Abstract
The total energy distribution (TED) and reduced brightness from the ZrO∕W(100) Schottky electron source are extended to positions 4.4° off of the optical axis of the emitter. The faceted nature of the stable end form precludes a monotonic variation in emission properties with the beam angle. Both the full width at half maximum of the TED and the reduced brightness of the source increase by 37% and 18%, respectively, at an off-axis beam angle, consistent with the facet edge of the emitting (100) plane and at a constant current angular density of 0.5mA∕sr and 1800K source temperature. Similarly, the angular magnification and work function increase by 27% and 6%, respectively, as the beam angle increases from 0° to the facet edge at 4.4°.
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