Study on secondary electron suppression in compact D-D neutron generator
Study on secondary electron suppression in compact D-D neutron generator
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紧凑型D-D中子发生器二次电子抑制研究
DOI：
10.1007/s41365-019-0596-0
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发表时间：
2019-05-01
影响因子：
2.8
通讯作者：
Yao, Ze-En
中科院分区：
文献类型：
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作者：
Huang, Zhi-Wu;Bai, Xiao-Hou;Yao, Ze-En
兰州大学正在研制一台小型D-D中子发生器，其D-D反应的中子产额峰值可达2.48 × 10（8）n/s，可用于实时中子活化分析。在试验过程中，遇到了氘离子轰击中子产生靶释放的二次电子的反加速问题。本研究设计并实验研究了电场法和磁场法抑制二次电子的方法。实验结果表明，电场法比磁场法有上级的优越性。当靶与引出加速电极之间的偏压大于204 V时，通过静电抑制可以有效地抑制二次电子。此外，还估算了混合氘离子（D-1（+）、D-2（+）和D-3（+））撞击钼的二次电子发射系数。在80- 120 keV的氘能量范围内，混合氘离子掠入射45 °时的二次电子发射系数约为5-5.5，垂直入射时的二次电子发射系数约为3.5-3.9。
A compact D-D neutron generator, with a peak neutron yield of D-D reactions up to 2.48x10(8)n/s is being developed at Lanzhou University in China for application in real-time neutron activation analysis. During tests, the problem of back acceleration of secondary electrons liberated from the neutron production target by deuterium ions bombardment was encountered. In this study, an electric field method and a magnetic field method for suppressing secondary electrons are designed and experimentally investigated. The experimental results show that the electric field method is superior to the magnetic field method. Effective suppression of the secondary electrons can be achieved via electrostatic suppression when the bias voltage between the target and the extraction-accelerating electrode is >204V. Furthermore, the secondary electron emission coefficient for the mixed deuterium ion (D-1(+), D-2(+), and D-3(+)) impacting on molybdenum is estimated. In the deuterium energy range of 80-120keV, the estimated secondary electron emission coefficients are approximately 5-5.5 for the mixed deuterium ion glancing incidence of 45 degrees and approximately 3.5-3.9 for the mixed deuterium ion normal incidence.