Determination Of The Most Favorable Shapes For The Electrostatic Quadrupole Lens
By using transfer matrices method a computation has been carried out on the axial field distribution and the optical properties of the electrostatic quadrupole lens of different electrode shapes such as, cylindrical convex and spherical electrodes.The path of charged–particles beam traversing the field model has been determined by solving the trajectory equation of motion in Cartesian coordinates. The optical properties of the electrostatic quadrupole lens have been computed with the aid of the beam trajectory along the lens axis. Optimization