Abstract
This paper presents results of simulation for ion extraction from Kaufman type ion source by using CPO 2DS software. For electric potential and field determination the Boundary Element Method (BEM) implemented in CPO 2DS computer program is used. Simulations are made for different accelerator grid shapes. Variations of plasma meniscus shape and the sensitivity of divergence are analyzed in respect to variations of acceleration grid shape by using a finite difference approximation. The objective of the present work is a verification of influence of grid shape variations on beam divergence by numerical experiment. It is shown that a diameter variation of an acceleration grid aperture does not significantly influence on a divergence of ion beam.