电子束在横向磁场下偏移量的修正

为了衡量电子在横向磁场下的偏移量的实验中所测数据的优劣性,分析了电子在横向磁场下的偏移原理,,通过亥姆霍兹线圈全空间磁场的计算和磁场均匀性范围的分析;修正了电子在匀强磁场中偏移距离与磁感应强度的关系式,得到了电子在磁场中的偏移距离与产生匀强磁场的电流以及磁场大小的偏差率之间的关系以及成立的条件.当亥姆霍兹线圈的半径给定时,电子偏移距离与电流满足非线性关系.亥姆霍兹线圈的半径越大,可获得在较小磁场偏差率下的匀强磁场区域越大.通过修正的表达式可更好的判断数据的优劣,估计实验误差的大小.

Displacement Correction of Electron Beam in Transverse Magnetic Field

Based on the analysis of displacement of the electron in transverse magnetic field,computation of magnetic field of Helmholtz coil and the analysis of uniform scope of magnetic field,the expression of the electron displacement with magnetic field intensity in intensitive uniform magnetic field is modified by the authors.The relation ship of the electron displacment with current which brought magnetic field and deviation rate of magnetic field is gotten,also the necessary conditions are given simultaneously.The electron displacement meets non-linear relation when the radius of Helmholtz coil is given.The larger the radius of Helmholtz coil is the large the uniform range of magnetic field will be at smaller magnetic deviation rate.The measurement of experimental data and error estimation can be produced well by use of the corrected expressions.