An approximate solution of the paraxialrayequation for cylindrical dense electron beams was obtained by means of the Taylor expansion.
本文提出圆柱形强流电子束的傍轴轨迹方程，可以用台劳展开求出它的近似解。
2
It is proved in a complicated optical system that the diffraction integration in terms of ray matrix element is the right solution 'for paraxialequation.
对复杂光学系统证明了光线矩阵元表达的衍射积分是旁轴波动方程的准确解。
3
The cathode of the gun may be partially shielded magnetically. The paraxial-rayequation for describing the electron trajectory in the accelerating region is solved in closed form.