Investigation of the focal and zoom properties for three-element cylindrical electrostatic lens

الملخص EN

In the present work, the focal properties of electrostatic lens consist of three cylindrical electrodes were intensively investigated.

Each electrode spaced of (0.1) diameter apart.

Special case such as a zoom lens is considered and the results are obtained as a function of the final-to-initial voltage ratios.

It is found that the three-element lens could be operated with the whole focus properties in a useful mode.

The calculations are carried out by using the LENSYS software package.