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- W2012877281 abstract "In this paper the theoretical description of limited area thermionic cathodes for use in electron microscopes and related equipment is presented. With these cathodes the emitting area is set by the extent of the active cathode surface and not by a control electrode, as is the case for the conventional triode electron microscope gun. This allows the accelerating field at the cathode surface to be greatly increased and the deleterious effects of space charge eliminated. The field can also be increased to the point that the Schottky effect enhances emission without the need to use sharply pointed cathodes. For example, considerable Schottky enhancement can be realized for cathodes with tip radii around 50 μm. The overall effect is that brightness can be increased by more than an order of magnitude over the standard triode gun. Other advantages are that the total beam current can be much higher than it is with field-emission and thermal field-emission cathodes and that the Boersch effect is reduced because no real crossover is formed." @default.
- W2012877281 created "2016-06-24" @default.
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- W2012877281 date "1991-11-01" @default.
- W2012877281 modified "2023-09-26" @default.
- W2012877281 title "High brightness limited area cathodes" @default.
- W2012877281 doi "https://doi.org/10.1116/1.585628" @default.
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