Image Formation Free Rotation in Triple Pole-Piece Magnetic Lenses

Abstract

Present work is mainly concern with the mathematical function, considered to represent the axial magnetic flux density distributions of proposed triple pole-pieces magnetic lenses which is used as rotation free lenses. This function has, in fact, three-optimization parameters. The only important parameter is the bore radius of the lens in the proposed model. This parameter can be affect on the projector properties of the lens, when the other two optimization parameters (maximum value of flux density and lens length) are constants, where the literature survey proved that unaffected on the lens properties. Results have clearly shown that the optimization parameter for current function, have a considerable effect on the lens distortion, lens magnification, and the reconstructed pole-pieces. Furthermore, the results obviously show the excellent ability for converting the form of the chosen mathematical function in order to represent the magnetic field of triple pole-pieces lenses.

Keywords: Electron Optics, Projector Lens, Distortion, Magnification