六、RAYTRACE计算方法由于磁谱仪光学系统具有相当大的相空间体积,且由于运动学效应,传输过程中相空间体积不守恒,近轴光学方法已不适用。RAYTRACE方法就是用数值方法求解一束具有物理特征参数的射线在特定磁场中的运动方程,而用这组射线的轨迹在系统空间中的交越 VI. RAYTRACE CALCULATION METHOD Since the magnetic spectrometer optical system has a considerable phase space volume, and because of the kinematic effect, the volume of phase space in the transmission is not conservative, the paraxial optical method is not applicable. The RAYTRACE method numerically solves the equations of motion of a ray of rays with a certain physical characteristic in a particular magnetic field. The crossover of the trajectory of this ray in the system space