摘要
长磁透镜是展宽型分幅相机的重要部件,使用大电流激励长磁透镜可在漂移区产生强磁场,从而提高相机空间分辨率.由于焦耳热效应的影响,长磁透镜无法长时间工作在大电流环境下.本研究基于串并联Marx结构,设计了应用于长磁透镜的电流脉冲发生器,研究了充电电压、储能电容、负载以及电路串、并联级数对输出电流脉冲的影响.当充电电压增大,储能电容值增大,负载减小,串联级数增加时,脉冲峰值电流增大;并联级数增加时,峰值电流呈先增后减的变化趋势.当储能电容值增大,负载增大,串联级数减少,并联级数增加时,脉冲半高宽增大.建立长磁透镜模型,模拟了长磁透镜轴上磁场强度分布.长磁透镜内径越大,轴上磁感应强度越弱;激励电流越大,磁感应强度越强.采用四级串联、两路并联的Marx脉冲电路产生了峰值457 A,半高宽6.76 ms的电流脉冲.该电流脉冲激励长磁透镜,获得了53.72μm的空间分辨率.
The long magnetic lens is an important part of the dilation framing camera.It can generate a strong magnetic field in the drift region when stimulated by large current,thus improving the spatial resolution of the camera.Due to the joule heat effect,the long magnetic lens cannot work in large current environment for a long time.In this study,the current pulse generator applied to the long magnetic lens is designed based on the series and parallel Marx structure.The effects of charging voltage,energy-storage capacitance,load,circuit series and parallel stages on the output current pulse are studied.While the charging voltage and energy-storage capacitance increases,the pulse peak current becomes larger.The same is true when the number of series stages is increased or the load decreases.When the number of parallel stages increases,the peak current increases at first and then decreases.In addition,the pulse width is larger by increasing the energystorage capacitance,the load,and the number of parallel stages.When the number of series stages increases,the pulse width decreases.A long magnetic lens model is established to simulate the magnetic field intensity distribution on the axis.The larger the inner diameter of the long magnetic lens,the weaker the magnetic induction intensity.The greater the excitation current,the stronger the magnetic induction intensity.A pulse with peak current of 457 A and full width at half maximum of 6.76 ms is generated by Marx pulse circuit with four stages in series and two in parallel.The current pulse excites the long magnetic lens,and the spatial resolution of 53.72μm is obtained.
作者
林楷宣
罗秋燕
陈嘉杰
王佳恒
黄峻堃
王东
刘进元
牛丽红
蔡厚智
LIN Kai-xuan;LUO Qiu-yan;CHEN Jia-jie;WANG Jia-heng;HUANG Jun-kun;WANG Dong;LIU Jin-yuan;NIU Li-hong;CAI Hou-zhi(Key Laboratory of Optoelectronic Devices and Systems of Minitry of Education and Guangdong Province,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen,Guangdong 518060,China)
出处
《电子学报》
EI
CAS
CSCD
北大核心
2024年第5期1469-1477,共9页
Acta Electronica Sinica
基金
国家自然科学基金(No.11775147)
广东省基础与应用基础研究基金(No.2019A1515011474,No.2019A1515110130)
深圳市科技计划项目(No.JCYJ20210324095007020,No.JCYJ20200109105201936,No.JCYJ20190808115605501)。
