Trajectory displacement of a single electron in the drift tube |
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Authors: | Katsumi Ura |
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Institution: | 1-14-9 Takakura-cho, Miyakojima-ku, Osaka 534-0011, Japan |
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Abstract: | The positive charge distribution, which is electro-statically induced by a single electron over the inner wall of a drift tube with a constant radius, is analytically calculated. The potential by it is calculated analytically also. The trajectory displacement at image plane of an objective lens, that is, the charge-induced aberration is estimated for two simple lens-models, approximating them electro-statically by a constant radius drift tube. It seems to be less than the diffraction aberration, when the accelerating voltage is higher than 100 V. |
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