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- W4247446906 abstract "Numerical calculations have been conducted on the electron optical characteristics of the accelerating tube (AT) for the high voltage electron microscope (HVEM) equipped with the field emission gun (FEG). The emitted electrons are firstly accelerated to V0 by the FEG and finally to Va by the AT which consists of 34 stages of accelerating electrodes with an inner diameter of 33 mm and has an overall length of 1423 mm. The AT is treated as a thick electrostatic accelerating lens. Several electron optical problems arising from a combination of the AT with the FEG are studied. In order to reduce an unfavorable aberration effect of the AT-lens, the beam crossover must be brought to a position near the entrance plane of the AT. This can be done by a transfer lens which is placed between the FEG and the AT. The introduction of a partial retarding field in the AT is also very effective for a flexible operation of the FEG system without serious aberration effects of the AT-lens." @default.
- W4247446906 created "2022-05-12" @default.
- W4247446906 date "1978-01-01" @default.
- W4247446906 modified "2023-09-26" @default.
- W4247446906 title "Conclusions of the analytical electron microscopy workshop" @default.
- W4247446906 doi "https://doi.org/10.1016/s0304-3991(78)80071-0" @default.
- W4247446906 hasPublicationYear "1978" @default.
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