DD neutron yield diagnosis by indium activation
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摘要: 提出了活化法测量DD中子产额的实验方法，该方法可提高DD中子产额测量的精度。方法基于铟同位素115In与DD中子的非弹性散射反应，活化反应释放的射线被HPGe探测器记录，根据活化系统标定灵敏度推算出中子产额。分析了探测器记录的活化射线数与中子产额间的关系。介绍了一套活化测量的系统设计。通过蒙特卡罗方法模拟了活化样品出射的射线数与样品厚度的关系，模拟结果表明：样品厚度取为1 cm可兼顾活化效率和测量精度。在加速器上对铟活化样品进行了标定实验，实验结果表明：在聚变中子产额大于2109的实验中可使用铟活化诊断方法，中子产额测量的相对标准误差在10%以内。随着聚变中子产额的不断提高，铟活化测量中子产额的精度可进一步提高。Abstract: The measurement of DD neutron yield by activation is presented. This method is based on the inelastic scattering reaction of 115In with DD neutron, and the activated spectrum is counted by HPGe detector. The relation between the counts of detected rays and the neutron yield is analyzed. The optimal thickness of sample is given by Monte Carlo simulation, which is 1 cm. The entire counting system has been calibrated on the K-400 accelerator. The result shows that the DD neutron measurement by indium activation can be used in the ICF experiment when the neutron yield is above 2109. The total error of the system is below 10% in this condition. The total error will reduce when the neutron yield is larger.
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Key words:
- dd neutron yield /
- indium activation /
- experimental calibration /
- monte carlo simulation
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