College of Science

     A computational investigation has been carried out in the field of charged-particle optics. The work is concerned with the design of electrostatic lenses with and without misalignment effect operated under different magnification conditions.The potential field distributions of einzel and immersion electrostatic lenses have been represented by analytic functions. The paraxial ray equation has been solved for the proposed fields to determine the trajectory of the charged particles traversing each lens.

        The Monte Carlo simulation method has been applied to generate the first data for bremsstrahlung buildup factor (BBUF) produced by the complete absorption of beta particles in different materials. The bremsstrahlung buildup factor was computed by the present method for different thicknesses of water, concrete, aluminum, tin and lead at the maximum bremsstrahlung energy of 2.2 MeV for ⁹⁰Sr/⁹⁰Y beta source.

         A computational investigation has been carried out in some properties of Gabor lens with the aid of personal computer under the absence of space-charge effects.  This work has been concentrated on designing two concentric, electrostatic and magnetic lenses.  Electrostatic lens is a two-electrode immersion lens whose electrodes are cylindrical in shape separated by a separation distance.  Magnetic lens is a number of turns of the current-carrying coil of a hypothetical rectangular field of length L.The variable parameters of the electrostatic lens are th