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Influences of Polepiece Optical Parameters Shapes on the Electron of Megnatic Lenses

Shen Yiqi(Department of electronic science & engineering ,Nanjing university ,Nanjing 210093)  
Through the investigations of three type of practical—used magnatic lenses, it is proposed that the influences on their electron optical parameters can be characterized by shape parameter W=(D'_z—D_1)/2S. Under the conditions that the magnatic circutic is resonably designed and the weak magnatic excitation is satisfied, it is shown that, if W0.7, the polepiece shapes have some influence on the electron optical parameters, while if W0.7, the shapes have little influence.
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