First observation of elliptical sheet beam formation with an asymmetric solenoid lens

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Abstract

Currently ongoing at Los Alamos National Laboratory is a program to develop high-power, planar 100-300 GHz traveling-wave tubes. A necessary part of this effort is a sheet electron beam source. Previously, we have described a novel asymmetric solenoid lens concept for transforming the circular beam from a high-perveance electron gun to a planar configuration. The lens is a standard electromagnetic solenoid with elliptical, instead of circular, pole apertures. The elliptical pole openings result in asymmetric focusing, which in turn forms an elliptical sheet beam suitable for our planar structures. Here we report the first experimental demonstration of this lens.

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Russell, S. J., Wang, Z. F., Haynes, W. B., Wheat, R. M., Carlsten, B. E., Earley, L. M., … Ferguson, P. (2005). First observation of elliptical sheet beam formation with an asymmetric solenoid lens. Physical Review Special Topics - Accelerators and Beams, 8(8), 1–8. https://doi.org/10.1103/PhysRevSTAB.8.080401

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