真空电子技术Issue(5)：56-66,11.DOI:10.16540/j.cnki.cn11-2485/tn.2025.05.10
多栅极碳纳米管场致发射离子源结构设计与仿真
Structural Design and Simulation of Multi-gate Carbon Nanotube Field-induced Emission Ion Source
摘要
Abstract
To meet the demand for high-performance ion sources in specific application scenarios of neutron tubes,the aim is to design and develop a deuterium ion source with compact structure and excellent performance.A cylindrical symmetrical deuterium ion source based on electron collision ionization mechanism is designed by adop-ting carbon nanotube cold cathode and a composite structure of multi-gate and permanent magnet ring.Through the electromagnetic particle simulation software VSim,the electric field distribution,magnetic field constraint and parti-cle collision dynamics process within the ion source are systematically analyzed.The key parameters such as the second gate voltage and the position of the magnetic ring are optimized with emphasis.The research shows that un-der the simulation conditions of a gas pressure of 0.1 Pa and a cathode emission current of 25 mA,the maximum deuterium ion current of the ion source can reach 162 mA.According to the simulation design structure parameters,the ion source is manufactured.The length of the ion source is 37 mm and the diameter is 21 mm.In actual tests,permanent magnet rings are used to test the ion source.A total ion current of 20 mA is measured with a cathode emission current of 1.5 mA,which is basically consistent with the theoretical calculated value.The main reasons for not achieving the expected performance include the limitations of the processing technology,the deviation of the magnetic ring layout and the insufficient cathode emission performance.Subsequently,improvements will be made by improving the processing technology,optimizing the magnetic ring layout and enhancing the cathode emission performance,so as to provide reliable technical support for the practical applications of neutron tubes.关键词
中子管/电子轰击离子源/场致发射/碳纳米管Key words
Neutron tube/Electrons bombard ion sources/Field-induced emission/Carbon nanotube分类
电子信息工程引用本文复制引用
张潇璠,张鹏程,陈泽祥,王艳..多栅极碳纳米管场致发射离子源结构设计与仿真[J].真空电子技术,2025,(5):56-66,11.基金项目
宜宾市科技计划项目(2024JC015) （2024JC015）
四川省科技计划项目,四川省科技创新合作/港澳台科技创新合作项目(2025YFHZ0238) （2025YFHZ0238）
