用磁聚焦法测量真空磁导率  

Measuring the magnetic permeability of vacuum with the method of magnetic focusing

作　　者：黄河[1] 马静[1] 刘竹琴[1] 

机构地区：[1]延安大学物理与电子信息学院,延安716000

出　　处：《信息技术》2012年第5期52-54,共3页Information Technology

基　　金：延安大学大学生科技创新项目(D2011-061)

摘　　要：用水平偏转板间电场给电子加速,使电子具有共同的平行于电场场强的速度;将示波管置于载流螺线管的匀强磁场里,电子在磁场中做圆周运动的周期与电子的速度无关,从而可以达到电子束聚焦的效果。利用电子在电场和磁场中受到洛伦兹力的作用和其轨迹的特点,以电子荷质比为已知量,从间接角度出发测量空气磁导率。Accelerating the electrons through the electric field between the two level plates so that the accelerated electrons .have a common speed. Putting the tube of oscilloscope in the even magnetic field produced by a solenoid with current, thus the cycle of the electrons＇ circumferential movement has nothing to do with the velocity of the electrons in the magnetic field, thereby the focusing of electron beam in a tube of oscilloscope happens. This text makes use of the Lorentz force and the character of the electrons＇ track, with the ratio of electronics quantity to mass for known quantity, thus the magnetic permeability of vacuum is measured indirectly.

关 键 词：真空磁导率 磁聚焦法 电子荷质比 

分 类 号：TM933[电气工程—电力电子与电力传动]