Abstract
The effect of the distance between the grounded flat entrance diaphragm and the outer cylindrical electrode (which determines the edge field of the lens) is investigated over a wide range of variation of the geometry of a coaxial cylindrical lens. It is found that focusing of a charged particle beam on the lens axis is achieved over a wide range only in the case of small clearances between the diaphragm and the outer electrode. It is shown that for an alternative power feed arrangement, in which the outer cylindrical electrode is grounded and the voltage is applied to the inner electrode, beam focusing is in general degraded, in particular on the lens axis.
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L. P. Ovsyannikova and T. Ya. Fishkova, Pis’ma Zh. Tekh. Fiz. 22(16), 39 (1996) [Tech. Phys. Lett. 22, 660 (1996)].
L. P. Ovsyannikova and T. Ya. Fishkova, Zh. Tekh. Fiz. 67(8), 89 (1997) [Tech. Phys. 42, 935 (1997)].
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Zh. Tekh. Fiz. 68, 124–127 (June 1998)
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Ovsyannikova, L.P., Fishkova, T.Y. Influence of the edge field on the focusing properties of a coaxial cylindrical lens. Tech. Phys. 43, 726–729 (1998). https://doi.org/10.1134/1.1259061
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DOI: https://doi.org/10.1134/1.1259061