ELD is a suite of programs for the computation of the potential distribution in axially symmetric electrostatic lenses and for the computation of their electron optical properties. The program package contains four programs. It allows graphical editing of the mesh, specification of the distribution of electrodes, which can be either thick or thin, fine mesh generation by an automeshing procedure and graphical modification of the fine mesh.
Input is done with clearly arranged menus.
Results can be output in HPGL format to a plotter or into a file. The computation is performed either for fixed electrode potentials or for unit potential on each electrode in turn. The results of trajectory computations can be displayed graphically with the help of an auxiliary program SGPlot. Fortran 77 for computational programs, Borland Pascal for interface. Ready for distribution, documented.