A GENERALLIZED COEFFICIENT FORMULA OF THE THIRD ORDER MAGNETIC DEFLECTION ABERRATION AND IT''S RELATIONS WITH THE RASTER PATTERN PRODUCED BY THE IN-LINE GUN
普遍的磁偏转三级象差系数以及它们与PI枪光栅图形的关系

This paper deals with the generalization of the third order aberrations of magnetic deflection to the situation when the electron beam is originally immersed in a magnetic field. The formulae of third order magnetic deflection aberration coefficients in an arbitrary plane have been derived. The formulae are simplified and hence easy for calculation. These aberration coefficients have been applied to analyse the raster patterns produced by the in-line guns.