Scanning Electron Microscopy


In the present paper, we have further studied an approach to the theoretical treatment of wide electron beam focusing, based on the application of the theory of focusing fields with arbitrary curved optical axis, considering the initial condition emitted from the cathode surface. It is assumed that the magnetic field vector B will be used instead of the magnetic scalar potential Ω and the electrostatic potential πž… and the magnetic field vector B are known functions either by computation or experimentally in the laboratory system of coordinates. The new approach to the mathematical treatment appears to be a useful method for solving problems of wide electron beam focusing with arbitrary electrostatic and magnetic fields.

The theoretical treatment presented here can be extended to solve problems of deflection defocusing in cathode ray tubes at large deflection angles.

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