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The electric field strength on the emitter surface is the most important parameter because it strongly influences the gun performance. We have found that the electric field strength on the emitter surface can be estimated experimentally from the Schottky plot whose slope depends not on the work function but only on the reciprocal of the emitter temperature.
Atomic-scale pyramids with three {211}-facet sides and a single-atom top were grown on the originally bare W tip ends by using surface diffusion of noble-metal atoms from the rear region of the W tip. In this paper, we used Pt and Au in addition to Pd as the diffusion atoms, and compared the observed structural evolutions. We find that successful growth of the nano-pyramid is possible for all three...
Thermal field emission (TFE) characteristics of single-crystal LaB6 columnar tip were investigated. After adequate cleaning treatment, TFE was continuously stable at 1600 K and 1700 K in 10−8 Pa. Emission patterns indicated that TFE could be regarded as uniform if we took it into account that the size of the emission region practically used for the e-beam lithography was about 0.5 mm on the fluorescence...
We have developed a new method for preparing atomic-scale pyramids with three {211}-facet sides (nanopyramids) applied for single-atom emitters (SAEs). In the present method, atoms were electroplated only on the backward faces of the W tip, and supplied forward via surface diffusion promoted by elevating temperatures to 1000 K in UHV. With additional annealing at the same temperature, the tip end...
The purpose of the present study is to examine the feasibility of a high brightness and high beam current electron gun with an elongated lifetime from perspective of computer simulation. We propose a novel electron gun system with LaB6 cathode which is operated at Schottky emission mode under slightly lower temperature condition than that typically used for thermionic emission mode. The design of...
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