负离子中子管的良率稳定性实验  

Stability Testing of Yields of Negative Ion Neutron Tubes

作　　者：陆杰 周晓华 岳爱忠 闫星泉 刘洋 柴鑫 LU Jie;ZHOU Xiaohua;YUE Aizhong;YAN Xingquan;LIU Yang;CHAI Xin(Xi'an Engineering Research Center of Controllable Source and Equipment,Xi'an AoHua Electronic Instrument Co.,Ltd.,Shaanxi 710100,China.;Shaanxi International Joint Research Center for Applied Technology of Controllable Neutron Source,Xijing University,Shaanxi 710123,China.;Logging Technology Research Institute,China Petroleum Logging Corporation,Shaanxi 710077,China.;Xi'an Guanneng Neutron Detection Technology Co.,Ltd.,Shaanxi 710123,China.)

机构地区：[1]西安奥华电子仪器股份有限公司西安市可控源装备工程技术研究中心,陕西710100 [2]陕西省可控中子源应用技术国际联合研究中心,西京学院,陕西710123 [3]中国石油测井集团有限公司测井技术研究院,陕西710077 [4]西安冠能中子探测技术有限公司,陕西710123

出　　处：《电子技术（上海）》2023年第5期46-48,共3页Electronic Technology

基　　金：中国石油天然气集团有限公司关键核心技术攻关项目(2020B-3714);电子元器件可靠性物理及应用技术重点实验室开放基金项目(ZHD201701)。

摘　　要：阐述正离子中子管存在二次电子发射率高,束流单原子离子比例低的问题。若采用负离子引出则可避免上述问题。设计了一款采用潘宁离子源负离子引出打靶的中子管,在90kV的靶压下,实现了最大16μA的引出束流,中子产额最高达到1.32×108n/s。利用3支中子管分别进行4h的连续打靶,实验表明,开始时产额随打靶时间缓慢上升,在130min左右产额达到最大值,随后开始缓慢下降。整个过程中的中子产额始终稳定在1.15×108n/s以上,理论分析表明其靶流中电子占比约为70%,而氘负离子占比约为30%。This paper explains that positive ion neutron tube has two shortcomings,one is the secondary electrons problem and the other is the low proportion of monatomic ions in extracting beams.These two problems can be avoided by extracting negative ions.In this study,a kind of negative neutron tube with penning ion source was designed.With the target voltage 90kV,the maximal target current and neutron yield attain 16μA and 1.32×108n/s,respectively.Three negative ion tubes were tested and each one worked about 4 hours continuously.The results show that the target current will increase slowly at the begin of shorting time.The maximal target current occurs when shorting time reach to 130 minuets.Then,it will decrease slowly with shorting time increase.In whole process,the target current keeps no less than 1.15×108n/s stably.Theoretical analysis reveals that the proportion of electrons and positive deuterium ions in target current are about 70%and 30%,respectively.

关 键 词：中子管 负离子中子管 离子源 中子产额 

分 类 号：TL503.3[核科学技术—核技术及应用]