Abstract
Owing to their increased dispersion, mass separators with inhomogeneous magnetic fields may be useful for the production of highly enriched. As suggested by Boerboom and Tasman the required inhomogeneity may be obtained with conically shaped pole faces. These authors have shown that a tenfold increase in resolution, compared with a homogeneous field of the same mean raidu may be achieved. Their analytical tretment, however, only allows the calculation of aberrations for ions which travel along the mean radius. For simulataneous colection of more isotopes it would be important to know how the quality of focus varies with increasing distance from the mean radius. In this paper a numerical is described allows a threedimensional ray-tracing through inhomogeneous magnetic sector fields. For several cases (one being the case of stigmatic focussing of the second order) the curve of direction focussing as well as the image shape along this curve is calculated 9).
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