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Electron emission characteristics of a triode surface-conduction field emission display were simulated with finite element analysis method and MATLAB. The parameters of the display structure were optimized based on the simulation results. Field emission from the carbon nanotubes and ZnO nanotetrapod compound cathodes were also simulated and studied.
This paper presents theory and analysis of single-tip field emission and electron beam propagation in the electrostatic focusing fields. It is shown that two gate apertures with a focusing anode allow transport of narrow electron beams over long distances without need for a confining magnetic field. Physical mechanisms of the beam formation, transport, intrinsic emittance with thermal effects, the...
Diversified Technologies, Inc. (DTI), under an SBIR grant from the U.S. Department of Energy, assembled a prototype pulse generator capable of meeting the original specifications for the Next Generation Light Source (NGLS) fast deflector. The ultimate NGLS kicker driver must drive a 50 Ω load (a 50 Ω terminated Transverse Electromagnetic (TEM) deflector blade) at 10 kV, with flat-topped pulses according...
Under a U.S. Department of Energy grant, Diversified Technologies, Inc. (DTI) is developing a short pulse, solid-state Marx modulator (Figure 1). The modulator is designed for high efficiency in the 100 kV to 500 kV range, for currents up to 500 A, pulse lengths of 0.2 to 5.0 μs, and risetimes <300 ns. Key objectives of the development effort are modularity and scalablity, combined with low cost...
Launched in December 2010 KA-SAT represents the first of the current generation of High Throughput Satellites (HTS). With a total system capacity of over 90Gbit/s and the capability of supporting up to a million users, it delivers services akin to those provided by terrestrial ADSL2+. In order to meet increasing demands on capacity, and subsequently on equipment, it is expected that the bandwidth...
A macro-focus X-ray tube with CNT emitters was successfully developed. An anode current of 1.15mA was collected when the copper grid gate voltage was 2.7kV. A very small x-ray focal spot size with less than 39μm can be achieved, which could potentially produce very high special resolution X-ray image.
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