Box 919-986,Mianyang 621900,China |
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| Abstract: | The picosecond laser pulse neutron source experiment was demonstrated on Xingguang-Ⅲ facility. A good neutron signal was measured by liquid scintillator detector. The neutron energy distribution with time was obtained by time-of-flight method, and the charge between different energy intervals was acquired by the ratio of the integral of oscilloscope voltage and time to oscillator input resistance. Geant4 calculation model for liquid scintillator detector under experimental and calibration cases were established, and the neutron sensitivity was obtained by the ratio of the collected optical photons. Neutron energy spectrum for picosecond laser pulse neutron source was calculated, and the neutron yield below 1 MeV in the direction of liquid scintillator detector was 1.04108 sr-1. |
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