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A theoretical comparison of ion optics for transverse slot and cylinders was performed with an algorithm that accurately computes the two-dimensional collisionless sheath. An aberration-dominated optics situation, typical of many neutral injectors used for fusion research, was analyzed. The slot geometry produced a minimum beam rms divergence of 3.1°, while the cylinder geometry produced a divergence of 1.8° (in agreement with experiment). We present evidence to delineate the cause for this effect.
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Whealton et al. (1980) studied this question.
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