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Dispenser cathodes must operate at specific temperature while applying specific heater power. To achieve the required temperature a wire coil heater is commonly used. During the heater and cathode design process several aspects (structure rigidness, heat transfer path, uniformity of surface temperature distribution, heater and cathode life) have to be taken under consideration which makes the design...
The advantages of argon-ion-irradiated reticulated vitreous carbon (RVC) as a cold-cathode electron source are investigated in the context of a high current density, medium energy, low energy spread, high brightness electron gun.
An electrostatic- focused electron source with an Ar+-ion irradiated reticulated vitreous carbon (RVC) field-emission cathode is designed and simulated. The electron beam from a 1 mm emissive surface is focused to a 30 μm diameter spot, retaining low energy spread and high brightness, yet high total current, for application to phase-contrast x-ray imaging.
Summary form only given. The ubiquitous CRT is finally being overtaken in terms of volume production by flat panel technologies, predominantly based on liquid crystals. It has taken over 30 years for the first LCD based displays to be established, and, at present, to dominate the market. Field emission (FE) based displays are currently at a turning point in establishing a toehold in the hugely competitive...
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