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We propose an advanced active current-control (ACC) unit composed of two cascade transistors for extremely stabilizing field emission currents. The upper transistor connected to the cathode modulates high voltages for field emission while the other one regulates emission current stably. Using the ACC unit developed, very stable emission currents were achieved from the fully vacuum-sealed x-ray tube...
The goal of this research is to develop an instant turn-on X-ray tube with high speed response. The tube is expected to produce a micro-spot less than 0.5mm at a voltage of 40kV and a current of 1mA. By CST simulation, the X-ray tube based on gate controlled carbon nanotube cathode was designed. Preliminary researches were carried out on carbon nanotube cathode fabrication, metal mesh electrode machining,...
The advanced active-current control with a push-up voltage source is proposed for the fast operation of a carbon nanotube (CNT) field-emission X-ray tube while maintaining the advantages of improved stability and reliability. The push-up voltage source, composed of a resistor and a voltage supply, was found to reduce the response time of CNT X-ray tubes down to sub-microsecond.
We have designed and fabricated a highperformance carbon nanotube (CNT) field emitter for a vacuum-sealed X-ray tube by a brazing process. The developed high-temperature endurable CNT emitters were vacuum-sealed in the diode and triode configurations, showing little degradation upon the brazing process and a good cold cathode of X-ray tube.
Carbon nanotubes (i.e., CNTs) are tubular carbon molecules with properties that make them potentially useful in extremely small scale electronic and mechanical applications. Because of this, CNTs are widely used in many parts such as, field emission display (FED), nanoscale sensors, vacuum electronic devices, and so on. In this study, CNTs were applied for an X-ray emitter. CNTs were grown on the...
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